Automotive & Motorcycles
Owning, running, repairing and modifying road vehicles — running costs, EV charging, performance tuning, classics and motorcycles.
Owning and running a vehicle, then making it faster. Fuel cost and economy, total cost of ownership, lease versus buy, depreciation, tyre and wheel size changes, and EV charging time, range and cost per mile.
Repair and maintenance cover service intervals, labour times and repair-versus-replace decisions; performance covers gear ratios, horsepower and torque, compression, forced induction and drivetrain loss.
Motorcycles and classic cars keep their own sections: lean angle and chain sizing, sprocket ratios and jetting, restoration budgets and valuation.
65 calculators in 4 sections.
Start with these
The questions people most often bring to this page, and the calculator that answers each one.
- Nitrous Jet Selection Calculator — Nitrous and fuel jet pairing for a target horsepower.
- Quarter-Mile ET Predictor Calculator — Quarter-mile ET and trap speed from weight and power.
Matches are ranked by relevance. Use CtrlK anytime to search the full site.
Running Costs & Ownership
Fuel cost, MPG, TCO, lease vs buy, depreciation and EV charging cost.
Car Lease Calculator
Calculate your monthly car lease payment, total lease cost, depreciation, and finance charges. Compare lease terms and money factors.
Gas Mileage Calculator
Calculate your fuel economy in MPG, cost per mile, and annual fuel costs. Convert between MPG, L/100km, and km/L.
Car Depreciation Calculator
Estimate how much your car has depreciated and project future values. Understand the true cost of vehicle ownership over time.
Road Trip Cost Calculator
Estimate the total cost of a road trip including fuel, hotels, meals, and tolls. Split costs between passengers.
EV vs Gas Cost Comparison
Compare the total cost of owning an electric vehicle vs a gas car. Includes fuel, maintenance, and purchase price over time.
Car Loan Calculator
Calculate monthly car payments including down payment, trade-in, sales tax, and total interest over the loan term.
Tire Size Calculator
Calculate tire dimensions, compare sizes, and check speedometer accuracy when changing tire sizes.
EV Charging Cost Calculator
Calculate the cost to charge your electric vehicle at home or at a station. See charging time estimates for Level 1, 2, and DC fast charging.
Fuel Cost Calculator
Calculate fuel cost for a trip based on distance, fuel price, and fuel efficiency (MPG or L/100km). See cost per mile/km.
Car Value Calculator
Estimate your car's current value based on age, mileage, and condition. Calculate depreciation.
Complete Auto Calculator
Comprehensive vehicle calculator with buy vs lease analysis, total cost of ownership, road trip costs, and EV vs gas comparisons. Make informed car decisions.
Horsepower Calculator
Calculate engine horsepower from torque and RPM or estimate HP from quarter mile time and vehicle weight. Convert between HP, kW, and metric horsepower.
Trip Fuel Cost
Fuel cost from distance, MPG, and price per gallon.
Car Depreciation
Rough value after compound annual depreciation with a condition factor.
2-Stroke Fuel Mix Calculator
Oil quantity for any two-stroke petrol mix ratio.
EV Battery Degradation Calculator
Estimate EV battery capacity loss based on charge cycles, temperature exposure, age, and charging habits. Predict replacement timeline.
EV Battery Replacement Calculator
Evaluate whether replacing your EV battery is worth it. Calculate value after replacement, years of extended life, cost per mile, and get a recommendation.
EV Charging Time Calculator
Calculate how long it takes to charge an electric vehicle based on battery size, current charge level, target level, and charger power.
EV Fleet Conversion Calculator
Analyze the cost of converting a vehicle fleet to electric. Compare total costs, savings, and CO2 reduction over your analysis period.
EV Home Charging Cost Calculator
Calculate daily, monthly, and annual EV home charging costs. Compare to equivalent gas prices and see the impact on your electric bill.
EV Range Calculator
Estimate real-world electric vehicle range accounting for battery capacity, temperature, HVAC usage, and terrain conditions.
EV Road Trip Planner Calculator
Plan an EV road trip by calculating charging stops needed, total trip time, and driving vs charging time breakdown.
