Construction & Building Trades
Material takeoffs, structural checks and code compliance for contractors and serious DIYers — concrete, framing, roofing, plumbing, HVAC, firestop and finish work in one place.
Everything a contractor or serious DIYer measures before buying material. Concrete volume and rebar spacing, stud and rafter layout, roof pitch and shingle squares, pipe sizing and fixture units, duct and HVAC load, insulation R-value, and the estimating maths that turns all of it into a bid.
Firestop work lives here too. Through-penetration firestop systems, annular space and fill ratios, fire barrier and fire-rated assembly ratings, and joint systems are all sized on this hub — a fire barrier penetration is a construction detail, not an afterthought, and it is priced like one.
Acoustics is treated as a building-envelope problem: STC and IIC ratings, partition assemblies, and HVAC noise sit alongside insulation and glazing because that is how they are specified. Consumer painting stays here as well — paint coverage and room paint quantities — while the industrial coatings cluster moved to Manufacturing.
414 calculators in 9 sections.
Start with these
The questions people most often bring to this page, and the calculator that answers each one.
- STC Rating Calculator — Sound Transmission Class for a wall or floor assembly, and what changes it.
- Soundproofing Material Calculator — Transmission loss from mass, air gap and decoupling before you buy material.
- Water Pipe Sizing Calculator — Water supply pipe size from fixture units, length and available pressure.
- Manual J Heat Load Calculator — Room-by-room heating and cooling load, the Manual J way.
- Precast Wall Panel Weight Calculator — Panel weight for lifting, rigging and transport planning.
Matches are ranked by relevance. Use CtrlK anytime to search the full site.
Concrete, Masonry & Structure
Volume, mix, rebar, formwork, block, steel and timber framing.
Concrete Curing Calculator
Estimate concrete curing time to reach target strength based on cement type and ambient temperature using ACI 209 and Nurse-Saul maturity.
Concrete Pumping Calculator
Select the right concrete pump type and estimate pumping time, cost, and boom reach based on pour volume and distance.
Concrete Strength Calculator
Estimate concrete compressive strength using Abrams' law and ACI 209 maturity model with temperature correction.
Concrete Temperature Calculator
Calculate fresh concrete temperature from ingredient temperatures using the ACI 305/306 formula. Assess hot/cold weather risks and ice requirements.
Fiber Reinforcement Calculator
Calculate fiber reinforcement quantities and costs for concrete including synthetic micro, steel, and macro fibers. Compare to welded wire fabric.
Pervious Concrete Calculator
Calculate pervious concrete volume, infiltration rate, stormwater storage capacity, and runoff reduction compared to impervious surfaces.
Post-Tensioning Calculator
Calculate post-tensioning tendon counts, spacing, elongation, and strand weight for concrete slabs.
Rebar Weight Calculator
Calculate rebar weight by bar size, length, and quantity using ASTM A615 standard weights per foot.
Shotcrete Volume Calculator
Calculate shotcrete volume needed including rebound waste, overspray, weight, and application time estimates.
Stamped Concrete Cost Calculator
Estimate stamped concrete costs by pattern complexity, colors, and sealer coats. Compare to pavers and plain concrete.
Stamped Concrete Pattern Calculator
Estimate materials, labor, and total cost for stamped concrete based on area, pattern complexity, and color count.
Acid Stain Calculator
Calculate acid stain concentrate, dilution water, neutralizer, and sealer quantities for decorative concrete staining.
Concrete Countertop Calculator
Estimate concrete mix, reinforcement, mold materials, and sealer for casting decorative concrete countertops.
Exposed Aggregate Calculator
Calculate retarder, sealer, decorative aggregate, and concrete for exposed aggregate finishes.
Concrete Overlay Calculator
Calculate overlay material bags, primer, sealer, and water for decorative concrete resurfacing by area and thickness.
Polished Concrete Cost Calculator
Estimate per-square-foot cost for polished concrete floors based on exposure level, polish grade, and optional dye/stain guard.
Concrete Engraving Calculator
Estimate time, diamond blade usage, coloring materials, and cost for decorative concrete engraving projects.
Integral Color Calculator
Calculate iron-oxide pigment weight for integrally colored concrete based on volume, mix design, and color intensity.
Concrete Sealer Calculator
Calculate sealer gallons, cost, and recoat schedule based on sealer type, surface texture, and number of coats.
Vertical Concrete Mix Calculator
Calculate mix materials for vertical overlays, carved rock, and sculpted concrete facades including lath, polymer, and fibers.
Precast Wall Panel Weight Calculator
Calculate wall panel weight from dimensions, concrete density, reveals, insulation, and openings.
Lifting Insert Design Calculator
Determine lifting insert count, capacity, crane size, and verify minimum stripping strength (2,500 psi) for precast panels.
Erection Sequence Calculator
Plan precast erection: estimate crane picks per day, total erection days, crew size, and project cost.
Connection Hardware Calculator
Design precast-to-structure connections — determine count, capacity, and spacing from panel weight and lateral loads.
Precast Joint Sealant Calculator
Calculate sealant volume, cartridges, backer rod, and cost for sealing joints between precast concrete panels.
Hollowcore Plank Selection Calculator
Select the optimal hollowcore plank depth from span and loading requirements using PCI load/span tables.
Double Tee Selection Calculator
Select the optimal PCI double-tee depth from clear span and superimposed load using industry load/span tables.
Precast Stair Design Calculator
Calculate precast stair dimensions, riser/tread count, stringer length, and weight from floor-to-floor height per IBC code.
Architectural Precast Cost Calculator
Estimate per-SF and total cost for architectural precast based on finish, reveals, color, panel size, and project scope.
Precast Transportation Calculator
Calculate truck loads, trips, delivery schedule, and cost to haul precast elements from plant to jobsite.
Wall Form Pressure Calculator
Lateral concrete pressure from pour rate and temperature per ACI 347R.
Form Tie Spacing Calculator
Calculate form tie spacing from concrete lateral pressure and tie safe working load.
Shore Tower Design Calculator
Calculate shore post spacing and load from slab thickness and shore capacity.
Flying Form Design Calculator
Calculate table form dimensions, weight, crane requirements, and cycle time.
