Automotive & Transportation Calculators

16 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, EV charging time, EV vs. gas cost comparison, car CO2 emissions, speedometer error, fuel tank range, tire pressure vs temperature, and average annual mileage calculators. Everything runs locally in your browser — nothing is ever uploaded.

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Fuel Consumption Calculator

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.

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Trip Fuel Cost Calculator

Estimate the total fuel cost of a trip based on the distance, your car's fuel consumption rate, and the local price of fuel.

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Distance Between Cities Calculator

Calculate the straight-line (great-circle) distance between two major world cities in kilometers and miles.

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Horsepower Calculator

Calculate an engine's horsepower from its torque and RPM (revolutions per minute), and see the equivalent power in kilowatts.

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Tire Size Calculator

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.

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Stopping Distance Calculator

Estimate a vehicle's total stopping distance — combining reaction distance and braking distance — based on speed, driver reaction time, and road surface condition.

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Gear Ratio Calculator

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.

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Engine RPM Calculator

Calculate a car's engine RPM at a given road speed, based on the tire diameter, transmission gear ratio, and final drive (differential) ratio.

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EV Charging Time Calculator

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.

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EV vs. Gas Cost Comparison Calculator

Compare the annual fuel cost of driving an electric vehicle versus a gas-powered car, based on your driving distance and local fuel and electricity prices.

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Car Depreciation Calculator

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.

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Car CO2 Emissions Calculator

Calculate the estimated CO2 emissions from a trip or your car's fuel consumption, based on distance traveled, fuel efficiency, and fuel type.

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Speedometer Error Calculator

Calculate how much your speedometer and odometer over-read or under-read after switching to a different tire diameter, and find your true speed and true distance.

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Fuel Tank Range Calculator

Estimate how many kilometers or miles you can drive on the fuel remaining in your tank, from your tank capacity, current fuel level, and consumption rate.

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Tire Pressure vs Temperature Calculator

Calculate how your tire pressure will change when the temperature changes, using the physics of gas pressure (Gay-Lussac's Law) — know before your TPMS light does.

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Average Annual Mileage Calculator

Check whether a car's mileage is low, average, or high for its age, based on the odometer reading and how many years it's been driven.