Solar EV Charging Calculator
Calculate how many solar panels you need to charge your EV. See system size, annual production, savings, and payback period.
EV Tax Credit Calculator
See why the federal EV tax credit no longer applies, and estimate your effective price from a state or utility incentive you enter yourself.
EV vs Gas Car Cost Comparison
Compare 10-year total cost of ownership between an electric vehicle and gas car. Includes fuel, maintenance, insurance, and depreciation.
Repair & Maintenance
Service intervals, labour times and repair-versus-replace decisions.
Repair vs Replace Decision Calculator
ROI of repair vs replacement.
Brake Job Cost Calculator
Brake service cost from scope and vehicle class.
Oil Change Interval Calculator
Interval index from conditions and oil type.
Tire Life Calculator
Remaining life from tread and usage.
Engine Displacement Calculator
Displacement from bore, stroke, and cylinders.
Transmission Fluid Cost Calculator
Service cost from capacity and fluid type.
Alignment Cost Calculator
Alignment pricing by axle count.
AC Recharge Cost Calculator
Refrigerant and labor cost estimate.
Catalytic Converter Cost Calculator
Replacement cost by vehicle class.
Used Car Inspection Checklist Calculator
Inspection score and expected issues cost.
Performance & Classic Cars
Gear ratios, horsepower and torque, compression, boost and restoration cost.
Dyno Correction Calculator
SAE-corrected HP from dyno conditions.
Turbo Sizing Calculator
Turbocharger selection from engine displacement and power target.
Exhaust Flow Calculator
Exhaust pipe diameter from engine output and RPM.
Intercooler Sizing Calculator
Intercooler efficiency from charge air temp and flow rate.
Fuel Injector Sizing Calculator
Injector flow rate from engine HP and fuel type.
Nitrous Jet Selection Calculator
Nitrous jet size from desired HP increase and system type.
Camshaft Duration Calculator
Cam specs from target RPM range and application.
Compression Ratio Calculator
Static CR from bore, stroke, and chamber volume.
Weight-to-Power Ratio Calculator
Performance metric from vehicle weight and HP.
Quarter-Mile ET Predictor Calculator
Elapsed time from weight and horsepower.
Classic Car Value Calculator
Value from make, model, year, condition, and provenance.
Restoration Budget Calculator
Total restoration cost from condition class and scope.
Classic Car Insurance Calculator
Agreed value coverage cost from vehicle value and usage.
Parts Sourcing Cost Calculator
Reproduction vs NOS vs used parts cost comparison.
Classic Car Storage Calculator
Climate-controlled storage cost and preparation.
Matching Numbers Value Calculator
Value premium for matching numbers drivetrain.
Concours Scoring Calculator
Concours d'elegance judging score from condition details.
Classic Car Appreciation Calculator
Historical appreciation rate by make, model, and era.
Event Transport Cost Calculator
Enclosed trailer rental and transport for show attendance.
Classic Car Club Cost Calculator
Annual membership and event cost for marque-specific clubs.
Motorcycles
Lean angle, chain and sprocket sizing, jetting and running costs.
Fork Oil Level Calculator
Calculate fork oil volume and air gap for suspension tuning.
Helmet Size Calculator
Determine your helmet size from head circumference and shape.
Carburetor Jet Sizing
Calculate carburetor jet size corrections for altitude and temperature.
Lean Angle Calculator
Calculate safe lean angle from speed, turn radius, and tire grip coefficient.
Motorcycle Chain Length
Calculate chain links from sprocket teeth and center distance.
Motorcycle Fuel Range
Calculate riding range from tank size and fuel consumption.
Motorcycle Gear Ratio
Calculate speed per RPM for different sprocket combinations.
Motorcycle Insurance Estimator
Estimate motorcycle insurance premium from bike type, rider age, and coverage level.
Suspension Sag Calculator
Calculate free and rider sag to check whether your spring rate and preload need adjustment.
Track Day Cost Calculator
Calculate total track day cost including fees, consumables, fuel, and travel.