Automotive Calculators
Last updated: October 2026
Engine CFM Calculator
Calculate the carburetor or throttle body airflow requirement (in CFM) for an engine based on displacement and maximum RPM.
Car Affordability Calculator
Calculate the maximum car price you can afford based on your monthly income, down payment, loan rate, and term.
RPM to Speed Calculator
Convert engine RPM into real vehicle speed in miles per hour using tire size and final drive ratio.
Engine Displacement Calculator
Calculate an engine's total displacement from bore, stroke and number of cylinders, in cubic centimeters, liters or cubic inches.
Fuel Cost Per Kilometre Calculator
Works out how much fuel costs you for every kilometre driven, from the fuel price and your vehicle’s consumption in litres per 100 km.
EV Charging Cost & Time Calculator
Estimate the total cost of charging your EV from one state of charge to another, including charging losses and any time-based (per-minute or idle) session fees that depend on charger speed.
Tire Size & Speedometer Calculator
Find out exactly how swapping to a different tire size shifts your speedometer reading and changes overall tire diameter.
Trip and Commute Fuel Cost Calculator
Estimate the gas cost of a commute or trip from the distance, your highway MPG, the gas price, one-way or round trip, and how much of the driving is in town.
Tire Pressure Temperature Calculator
Work out what your tire pressure becomes when the temperature changes: set 35 PSI on a 70 °F day and it reads about 31 PSI at 30 °F.
Horsepower from Torque Calculator
Calculate engine horsepower from torque in lb-ft and engine speed in RPM with HP = torque × RPM ÷ 5,252, plus the metric versions of the formula.
EV vs Gas Total Cost of Ownership Calculator
Whether an electric car or a gasoline car costs less over the years you keep it: fuel versus electricity at your mileage and local prices, the EV's lower maintenance, and its higher purchase price.
Vehicle Depreciation Calculator
Estimate your vehicle's current market value by factoring in age, mileage, vehicle type, and condition.
Car Lease vs Buy Calculator
Compare the net cost of leasing a car with buying it and selling it at the end of the same period: total lease payments versus loan payments plus down payment minus the car's resale value.
Compression Ratio Calculator
Calculate an engine's static compression ratio from bore, stroke and total clearance volume per cylinder, with the swept volume of one cylinder.
Trailer Tongue Weight Calculator
Calculate trailer tongue weight from the loaded trailer weight and tongue percentage, and see the 10-15% range recommended for conventional ball-hitch trailers.
Gas Mileage Calculator
Work out your car's real gas mileage (MPG) from the miles driven and gallons used between two fill-ups, or show it in liters per 100 km.
Quarter Mile Time Calculator
Estimate how fast your car will run the quarter mile based on its power-to-weight ratio.
Vehicle Stopping Distance Calculator
Estimate total stopping distance from speed, reaction time, road surface, brake and tire condition and road grade, split into reaction distance and braking distance.
Auto Lease Calculator
Estimate the monthly payment on a car lease from the negotiated price, down payment, residual value, lease term, money factor and sales tax.
PSI to Bar Converter
Convert pressure between pounds per square inch (psi) and bar in either direction, for tires, compressors, hydraulics and gauges.
Nm to Ft-Lbs Converter (Torque)
Convert between Newton-metres (Nm) and foot-pounds (ft-lb) of torque in both directions.
Auto Refinance Calculator
Compare your current car loan with a refinance offer: new monthly payment, the change from your current payment, and the total you save or lose over the life of each loan after fees.