Slip Form Calculator
Calculate slip form rate of rise, concrete volume per hour, and project duration.
Column Form Calculator
Calculate column form plywood area, clamp spacing, and concrete volume.
Gang Form Panel Calculator
Calculate gang form panel weight, crane pick load, and cost per use.
Form Stripping Time Calculator
Estimate minimum form removal time based on concrete strength gain and temperature.
Architectural Form Liner Calculator
Calculate form liner quantity, cost, and release agent for architectural concrete finishes.
Reshoring Calculator
Calculate reshore spacing and loads for multi-story concrete construction.
Brick Quantity Calculator
Calculate the number of bricks and mortar needed for a wall based on dimensions, brick size, and mortar joint width.
Mortar Mix Calculator
Calculate cement, lime, and sand quantities for Type M, S, N, or O mortar based on the volume needed.
CMU Wall Design Calculator
Calculate concrete masonry unit (CMU) block count, rebar, grout, and mortar for a block wall.
Brick Arch Calculator
Calculate the radius, voussoir count, skewback angle, and arc length for segmental and semicircular brick arches.
Stone Veneer Coverage Calculator
Calculate the number of flat and corner stone veneer boxes needed based on wall area and corner linear footage.
Fireplace & Chimney Calculator
Size a chimney flue based on the 10:1 fireplace-to-flue area ratio and estimate draft pressure.
Paver Patio Calculator
Calculate paver count, base material, sand, and edge restraint for a patio with running bond, herringbone, or basketweave patterns.
Retaining Wall Block Calculator
Calculate the number of retaining wall blocks, cap units, backfill, and geogrid for a segmental retaining wall.
Tuckpointing Cost Calculator
Estimate tuckpointing costs including mortar, labor hours, and material for repointing brick joints.
Masonry Lintel Calculator
Calculate loads, required moment, steel angle size, bearing length, and deflection for a masonry lintel over an opening.
CMU Block Count
Stretcher face area with 5% waste; rough mortar bags.
Steel Takeoff Calculator
Calculate total steel tonnage from beam and column counts, weights, and lengths for quantity takeoff estimates.
Moment Connection Design Calculator
Check bolted moment connection capacity per AISC including bolt shear, required bolt count, end plate thickness, and pass/fail adequacy.
Steel Joist Selection Calculator
Estimate loading and deflection-stiffness requirements for SJI K-Series/LH-Series steel joist selection, including a preliminary designation match to cross-reference -- not a final selection -- based on span, tributary width, and loading conditions.
Metal Deck Calculator
Calculate metal deck sheet count, shear studs, pour stop, and material weight for composite or roof deck installations.
Structural Steel Cost Calculator
Estimate total installed structural steel cost including material, fabrication, erection, connections, and miscellaneous metals.
Steel Erection Sequence Calculator
Plan steel erection duration, crane picks per day, crew sizing, and crane utilization based on tonnage, piece count, and pick distance -- and flag pieces that exceed crane capacity.
Fireproofing Calculator
Calculate spray-applied fireproofing material volume, weight, bag count, and cost for cementitious or fiber-type SFRM applications.
Steel Surface Prep Calculator
Calculate abrasive media, primer quantities, labor hours, and cost for steel surface preparation and coating per SSPC standards.
Miscellaneous Metals Calculator
Estimate miscellaneous metals tonnage and cost for handrails, stairs, embed plates, and loose lintels in steel construction projects.
Steel Shop Drawing Checker Calculator
Estimate shop drawing review hours, complexity score, turnaround time, and recommended checker level based on piece count and project details.
Timber Frame Design Calculator
Beam sizing from span, load, and wood species using NDS bending and deflection checks.
Mortise and Tenon Calculator
Joint dimensions, peg sizing, and shear capacity from timber size and load using traditional timber framing rules.
Raising Day Planning Calculator
Crew size, equipment needs, and schedule for a timber frame raising day.
Timber Volume Calculator
Board feet, cubic volume, and weight from timber dimensions and species.
SIP Panel Calculator
Structural insulated panel count, R-value, and cost from wall/roof dimensions and panel thickness.
Post and Beam Layout Calculator
Post spacing, post count, beam quantities, and post load capacity for rectangular post-and-beam structures.
Timber Truss Design Calculator
King-post truss member forces, rafter sizing, and bottom chord tension from span, rise, and loading.
Timber Grade Selection Calculator
Compare 9 species/grade combinations for a beam application with bending and deflection checks.
Timber Connector Design Calculator
Bolt count, spacing, and capacity for timber connections using NDS lateral design values.
Log Home Calculator
Log count, volume, weight, and chinking needs from building dimensions and log profile.
Rammed Earth Wall Calculator
Form count and soil volume from wall dimensions.
Adobe Brick Calculator
Brick count from wall dimensions and brick size.
Cob Building Calculator
Clay, sand, and straw volumes for cob construction.
Straw Bale Wall Calculator
Bale count from wall dimensions and bale orientation.
Earthbag Calculator
Bag count and fill material from wall dimensions.
Compressed Earth Block Calculator
CEB machine output and block count from wall area.
Natural Plaster Calculator
Lime, clay, or earthen plaster volume from wall area.
Living Roof (Earthen) Calculator
Soil, drainage, and structural load estimates for earthen (green) roof systems.
Passive Solar Design Calculator
Thermal mass and window sizing for passive solar earthen buildings.
Earthen Floor Calculator
Poured earth floor material from area and thickness.
Roofing, Facade & Weatherproofing
Roof area and pitch, cladding, curtain wall, glazing and insulation.
Flat Roof Drainage Calculator
Size drains and scuppers for flat roofs based on roof area and rainfall intensity, and check whether your roof slope meets the minimum for positive drainage.
Gutter Guard Calculator
Calculate how much gutter guard material you need, including corner pieces, end caps, and total estimated cost.
Ice Dam Prevention Calculator
Calculate the insulation R-value and ventilation needed to prevent ice dams based on your climate zone and current insulation.
Metal Roofing Calculator
Calculate the number of metal roofing panels, ridge cap, and total square footage needed for your roof.
Roof Coating Calculator
Calculate gallons of roof coating and primer needed based on roof area, coating type, and number of coats.
Roof Replacement Timeline Calculator
Estimate when your roof will need replacement based on material, climate zone, age, and maintenance history.
