Every drive.
A little more understood.
From your next fill-up to your next set of tires.
Free automotive tools that show their work.
What are you working out?
Fuel Cost Calculator
Estimate trip fuel cost, fuel needed, and split costs in miles and MPG or kilometers and L/100 km.
Fuel & mileageMPG Calculator
Calculate fuel economy from a fill-up in miles or kilometers and U.S. gallons, UK gallons, or liters. Get MPG, L/100 km, and km/L.
Fuel & mileageMPG to L/100 km Converter
Convert fuel economy both ways between U.S. MPG, UK MPG, L/100 km, and km/L. Includes formulas and a comparison table.
Fuel & mileageAnnual Fuel Cost Calculator
Estimate annual and monthly fuel spending using miles and MPG or kilometers and L/100 km.
Electric vehiclesEV Charging Cost Calculator
Estimate charging-session cost and energy drawn from the wall, including charging losses.
Electric vehiclesEV Charging Time Calculator
Estimate EV charging time from battery capacity, charge range, and average charging power.
Electric vehiclesEV vs Gas Cost Calculator
Compare yearly electricity and gasoline spending for the same driving distance.
Tires & wheelsTire Size Calculator
Calculate nominal tire diameter, sidewall height, circumference, and revolutions per mile.
Tires & wheelsTire Size Comparison Calculator
Compare two tire sizes with a scale diagram, dimension table, and speedometer estimates.
Engine & drivetrainEngine Displacement Calculator
Calculate engine swept volume in liters, cubic centimeters, and cubic inches from bore and stroke.
Engine & drivetrainHorsepower & Torque Calculator
Calculate mechanical horsepower from torque and engine speed at the same operating point.
Engine & drivetrainGear Ratio RPM Calculator
Estimate engine RPM from road speed, tire diameter, transmission gear, and final drive ratio.
No calculators match. Try “fuel”, “EV”, “tire”, or “engine”.
A result you can follow.
Start with your numbers
Use your mileage, prices, and vehicle specifications. Example values are always editable.
See the calculation
Every tool includes its formula and a worked example, so the answer is never a black box.
Know the limits
Clear assumptions help you understand where an estimate ends and a vehicle-specific check begins.