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