Roof Ventilation Calculator
Calculate the net free area (NFA) required for proper attic ventilation based on attic size and roof pitch, then determine how many ridge, soffit, or gable vents you need based on vent type.
Roofing Labor Calculator
Estimate crew size, project duration, and labor cost for a roofing job based on roof squares, complexity, and tear-off.
Roofing Material Comparison Calculator
Compare cost, labor, and lifespan of asphalt, metal, tile, and slate roofing materials to find the best value for your home.
Solar-Ready Roofing Calculator
Evaluate whether your roof can support solar panels based on age, area, panel count, and weight.
TPO Roofing Calculator
Membrane area, adhesive, and accessories for TPO system.
EPDM Roofing Calculator
Material quantities for EPDM single-ply roofing.
PVC Roofing Calculator
PVC membrane and accessories from roof area.
Built-Up Roofing Calculator
Ply count, bitumen, and surfacing for BUR system.
Modified Bitumen Calculator
Sheet rolls, adhesive, and cap sheet for mod-bit roofing.
Standing Seam Metal Calculator
Panel count, clips, and trim from roof measurements.
Spray Foam Roofing Calculator
Foam volume and coating from roof area and R-value target.
Roof Insulation Calculator
Insulation R-value and thickness from energy code.
Roof Warranty Comparison Calculator
Total cost of ownership across roofing warranty types.
Cool Roof Calculator
Energy savings from reflective roofing surface.
Foundation Waterproofing Calculator
Material and cost from foundation wall area.
Below-Grade Drainage Calculator
Drain tile sizing from water table and soil permeability.
Deck Waterproofing Calculator
Membrane system for occupied space below decks.
Shower Waterproofing Calculator
Membrane and drain system for tile shower installations.
Green Roof Waterproofing Calculator
Root barrier and membrane for vegetated roof systems.
Tunnel Waterproofing Calculator
Membrane area and injection quantities for tunnel systems.
Plaza Waterproofing Calculator
Waterproofing assembly for pedestrian plaza over occupied space.
Cementitious Waterproofing Calculator
Crystalline waterproofing coverage and application rate.
Joint Sealant Calculator
Sealant volume from joint width, depth, and linear footage.
Water Infiltration Testing Calculator
Test procedure from wall type and ASTM standard.
Vapor Barrier
6-mil poly: floor + optional walls; 10% overlap on floor; 4×100 ft rolls.
Exterior Cladding Calculator
Panel count and material from building envelope area.
Rainscreen Design Calculator
Cavity depth, drainage, and ventilation for rainscreen systems.
EIFS Calculator
EPS board, base coat, and finish for EIFS installation.
Stone Cladding Calculator
Stone panel count, anchors, and sealant.
Metal Panel Calculator
Panel count and sub-framing for ACM or metal cladding.
Brick Veneer Calculator
Brick count, ties, and flashing for veneer walls.
Fiber Cement Calculator
Panel or lap siding quantities from wall area.
Terra Cotta Cladding Calculator
Unit count and sub-frame for terracotta rain screen.
Facade Cleaning Cost Calculator
Cleaning cost from building height and facade material.
Thermal Envelope Calculator
R-value and continuous insulation from climate zone.
Unitized Curtain Wall Calculator
Panel count and dimensions from building facade.
Stick-Built Curtain Wall Calculator
Mullion and transom quantities from facade layout.
Structural Glazing Calculator
Silicone adhesion from glass weight and wind load.
Thermal Performance (CW) Calculator
Overall U-factor from frame, glass, and spacer.
Water Penetration Test Calculator
Test pressure from building height and wind zone.
Curtain Wall Mockup Cost Calculator
Performance mockup cost from size and testing scope.
Spandrel Panel Calculator
Opaque panel insulation and finish for spandrel areas.
Point-Supported Glass Calculator
Fitting layout and glass thickness from panel size and load.
Curtain Wall Sealant Calculator
Perimeter sealant and weep system from joint design.
Blast-Resistant Glazing Calculator
Glass laminate layup from blast threat level.
Window U-Factor Calculator
Calculate overall window U-factor from frame and glass components, with R-value, annual heat loss, and energy cost impact.
Solar Heat Gain Calculator
Calculate solar heat gain through windows based on SHGC, orientation, latitude, and shading to estimate cooling load impact.
Glass Thickness Calculator
Determine minimum glass thickness based on wind load, panel dimensions, glass type, and elevation with safety factor analysis.
Window-to-Wall Ratio Calculator
Calculate window-to-wall ratio and check energy code compliance by climate zone with energy penalty estimates.
Skylight Sizing Calculator
Calculate optimal skylight area, roof percentage, daylight factor, and heat gain impact for natural daylighting design.
Curtain Wall Design Calculator
Calculate curtain wall panel counts, mullion quantities, transom counts, glass area, and structural sealant for facade design.
Window Replacement ROI Calculator
Calculate window replacement return on investment including annual savings, payback period, and 20-year net savings.
Acoustic Glass Rating Calculator
Estimate STC and OITC sound ratings for insulating glass units based on glass thickness, air gap, and laminate interlayer.
Low-E Coating Calculator
Analyze Low-E coating performance including U-factor reduction, SHGC, daylight factor, and seasonal performance by surface position.
Storefront Framing Calculator
Calculate storefront framing quantities including mullions, glass lites, door frames, total linear footage, and estimated weight.
Wall Insulation Calculator
R-value and material from climate zone and wall assembly.
Attic Insulation Calculator
Insulation depth and material from current and target R-value.
Crawl Space Insulation Calculator
Insulation type and R-value for crawl space encapsulation.
Spray Foam Calculator
Board feet of spray foam from area and thickness.
Pipe Insulation Calculator
Insulation thickness from pipe diameter and temperature.
Duct Insulation Calculator
Insulation R-value and material for HVAC ductwork.
Thermal Bridging Calculator
Effective R-value accounting for framing factor.
Radiant Barrier Calculator
Attic heat reduction from radiant barrier installation.
Sound Insulation Calculator
STC improvement from insulation type in wall assembly.
Insulation ROI Calculator
Payback period from energy savings and insulation cost.
Plumbing
Pipe sizing, fixture units, drainage and water supply, residential and commercial.
