Car, Fuel & Mileage Calculators
Plan a road trip budget, check whether your car is getting the fuel economy it should, or see how a new tire size will change your speedometer reading. These calculators cover the everyday maths of owning and driving a vehicle.
Automotive tools
Fuel Cost Calculator
Free fuel cost calculator for road trips. Enter distance, MPG, and gas price to see total cost, gallons needed, cost per mile, and round-trip totals.
Gas Mileage Calculator
Free gas mileage calculator to find your car's MPG from one fill-up or track many. Get L/100km, km/L, cost per mile, and best and worst MPG figures.
Horsepower Calculator
Free horsepower calculator using HP = torque x RPM / 5252. Solve for horsepower, torque in lb-ft, or engine RPM when you know the other two values.
Engine Horsepower Calculator
Estimate engine horsepower from vehicle weight and quarter-mile elapsed time or trap speed. Free calculator with a 1/4 mile performance reference.
Mileage Calculator
Free mileage calculator to log trips by start and end odometer readings. Get total miles, average MPG, total fuel, and cost per mile for your driving.
Tire Size Calculator
Free tire size calculator to compare two tire sizes by width, aspect ratio, and wheel diameter. See diameter change, revs per mile, and speedometer error.