Civil Engineering
Civil engineering calculators for beam analysis, soil mechanics, stormwater, pavement design, and infrastructure planning.
Matches are ranked by relevance. Use CtrlK anytime to search the full site.
Beam Load Calculator
Calculate maximum shear, bending moment, and deflection for simply supported and cantilever beams under uniform or point loads.
Concrete Mix Design Calculator
Design a concrete mix by specifying target strength, water-cement ratio, and cement content. Get weights for cement, water, fine and coarse aggregates per cubic yard.
Rebar Spacing Calculator
Calculate rebar spacing, bars per foot, and steel ratio for concrete slabs. Checks ACI code compliance for maximum spacing.
Soil Bearing Capacity Calculator
Calculate ultimate and allowable soil bearing capacity using Terzaghi's equation. Inputs include soil cohesion, friction angle, and foundation geometry.
Retaining Wall Design Calculator
Calculate active earth pressure, overturning moment, and sliding forces on a retaining wall using Rankine's theory.
Storm Drain Sizing Calculator
Size storm drain pipes using the Rational Method for flow estimation and Manning's equation for pipe capacity. Selects nearest standard pipe size.
Traffic Signal Timing Calculator
Calculate signal green time, effective green, volume-to-capacity ratio, and average delay per vehicle for signalized intersections.
Pavement Thickness Calculator
Design flexible pavement thickness using a simplified AASHTO 1993 method. Calculates required structural number and layer thicknesses for asphalt, base, and subbase.
Culvert Sizing Calculator
Size circular culverts by checking inlet and outlet control headwater depths. Determines if a selected pipe size is adequate for the design flow.
Slope Stability Calculator
Analyze slope stability using the infinite slope method. Calculates factor of safety considering cohesion, friction, pore pressure, and slip depth.
Bridge Load Rating Calculator
Calculate bridge load rating factor using LRFR methodology. Determines if a bridge passes HL-93 design loading and whether posting is required.
Catch Basin Spacing Calculator
Calculate maximum catch basin (inlet) spacing based on gutter flow capacity, cross slope, and design rainfall intensity.
Superelevation Calculator
Calculate highway curve superelevation rate, bank angle, minimum curve radius, and maximum safe speed using AASHTO design formulas.
Sight Distance Calculator
Calculate stopping sight distance (SSD), decision sight distance, and passing sight distance for highway design using AASHTO formulas.
Earthwork Volume Calculator
Calculate earthwork cut or fill volume using the Average End Area method. Estimates truck loads and cost for excavation or fill operations.
Compaction Test Calculator
Calculate wet density, dry density, void ratio, and degree of saturation from Proctor compaction test data.
Foundation Settlement Calculator
Estimate immediate elastic settlement and consolidation settlement of shallow foundations. Includes time estimate for 90% consolidation.
Pile Capacity Calculator
Estimate single pile bearing capacity including point resistance and skin friction. Uses alpha and beta methods with a factor of safety of 2.5.
Water Demand Forecasting Calculator
Forecast future water demand based on population growth, per capita usage, and peak factors. Estimates required storage capacity.
Wastewater Treatment Sizing Calculator
Size key components of an activated sludge wastewater treatment plant: aeration, clarifiers, aeration power, and sludge production.
Pressure at Depth
Hydrostatic pressure P = ρgh.