Water Pipe Sizing Calculator
Size water supply piping based on fixture units and pipe run length, using Hunter's curve and Hazen-Williams friction loss.
Drainage Fixture Unit Calculator
Calculate total drainage fixture units and determine required drain, vent, and stack pipe sizes per plumbing code.
Water Heater Recovery Calculator
Calculate water heater recovery rate, first hour rating, time to full recovery, and standby heat loss.
Septic Tank Sizing Calculator
Size septic tanks and drain fields based on bedrooms, occupants, soil percolation rate, and daily wastewater flow.
Sump Pump Sizing Calculator
Size sump pumps based on pit dimensions, water inflow rate, discharge height, and calculate battery backup duration.
Backflow Preventer Calculator
Determine the correct backflow prevention device type, size, pressure loss, and estimated installation cost based on hazard level.
Gas Pipe Sizing Calculator
Size natural gas piping using the longest run method with Weymouth formula per IFGC standards.
Expansion Tank Sizing Calculator
Size thermal expansion tanks for hot water systems based on system volume, temperature range, and pressure settings.
Water Softener Sizing Calculator
Size a water softener based on water hardness, iron content, household usage, and regeneration frequency.
Grease Trap Sizing Calculator
Size grease interceptors for commercial kitchens based on fixture flow rates, retention time, and load factors per PDI standards.
Bathroom Remodel Plumbing Calculator
Estimate rough-in plumbing costs for a bathroom remodel based on fixture count, relocations, pipe material, and labor rates.
Kitchen Plumbing Calculator
Calculate supply and DWV pipe quantities, fixture units, and material costs for kitchen plumbing rough-in.
Tankless Water Heater Sizing Calculator
Size a tankless water heater by calculating simultaneous flow demand, temperature rise, and required BTU capacity.
Whole House Filtration Calculator
Size a whole-house water filtration system based on household size, flow demand, water hardness, iron levels, and water source.
Sewer Line Replacement Cost Calculator
Compare trenchless pipe bursting vs open-cut sewer line replacement costs based on length, depth, access, and landscaping.
Hose Bib Winterization Calculator
Determine winterization needs and costs for outdoor hose bibs based on climate zone, bib type, and pipe insulation.
Garbage Disposal Sizing Calculator
Find the right garbage disposal horsepower for your household based on family size, cooking habits, and food waste types.
Shower Valve Calculator
Size shower valves based on showerhead count, body sprays, flow rates, and water pressure. Determines thermostatic vs pressure-balance needs.
Water Hammer Arrestor Calculator
Size water hammer arrestors per PDI WH-201 standard based on fixture units and water pressure.
Plumbing Permit Cost Calculator
Estimate residential plumbing permit fees based on project type, fixture count, and your jurisdiction's fee structure.
Septic Pumping Schedule Calculator
Pumping frequency from tank size and household size.
Backflow Testing Cost Calculator
Estimate annual backflow preventer testing costs by device type and count for compliance planning.
Commercial Drain Sizing Calculator
Size commercial drain, vent, and cleanout requirements based on fixture units and building configuration.
Commercial Water Heater Sizing Calculator
Size a commercial water heater based on peak demand, temperature rise, and recovery requirements.
Fire Sprinkler Pipe Sizing Calculator
Size fire sprinkler piping per NFPA 13 based on hazard classification, sprinkler count, and coverage area.
Grease Interceptor Sizing Calculator
Size a grease interceptor for commercial kitchens based on fixture count, flow rate, and drainage period.
Medical Gas Pipe Sizing Calculator
Size medical gas branch and main piping per NFPA 99 from outlet count, flow rate per outlet, and diversity factor. Gas type (oxygen, vacuum, medical air, nitrous oxide) sets the result label only -- it does not change the sizing math.
Plumbing Rough-In Material Takeoff Calculator
Estimate pipe footage, fittings, valves, and material costs for commercial plumbing rough-in.
Rainwater Collection Calculator
Size rainwater harvesting tanks and estimate annual collection based on roof area, rainfall, and usage patterns.
Steam Pipe Sizing Calculator
Size steam distribution piping and condensate handling based on boiler capacity and operating pressure.
DHW Recirculation Loop Calculator
Calculate heat loss, pump sizing, and return temperature for domestic hot water recirculation loops.
Wire Gauge Calculator
Determine the recommended AWG wire gauge based on current, distance, voltage, and acceptable voltage drop.
Circuit Breaker Calculator
Calculate the required breaker amperage and wire gauge for your electrical load with NEC compliance checking.
Pipe Flow Rate Calculator
Calculate water flow rate and velocity based on pipe diameter, pressure, length, and material, plus friction loss based on pressure and length.
Voltage Drop Calculator (Residential)
Calculate voltage drop for residential wiring and check compliance with the NEC 3% recommendation.
BTU / HVAC Sizing Calculator
Calculate the BTU capacity needed for heating and cooling based on room size, insulation, climate, and windows.
Electrical Load Calculator
Calculate total electrical load by circuit type and determine the service panel size and main breaker needed.
Water Heater Size Calculator
Determine the right water heater tank size or tankless GPM based on household size, usage patterns, and water temperatures.
Plumbing Slope Calculator
Calculate the minimum drain pipe slope and total drop needed based on pipe diameter and run length per IPC/UPC code.
Water Pressure Calculator
Calculate static pressure from elevation, friction pressure loss, and resulting dynamic pressure at the outlet.
Amps / Watts / Volts Converter
Convert between amps, watts, and volts. Enter any two values to calculate the third, plus energy cost estimates.
HVAC, Acoustics & Green Building
Load calculations, duct sizing, controls, STC/IIC ratings and energy performance.
BTU Calculator
Calculate heating and cooling BTU requirements for your room or home. Determine the right AC tonnage and furnace size based on room dimensions, insulation, and climate.
Manual J Heat Load Calculator
Estimate heating and cooling loads using a simplified Manual J method based on building envelope, windows, and occupancy.
Duct Sizing Calculator
Size round or rectangular ductwork using the equal friction method based on CFM and desired friction rate.
Refrigerant Charge Calculator
Evaluate refrigerant charge status using subcooling and superheat measurements for TXV and piston metering devices.
