AutoCalc catalog
Car calculators
Practical automotive tools with instant results, clear formulas and no signup. Live calculators are ready to use; planned pages remain unpublished until their calculations are complete.
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Live calculators
Maintenance
Towing Capacity Calculator
Compare GCWR, GVWR, manufacturer tow and hitch limits using supplied ratings and loaded vehicle weight. This checks constraints rather than looking up model ratings.
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Vehicle Payload Calculator
Calculate remaining weight allowance below GVWR using vehicle weight, occupants, cargo and hitch load. Use ratings for your exact vehicle configuration.
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Oil Change Interval Calculator
Check remaining mileage, engine hours and months against the oil-change limits you supply. Use your vehicle schedule rather than a universal interval.
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Car Repair Cost Calculator
Total labor hours, hourly rate, parts, supplies and additional charges from a repair quote. See the complete cost breakdown.
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Car Maintenance Cost Calculator
Estimate average maintenance, tire and annual-service costs using your own prices and intervals. Get annual, monthly and per-kilometer budget figures.
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Lease Mileage Overage Calculator
Calculate total lease mileage allowance, projected end-of-term mileage and excess-mileage charges using your contract rate.
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Lease Buyout Calculator
Add the buyout quote, confirmed taxes and fees. Compare it with your supplied vehicle value and estimate a loan payment for financing the buyout.
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Cash vs Finance Car Calculator
Compare a cash purchase quote with the total payments on a financing quote. Include down payment, fixed interest rate, term and separate upfront fees.
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Balloon Car Loan Calculator
Calculate monthly payments and the final balloon from loan amount, interest rate and term. Compare interest with a fully amortizing loan.
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Car Battery Charge Time Calculator
Estimate battery recharge time from amp-hour capacity, charge change and average charging current. Understand how tapering current affects the estimate.
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EV Range Calculator
Estimate electric-vehicle range from usable battery capacity, current state of charge, reserve and measured consumption in kWh per 100 km.
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Vehicle Acceleration Calculator
Calculate average acceleration from initial speed, final speed and measured elapsed time. Estimate distance under a clearly stated constant-acceleration assumption.
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Braking and Stopping Distance Calculator
Estimate reaction distance, braking distance and total stopping distance from speed, reaction time and an explicitly chosen friction coefficient.
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Mean Piston Speed Calculator
Calculate mean piston speed from stroke and engine RPM. Get m/s and ft/min, with an explanation of why mean speed differs from peak speed.
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Engine Oil Consumption Calculator
Calculate oil consumption per 1,000 km from measured distance and oil added. See distance per liter and projected top-up volume for a chosen distance.
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Fuel Injector Size Calculator
Estimate injector flow from engine horsepower, BSFC, injector count, duty cycle and fuel density. Get lb/hr and cc/min with the assumptions explained.
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Horsepower and Torque Calculator
Convert torque and RPM into kW, mechanical horsepower and metric horsepower, or calculate torque from horsepower at a specified engine speed.
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Engine Hours Calculator
Estimate engine hours from distance and average moving speed, with separate idle time. Convert total engine hours back to distance with explicit assumptions.
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Compression Ratio Calculator
Calculate static compression ratio using chamber volume, compressed gasket dimensions, piston deck clearance and dish or dome volume. See the full clearance-volume breakdown.
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Engine Displacement Calculator
Calculate engine displacement from bore, stroke and cylinder count. Get cubic centimeters, liters and cubic inches, with the formula and a worked example.
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kW to horsepower
Convert engine power between kilowatts and metric horsepower.
Open calculatorFuel
LPG conversion payback
Compare petrol and LPG costs and estimate the mileage and time to recover conversion costs.
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Wheel offset
Compare wheel width and offset, suspension clearance, outer poke, backspacing and fitment.
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Gear ratio
Calculate vehicle speed and engine RPM from tire diameter, transmission gear and final drive ratio.
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Trip cost
Estimate fuel needed, route cost and the amount per passenger.
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Tire size
Compare tire and wheel sizes, clearance, diameter and speedometer error.
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Fuel cost and MPG
Calculate fuel cost, gas mileage, MPG, trip fuel use and cost per mile.
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Power-to-weight ratio
Calculate horsepower or kilowatts per pound, kilogram and metric ton.
Open calculatorOwnership
Vehicle depreciation
Estimate future value, depreciation by year and vehicle value loss per mile.
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Car affordability
Work backward from a monthly payment to an affordable vehicle price with APR, tax, fees and cash credits.
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EV charging cost
Calculate charging cost, wall energy, charging losses, time, range added and electricity cost per mile.
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Commute cost
Calculate daily, monthly and annual driving costs with gas, parking, tolls and vehicle wear.
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Car loan
Estimate monthly payments, total interest and the repayment schedule.
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Car refinance
Compare a current and new auto loan, monthly savings, total interest and break-even time.
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Auto loan payoff
Estimate payoff time and interest savings from extra auto loan payments.
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Car leasing
Estimate the deposit, monthly payments, residual value and total contract cost.
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Out-the-door price
Add vehicle price, sales tax, dealer fees, registration, trade-in and down payment.
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Mileage reimbursement
Calculate reimbursement from business miles, a custom per-mile rate, parking, tolls and other expenses.
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Driving time
Estimate driving time from distance and average speed, then add planned stops and traffic delay.
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Cost of car ownership
Estimate depreciation, financing and operating expenses per year, month and mile.
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Negative equity
Calculate a trade-in shortfall, rolled balance, new amount financed and loan-to-value ratio.
Open calculatorElectric vehicles
Gas vs. electric cost
Compare purchase price, energy and maintenance costs and estimate EV break-even time.
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Lease vs. buy
Compare leasing and financing over the same period using vehicle equity, loan balance and mileage.
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