Automotive & Transportation Calculators10 free tools for drivers and car owners: fuel consumption and trip fuel cost calculators, a distance-between-cities calculator, horsepower, tire size, stopping distance, gear ratio, engine RPM, and EV charging time calculators. Everything runs locally in your browser — nothing is ever uploaded.
Calculate your car's fuel consumption in liters per 100 km (and the equivalent miles per gallon) from the distance traveled and the fuel used.
Estimate the total fuel cost of a trip based on the distance, your car's fuel consumption rate, and the local price of fuel.
Calculate the straight-line (great-circle) distance between two major world cities in kilometers and miles.
Calculate an engine's horsepower from its torque and RPM (revolutions per minute), and see the equivalent power in kilowatts.
Decode a tire size code (like 205/55R16) into its actual sidewall height, overall diameter, and circumference, and compare it against a second tire size.
Estimate a vehicle's total stopping distance — combining reaction distance and braking distance — based on speed, driver reaction time, and road surface condition.
Calculate the gear ratio between a drive gear and a driven gear from their number of teeth, and find the resulting output speed and torque multiplier.
Calculate a car's engine RPM at a given road speed, based on the tire diameter, transmission gear ratio, and final drive (differential) ratio.
Estimate how long it will take to charge an electric vehicle's battery from a starting charge percentage to a target percentage, based on charger power and charging efficiency.
Estimate how much your car's value will decline over the next few years using a fixed annual depreciation rate, and see the estimated resale value year by year.