Psychrometric Calculator
Calculate wet bulb temperature, dew point, humidity ratio, enthalpy, and specific volume from dry bulb and relative humidity.
Ventilation Rate Calculator
Calculate required outdoor air ventilation rates per ASHRAE Standard 62.1 based on occupancy and space type.
Coil Selection Calculator
Calculate sensible, latent, and total cooling capacity of HVAC coils with sensible heat ratio from air-side measurements.
Boiler Sizing Calculator
Size heating boilers based on building heat loss, domestic hot water load, pickup factor, efficiency, and altitude derating.
Ductwork Pressure Loss Calculator
Calculate total static pressure loss through ductwork including straight runs, fittings, and equipment for blower selection.
Chiller Sizing Calculator
Size chiller systems based on water flow rate, temperature differential, diversity factor, and efficiency metrics.
Air Balance Calculator
Calculate building air balance, pressurization status, and required adjustments from supply, return, exhaust, and outside air flows.
Economizer Savings Calculator
Estimate energy and cost savings from an HVAC economizer by comparing mechanical cooling hours to free-cooling hours.
Mini-Split Sizing Calculator
Size ductless mini-split systems based on room dimensions, insulation quality, windows, and climate zone.
Radiant Floor Design Calculator
Design hydronic radiant floor heating systems including tube length, flow rate, pump head, and boiler sizing.
HRV Sizing Calculator
Size heat recovery ventilators based on building volume, air change requirements, and climate conditions.
Humidification Load Calculator
Calculate humidification requirements including moisture load, steam capacity, water consumption, and energy cost.
BAS Point Count Calculator
Building automation point count from equipment schedule.
Control Valve Sizing Calculator
Cv from flow rate, pressure drop, and fluid properties.
Damper Sizing Calculator
Damper area from CFM and velocity limits.
DDC Controller Selection Calculator
Controller I/O count from field device schedule.
Commissioning Schedule Calculator
Cx timeline from point count and system complexity.
Energy Monitoring Budget Calculator
Submeter count and cost from monitoring requirements.
Setpoint Optimization Calculator
Energy savings from supply air temperature reset.
Sequence of Operations Calculator
Control sequence definition from design intent.
Fault Detection Cost Calculator
FDD system cost and energy savings from fault correction.
BACnet Network Design Calculator
Network segments and routers from device count and location.
STC Rating Calculator
Estimate Sound Transmission Class (STC) for wall assemblies based on wall type, drywall layers, insulation, stud spacing, resilient channel, and staggered studs.
IIC Rating Calculator
Estimate the Impact Insulation Class (IIC) rating of a floor-ceiling assembly based on floor type, underlayment, finish, and ceiling treatment.
Soundproofing Material Calculator
Calculate sound transmission loss using the mass law (TL = 20×log10(f×m) - 47 dB). Supports single and multi-layer assemblies with air gaps.
Room Mode Calculator
Calculate reverberation time (RT60) using the Sabine and Eyring equations. Input room dimensions and surface materials to get RT60, total absorption, and comparison to optimal values.
Noise Reduction Coefficient Calculator
Analyze sound flanking transmission paths. Input the STC of the direct path and each flanking path (walls, floor, ceiling) to find the apparent STC and weakest link.
Sound Masking Calculator
Calculate OSHA noise dose and time-weighted average (TWA) from multiple exposure periods. Determines compliance with OSHA PEL (90 dBA / 8 hr) using the 5 dB exchange rate.
Outdoor Noise Barrier Calculator
Calculate sound barrier insertion loss using the Maekawa method with Fresnel number analysis for outdoor noise barriers.
HVAC Noise Calculator
Estimate HVAC duct noise levels in a room from fan data, duct geometry, and fittings. Calculates sound power, duct attenuation, breakout noise, and NC rating.
Concert Hall Acoustics Calculator
Design a Schroeder QRD (Quadratic Residue Diffuser) panel by computing well depths, panel width, and effective diffusion bandwidth from design frequency and prime number.
Isolation Room Design Calculator
Calculate outdoor sound propagation from a noise source to a receiver. Models geometric spreading, ground effects, and atmospheric absorption (ISO 9613).
LEED Points Calculator
Estimate your LEED v4.1 certification level from credit category point projections across all seven scoring categories.
Passive House Calculator
Evaluate whether your building meets Passivhaus (PHI) certification criteria for heating demand, cooling demand, primary energy, and airtightness.
Net Zero Building Calculator
Analyze whether your building can achieve net-zero energy status by comparing annual consumption against on-site renewable generation.
Embodied Carbon Calculator
Calculate A1-A3 embodied carbon (kgCO2e) for your building's structural and envelope materials — concrete, steel, timber, masonry, glass, and insulation.
Daylighting Factor Calculator
Calculate the Average Daylight Factor for a room based on window area, glass transmittance, room geometry, and surface reflectance.
Living Roof Calculator
Calculate green roof structural loading, stormwater retention capacity, thermal performance, and cost for extensive or intensive systems.
Thermal Bridging Calculator
Calculate the effective R-value reduction and heat loss penalty caused by thermal bridges in your building envelope.
Life Cycle Assessment Calculator
Estimate whole-building life-cycle carbon emissions (kgCO2e) across product, construction, use, and end-of-life stages per ISO 14040.
Indoor Air Quality Score Calculator
Calculate a composite IAQ score (0-100) based on ASHRAE 62.1 ventilation, MERV filtration, CO2, VOC levels, and humidity.
Water Efficiency Calculator
Calculate indoor water use savings from efficient fixtures compared to EPA baseline for LEED WEc2 credit analysis.
Electrical & Vertical Transport
Circuit and conductor sizing, elevator and escalator traffic and capacity.
Electrical Panel Schedule Calculator
Panel load calculation with NEC demand factors for lighting, receptacles, motors, and HVAC.
Feeder Sizing Calculator
Feeder conductor size from load amps and distance, with voltage drop check per NEC 215.2.
Motor Circuit Calculator
Branch circuit protection, conductor, and starter sizing from motor HP per NEC Article 430.
Lighting Control Calculator
Lighting power density check per ASHRAE 90.1 with dimming zone, sensor, and control device counts.
