Automotive Calculators
13 tools, each with formula and worked examples
Auto loan, MPG, depreciation, lease vs. buy, and vehicle calculators.
Performance & Maintenance· 4
Engine Horsepower Calculator
Calculate engine horsepower from torque and RPM using the classic formula HP = (Torque x RPM) / 5252. Free, in…
Horsepower
Estimate your vehicle's horsepower from quarter-mile ET and trap speed using the Hale formula. Includes drivet…
Tire Size Comparison Calculator
Compare two tire sizes and calculate the diameter difference, speedometer error, and fitment impact of changin…
Car Depreciation
Calculate how much a vehicle will depreciate over your ownership period. Shows total depreciation, future valu…
Fuel & Efficiency· 5
Fuel Cost Calculator
Calculate trip fuel costs for gas, diesel, EV, and PHEV vehicles. Handles MPG, L/100km, km/L, EV efficiency, a…
Gas Mileage
Calculate your fuel economy in MPG or L/100km using odometer readings or trip distance. Free online calculator…
Mileage Reimbursement
Calculate IRS-standard mileage reimbursement for business, medical, and charitable driving. Includes tax savin…
MPG Calculator
Calculate MPG from miles driven and fuel used, estimate trip fuel costs, determine driving range, or convert b…
Trip Fuel Cost
Calculate the total fuel cost for any road trip with unit support for miles/MPG and km/L/100km. Free, instant,…