Fast, simple and accurate calculators
Free tools that work instantly in your browser. No signup, no clutter — just the answer and a clear explanation of how it was worked out.
Automotive Calculators
View all automotive calculatorsSimple, accurate calculators for fuel costs and economy, EV charging, tires and wheels, gearing and performance, and unit conversions.
Fuel Cost Calculator
Work out how much fuel a trip will use and what it will cost, from the distance, your car's fuel consumption and the fuel price.
Fuel Consumption Calculator
Work out your car's real fuel consumption from the distance you drove and the fuel you used, in L/100 km, km/L and US MPG.
Annual Fuel Cost Calculator
Estimate what you spend on fuel in a year and per month, from how far you drive, your car's fuel consumption and the fuel price.
Cost per Kilometre Calculator
Work out the fuel cost of every kilometre you drive from your car's fuel consumption and the fuel price. Fuel only, not total running costs.
Fuel Savings Calculator
Compare the yearly fuel use and fuel cost of two vehicles, or two ways of driving, from their fuel consumption.
Fuel Range Calculator
Work out how far you can drive on the fuel in your tank, from the litres of fuel and your car's fuel consumption.
MPG Calculator
Work out your car's real fuel economy in US miles per gallon from the miles you drove and the gallons you used.
L/100 km to MPG Converter
Convert fuel consumption in litres per 100 km (L/100 km) to US miles per gallon (MPG).
MPG to L/100 km Converter
Convert fuel economy in US miles per gallon (MPG) to litres per 100 km (L/100 km).
EV Charging Cost Calculator
Estimate what it costs to charge an electric car from its battery size, how much charge you add, your electricity price and an assumed charging efficiency.
Tire Size Calculator
Compare two tire (tyre) sizes side by side: overall diameter, sidewall height, circumference, revolutions per km and mile, and the effect on your speedometer.
Wheel Offset Calculator
Compare a new wheel with your current one to see how the width, offset (ET) and any spacer change the inner clearance and outward poke.
Gear Ratio Calculator
Work out your car's road speed at any engine RPM, or the RPM at any speed, from the gear ratio, final drive ratio and tire diameter. Results in mph and km/h.
Power-to-Weight Calculator
Work out a car's power-to-weight ratio in hp and kW per tonne, and its weight per horsepower in kg and lb. Enter power in hp or kW and weight in kg or lb.
Kilometres to Miles Converter
Convert a distance in kilometres (km) to miles (mi) using the exact international mile.
Miles to Kilometres Converter
Convert a distance in miles (mi) to kilometres (km) using the exact international mile.