Fire Alarm Initiating Device Calculator
Smoke detector, heat detector, and pull station count from floor plan per NFPA 72.
Nurse Call System Calculator
Station count and system components from patient room count and facility type per UL 1069.
Data Cable Calculator
Cable runs, conduit fill per NEC Table 1, and pathway sizing from network drop count.
Security System Calculator
Camera, card reader, and panel count with PoE budget and storage sizing from facility specs.
Lightning Protection Calculator
Air terminal and conductor layout per NFPA 780 from building dimensions and roof type.
Electrical Rough-In Labor Calculator
Labor hours and cost per device from device counts, building type, and NECA labor units.
Elevator Traffic Analysis Calculator
Car count and capacity from building population and usage.
Elevator Pit Depth Calculator
Pit depth from buffer stroke and code-required clearances.
Escalator Capacity Calculator
Persons per hour from step width, speed, and loading.
Elevator Energy Cost Calculator
Annual energy cost from trips, travel height, and electricity rate.
Elevator Modernization ROI Calculator
Payback from energy savings and reduced maintenance.
ADA Elevator Requirements Calculator
Car dimensions and controls for ADA compliance.
Elevator Weight Capacity Calculator
Maximum occupancy from car area and weight rating.
Machine Room Size Calculator
Equipment room dimensions from elevator configuration.
Elevator Wait Time Calculator
Average wait time from car count, floors, and demand.
Elevator Maintenance Cost Calculator
Annual maintenance cost from type and number of stops.
Elevator Bank Configuration Calculator
Number of elevators from building height and population.
Destination Dispatch Calculator
Wait time improvement from destination dispatch system.
Elevator Hoistway Size Calculator
Shaft dimensions from car size and counterweight.
Hydraulic Elevator Calculator
Cylinder size from car weight and travel height.
Elevator Rope Calculator
Rope count, diameter, and safety factor.
Wheelchair Lift Sizing Calculator
Platform lift specifications from rise height and capacity.
Dumbwaiter Sizing Calculator
Dumbwaiter dimensions and capacity from intended loads.
Elevator Cab Interior Cost Calculator
Cab finish cost from material selection and dimensions.
Elevator Code Compliance Calculator
ASME A17.1 code requirement checklist scoring.
Stairlift Cost Calculator
Stairlift cost from stairway configuration and features.
Firestop, Accessibility & Access
Firestop penetration and fire barrier ratings, ADA compliance, scaffolding loads.
Firestop Joint Calculator
Calculate sealant volume, width-to-depth ratio, and backer rod sizing for fire-rated joint systems.
Firestop Penetration Calculator
Calculate annular space, sealant volume, and packing depth for through-penetration firestop systems.
Through-Penetration F/T Rating Calculator
Determine F and T fire ratings, fill volume, and material requirements for through-penetration firestop systems.
Head-of-Wall Joint Calculator
Calculate mineral wool, sealant, and deflection requirements for head-of-wall firestop joints.
Firestop Pillow Calculator
Calculate intumescent pillow count, layers, and cost from opening dimensions and void percentage.
Perimeter Fire Barrier Calculator
Calculate safing insulation, sealant, and clip quantities for curtain wall perimeter fire barriers.
Firestop Inspection Checklist Scorer
Score firestop installations against IBC/UL inspection criteria and estimate remediation effort.
Expansion Joint Gap Calculator
Calculate sealant volume, packing depth, and system type for expansion joint firestop based on gap width and movement.
Cable Tray Firestop Calculator
Calculate intumescent pillow count, wrap strips, and sealant for cable tray penetration firestopping.
Firestop Documentation Calculator
Estimate documentation volume, inspection reports, and administrative costs for firestop record-keeping.
Accessible Route Evaluator
Evaluate an accessible route for ADA compliance across slope, width, and surface requirements.
ADA Parking Calculator
Calculate required accessible parking spaces and van-accessible spaces per ADA 2010 Standards.
ADA Restroom Calculator
Check restroom ADA compliance for clear floor space, turning radius, grab bars, and sink height requirements.
Assistive Technology Cost Calculator
Estimate assistive technology device costs, funding offsets, and monthly financing payments.
Braille Translation Cost Calculator
Estimate braille transcription costs based on source page count, format, and binding options.
Captioning Cost Calculator
Estimate captioning costs for real-time, post-production, and AI-assisted methods with turnaround times.
Door Width Compliance Calculator
Check ADA door width compliance and calculate required maneuvering clearance for different approach types.
Sign Language Interpreter Cost Calculator
Estimate the cost of hiring sign language interpreters including hourly rates, team requirements, and travel.
WCAG Compliance Calculator
Score your website's WCAG 2.1 compliance across contrast, alt text, keyboard navigation, and ARIA labels.
Wheelchair Ramp Calculator
Calculate ADA-compliant wheelchair ramp length, landings, and handrail requirements based on rise height.
Color Blindness Check
Approximate RGB shifts for protanopia, deuteranopia, and tritanopia (Brettel-style simplification).
Wheelchair Seat Width
Rough seat width from hip measurement (clinical fitting required).
Scaffold Frame Calculator
Frame count from building height and length.
Scaffold Load Rating Calculator
Duty rating from workers, tools, and material on platform.
Scaffold Tie Spacing Calculator
Tie count and spacing from scaffold height and configuration.
Suspended Scaffold Calculator
Wire rope and motor capacity from platform load.
Scaffold Rental Cost Calculator
Daily/weekly rental from frame count and accessories.
Scaffold Erection Time Calculator
Labor hours from scaffold size and configuration.
Mast Climber Calculator
Mast climber capacity from load and building height.
Scaffold Plank Calculator
Plank count and grade from platform area and loading.
Scaffold Safety Checklist Calculator
Inspection scoring from OSHA scaffold standards.
Scaffold Access Calculator
Stairway and ladder access from scaffold height.
Flooring & Finish Carpentry
Floor area and waste factors, specialty substrates, trim and cabinetry.
Hardwood Floor Waste Calculator
Calculate hardwood flooring quantities with waste factors for straight, diagonal, and herringbone patterns including box counts.
Subfloor Leveling Calculator
Calculate self-leveling compound quantities, primer needs, curing time, and cost for subfloor preparation.
Radiant Floor Cost Calculator
Estimate radiant floor heating costs for electric and hydronic systems including materials, installation, and monthly operating costs.
Commercial Carpet Tile Calculator
Calculate carpet tile quantities, boxes, adhesive, and cost for commercial installations with pattern waste adjustments.
Stair Tread Calculator
Calculate stair tread and riser quantities, nosing linear footage, material area, and installation cost by material type.
Terrazzo Floor Calculator
Aggregate, binder, and divider strip for terrazzo installation.
Cork Flooring Calculator
Tile count and adhesive from room dimensions.
Rubber Flooring Calculator
Roll or tile coverage for gym and playground surfaces.
Bamboo Flooring Calculator
Plank count and acclimation time from room dimensions.
Concrete Polishing Calculator
Grinding passes and diamond tooling from floor area.
Heated Floor Calculator
Mat sizing and thermostat for electric radiant floor.
Vinyl Plank Calculator
Plank count with pattern offset and waste factor.
Stone Floor Calculator
Tile count, thin-set, and grout for natural stone.
Anti-Fatigue Mat Calculator
Mat coverage for standing workstations and assembly lines.
Athletic Court Flooring Calculator
Maple hardwood or sport surface from court dimensions.
Crown Molding Calculator
Linear feet and miter angles for rooms with corners.
Baseboard Calculator
Linear footage from room perimeter minus door openings.
Chair Rail Calculator
Rail height and material from room dimensions.
Wainscoting Calculator
Panel count and material from wall dimensions.
Built-In Bookshelf Calculator
Material list from dimensions and shelf spacing.
Trim Stain Paint Calculator
Finish quantity from total linear feet of trim.
Door Casing Calculator
Casing set count and material from door count.
Coffered Ceiling Calculator
Grid dimensions and material from ceiling size.
Shiplap Wall Calculator
Board count and material from wall dimensions.
Custom Closet Calculator
Shelving, rods, and hardware from closet dimensions.
Grout Volume
Estimate grout from tile size, joint width, joint depth, and tiled area.
Caulk Tubes
10 oz cartridges from rectangular joint volume.
Handrail Length
Sloped length from run and rise plus horizontal landing rail.
Board and Batten Calculator
Boards, battens and even spacing for a board-and-batten wall.
Sitework, Surveying & Estimating
Excavation and cut/fill, grades and layout, bids, schedules and project cost.
Trench Volume Calculator
Calculate trench excavation volume using trapezoidal cross-section with truck load and excavation time estimates.
Backfill Quantity Calculator
Calculate backfill volume accounting for pipe displacement and compaction factor with material tonnage estimates.
Soil Compaction Calculator
Calculate bank, loose, and compacted soil volumes with swell/shrink factors, moisture requirements, and lift thickness recommendations.
Excavation Cost Calculator
Estimate excavation costs based on volume, soil type, machine rates, and hauling for earth, rock, or mixed material.
Dewatering Pump Calculator
Calculate dewatering pump requirements including inflow rate, pump capacity, horsepower, and discharge pipe sizing for excavations.
Shoring Design Calculator
Determine OSHA-compliant shoring requirements including slope ratios, shoring type, sheet pile quantities, and cross-brace counts.
Grading & Slope Calculator
Calculate cut/fill quantities, slope percentages, slope ratios, and grade break locations for site grading projects.
Demolition Debris Calculator
Estimate demolition debris volume, weight, dumpster count, disposal cost, and recyclability by construction type.
Asphalt Paving Calculator
Calculate asphalt tonnage, volume, truck loads, and material cost for paving projects based on area dimensions and thickness.
Land Clearing Cost Calculator
Estimate land clearing costs including vegetation removal, stump removal, grading, and project timeline by acreage and conditions.
Area from Coordinates Calculator
Calculate polygon area from coordinate pairs using the shoelace (Gauss) formula. Supports 4-6 vertices with perimeter and centroid output.
Bearing & Distance Calculator
Calculate bearing (azimuth and quadrant) and horizontal distance between two survey coordinate points.
Coordinate Conversion Calculator
Convert between geographic coordinates (latitude/longitude) and UTM (Universal Transverse Mercator) using WGS84 datum.
Horizontal Curve Layout Calculator
Calculate horizontal curve elements including radius, arc length, tangent, chord, external distance, and middle ordinate for highway and road design.
GPS Accuracy Estimator
Estimate GPS/GNSS positional accuracy from satellite geometry (GDOP/PDOP), correction method, and environmental factors.
Grade Staking Calculator
Calculate cut/fill depth, grade rod, and slope stake offsets from design elevation, ground survey, and instrument setup for construction staking.
Map Scale Calculator
Convert between map distance and ground distance at a given scale ratio. Includes accuracy standards and scale classification.
Property Boundary Calculator
Calculate lot area, perimeter, and buildable area from metes and bounds descriptions with closure analysis and setback checks.
Traverse Calculation
Compute latitude, departure, closure error, precision ratio, and enclosed area for a 4-leg closed survey traverse.
Vertical Curve Calculator
Calculate parabolic vertical curve elevations, K-value, high/low point, and minimum length for crest and sag curves using AASHTO standards.
Unit Price Estimator Calculator
Cost per unit from labor, material, equipment, and overhead.
Labor Productivity Calculator
Work hours per unit from crew composition and conditions.
Equipment Rental Cost Calculator
Daily, weekly, and monthly equipment cost comparison.
Overhead and Profit Markup Calculator
Bid markup from overhead rate and target profit.
Quantity Takeoff Calculator
Material quantities from plan dimensions and specifications.
Contingency Calculator
Appropriate contingency percentage from project risk assessment.
Bond Cost Calculator
Payment and performance bond premium from contract value.
Prevailing Wage Calculator
Labor cost with Davis-Bacon or state prevailing wage rates.
Subcontractor Comparison Calculator
Sub bid analysis and scope gap identification.
Mobilization Cost Calculator
Mobilization and demobilization cost from distance and scope.
Post Hole Concrete
Cylindrical volume; ~0.6 ft³ per 80 lb bag rule-of-thumb.
Deck Boards
Rows across width × board run; 8% waste.
Window Well
Prism volume for well; stone weight rough estimate.
Debris Dumpster
C&D volume from area and debris intensity; suggests roll-off size.
Construction Cost Estimator
Owner-side build cost from square footage and finish level.
Change Order Impact Calculator
Calculate the full cost impact of a construction change order including markup, schedule delay costs, and new contract value.
Construction Bid Calculator
Build a construction bid price from material, labor, equipment, overhead, and profit margin. See the full cost breakdown.
Critical Path Method Calculator
Estimate project duration using Critical Path Method (CPM). Calculate critical path length, total float, and schedule compression potential.
Daily Report Score Calculator
Generate a daily site score from safety incidents, inspection results, and weather delays. Track safety, quality, and productivity alongside your logged workforce count.
Earned Value Management Calculator
Perform Earned Value analysis to track project cost and schedule performance. Calculate CPI, SPI, EAC, ETC, and variance metrics.
Equipment Utilization Calculator
Track construction equipment utilization, idle time, mechanical availability, and effective cost per operating hour.
Liquidated Damages Calculator
Calculate liquidated damages for construction schedule delays. Apply daily LD rates with contractual cap limits.
Material Escalation Calculator
Calculate material price escalation over time using compound escalation rates. Determine adjusted costs for change orders and contract amendments.
Punch List Progress Calculator
Track construction punch list completion, critical item progress, and estimated days to close out. Assess readiness for substantial completion.
Retainage Calculator
Calculate construction retainage amounts, progress payments, and retained balances. Supports retainage cap percentages.
Square Footage Calculator
Calculate the square footage of a rectangular area. Convert between square feet, yards, and meters. Estimate total cost based on price per square foot.
Paint Calculator
Calculate how many gallons of paint you need for a room. Accounts for doors, windows, and multiple coats.
Paint Coverage Calculator
Calculate how much paint you need for your room. Estimate gallons and quarts based on room dimensions and coverage.
Tile Calculator
Calculate how many tiles you need for your floor or wall project. Account for waste and see total tiles needed.
Flooring Calculator
Calculate how much flooring you need for a room. Accounts for waste, calculates boxes needed, and estimates cost.
Lumber Calculator
Calculate board feet for lumber purchases. Enter dimensions and quantity to get total board footage and estimated cost.
Drywall Calculator
Calculate how many drywall sheets, joint tape, compound, and screws you need for your project.
Gravel & Mulch Calculator
Calculate how much gravel, mulch, sand, or topsoil you need in cubic yards, tons, and bags.
Roof Pitch Calculator
Calculate roof pitch in degrees and percentage from rise and run measurements. Determine roof type and rafter length.
Deck Cost Calculator
Estimate the total cost of building a deck including materials, railing, stairs, and labor based on size and material type.
Fence Material Calculator
Estimate fence materials and costs including posts, panels, rails, and gates for wood, vinyl, chain link, or aluminum fencing.
Insulation Calculator
Calculate insulation costs, energy savings, and payback period for a project you've already sized -- enter your own expected energy savings percentage.
Roofing Calculator
Calculate roofing materials needed for your roof. Estimate shingles, squares, and costs based on roof dimensions and pitch.
Wallpaper Calculator
Calculate wallpaper needed for a wall. Estimate rolls, strips, and account for pattern repeats.
Home Project Calculator
Comprehensive home improvement calculator for paint, flooring, tile, drywall, concrete, roofing, deck, and fence projects. Get material quantities, labor estimates, and shopping lists.
Stair Calculator
Calculate stair dimensions including number of risers, treads, stringer length, and angle. Verify building code compliance and get material estimates.
Concrete Calculator
Calculate how much concrete you need in cubic yards, bags, and cost for slabs, footings, and walls.
Concrete Volume Calculator
Calculate concrete volume needed for your project. See cubic yards, cubic meters, and number of bags needed.
Pools & Play Structures
Pool volume and structure, playground fall height, use zones and surfacing.
Pool Excavation Volume Calculator
Cubic yards for pool dig from shape and depth.
Rebar Grid Calculator
Rebar quantity for gunite/shotcrete pool shell.
Pool Plumbing Calculator
Pipe sizing and plumbing materials for pool circulation.
Pool Deck Area Calculator
Concrete or paver area for pool surround.
Pool Equipment Pad Calculator
Pad dimensions from equipment layout.
Pool Electrical Calculator
Circuit requirements for pump, heater, lights, and automation.
Infinity Edge Calculator
Catch basin sizing and pump requirements for vanishing edge.
Pool Fence Calculator
Fence linear footage and gate count for code compliance.
Pool Cover Calculator
Cover dimensions and type selection from pool shape.
Pool Renovation Cost Calculator
Replaster, retile, and equipment upgrade cost estimator.
Playground Equipment Budget Calculator
Estimate total playground project cost including equipment, installation, site prep, surfacing, and shade based on age group and child capacity.
Safety Surfacing Calculator
Calculate volume, weight, and cost of playground safety surfacing materials for a given fall height and area per CPSC/ASTM F1292.
Use Zone Calculator
Calculate ASTM F1487-compliant clearance/fall zones around playground equipment including slides, swings, climbers, and rotating equipment.
ADA Accessible Playground Calculator
Calculate ADA-compliant accessible play component counts, ramp requirements, transfer platforms, and accessible surfacing for playground design.
Shade Structure Calculator
Size shade sails, canopies, or shelters for playground UV protection — accounts for sun angle, latitude, coverage target, and mounting height.
Playground Maintenance Cost Calculator
Estimate annual playground maintenance costs including surfacing top-off, equipment repair, inspections, vandalism reserve, and hardware replacement.
Sports Court Dimensions Calculator
Get regulation court dimensions, safety overrun zones, fencing, surfacing, and cost for basketball, tennis, pickleball, volleyball, futsal, or multi-use courts.
Splash Pad Design Calculator
Design a splash pad/spray park — feature count, pump sizing, water usage, and cost estimates for flow-through or recirculating systems.
Trail Design Calculator
Design park trails and paths — grade analysis, ADA compliance, surface material quantities, drainage, and construction cost estimates.
Dog Park Sizing Calculator
Size an off-leash dog park — fenced area, separate small/large zones, surfacing, fencing, and amenity requirements from peak dog capacity.
Sandbox Volume Calculator
Sand volume from sandbox dimensions and fill depth.