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The free automotive toolbox: tires, wheels, mechanical and performance calculators, no account needed.
Tires & wheels
13Tires & wheelsTire Size CalculatorEnter a tire size (e.g. 225/45R17) to get its diameter, circumference and revolutions per mile or km.Calculate →Tires & wheelsTire Size ComparisonCompare two tire sizes side by side: diameter, ground clearance and speedometer impact.Calculate →Tires & wheelsSpeedometer Error CalculatorAfter a tire size change, find your real speed versus what the speedometer shows.Calculate →Tires & wheelsWheel Offset CalculatorCalculate backspacing, poke and offset (ET) for your wheels.Calculate →Tires & wheelsTire Diameter CalculatorOverall tire diameter in inches and mm from any tire size, plus sidewall height.Calculate →Tires & wheelsTire Circumference CalculatorRolling circumference of a tire in inches and mm, and revolutions per mile and per km.Calculate →Tires & wheelsTire Revolutions per Mile CalculatorHow many times a tire turns per mile and per km, from its size.Calculate →Tires & wheelsGround Clearance Difference CalculatorHow much ride height changes when switching from one tire size to another.Calculate →Tires & wheelsWheel Inner Clearance CalculatorHow much closer to (or further from) the suspension a new wheel sits compared with the current one.Calculate →Tires & wheelsWheel Poke CalculatorHow much further out a new wheel sticks past the fender compared with the current one.Calculate →Tires & wheelsWheel Backspacing CalculatorBackspacing in inches and mm from wheel width and offset (ET).Calculate →Tires & wheelsWheel Width & Offset ComparisonCompare two wheels: change in poke, inner clearance, offset and width.Calculate →Tires & wheelsInches ↔ mm Converter for Wheels & TiresConvert a rim diameter or wheel width between inches and millimetres.Calculate →
Fuel & trips
14Fuel & tripsFuel Consumption CalculatorDistance driven and fuel used: get your real-world economy in MPG, L/100 km and km/L.Calculate →Fuel & tripsL/100 km CalculatorLitres per 100 km from a fill-up and the distance driven, with the MPG equivalent.Calculate →Fuel & tripsMPG CalculatorMiles driven and US gallons used: your miles per gallon, with UK MPG and L/100 km equivalents.Calculate →Fuel & tripsMPG ↔ L/100 km ConverterConvert fuel economy between US MPG, UK MPG, L/100 km and km/L.Calculate →Fuel & tripsFuel Cost CalculatorDistance, fuel economy and price per gallon or litre: the fuel cost of a journey and the cost per mile.Calculate →Fuel & tripsTrip Fuel Cost CalculatorEstimate the fuel budget of a trip or road trip, one way or round trip.Calculate →Fuel & tripsFuel Needed CalculatorHow many gallons or litres you need to cover a distance at your car’s fuel economy.Calculate →Fuel & tripsFuel Range CalculatorHow many miles or km you can drive on a full tank, from tank size and fuel economy.Calculate →Fuel & tripsFuel Cost per KilometreWhat each kilometre costs you in fuel, from consumption and the price per litre.Calculate →Fuel & tripsFuel Cost per Mile CalculatorWhat each mile costs you in gas, from MPG and the price per gallon.Calculate →Fuel & tripsMonthly Fuel Cost CalculatorYour monthly miles, fuel economy and price: your fuel budget per month, week and year.Calculate →Fuel & tripsAnnual Fuel Cost CalculatorYearly mileage, fuel economy and price: what fuel costs you per year, per month and per mile.Calculate →Fuel & tripsSplit Fuel Cost CalculatorCarpool or road trip with friends: the share of fuel each person should pay.Calculate →Fuel & tripsCompare Fuel Economy of Two CarsTwo fuel economy figures, your yearly mileage and fuel price: the real saving per year.Calculate →
Electric vehicles
12Electric vehiclesEV Charging Time CalculatorBattery size, starting and target charge, charger power: how long your EV takes to charge.Calculate →Electric vehiclesEV Charging Cost CalculatorWhat one charge of your battery costs, at home or at a public charger, from the price per kWh.Calculate →Electric vehiclesEV Energy Needed CalculatorEnergy to add to the battery to go from one state of charge to another, including charging losses.Calculate →Electric vehicles10–80% EV Charging Time CalculatorHow long the classic 10→80% fast-charge session takes, from battery size and charging power.Calculate →Electric vehiclesEV Range CalculatorBattery capacity and consumption (mi/kWh or kWh/100 km): the real-world range of your EV.Calculate →Electric vehiclesRange Added per Hour of ChargingHow many miles or km one hour of charging gives you back, from charger power and your consumption.Calculate →Electric vehiclesEV Cost per 100 km CalculatorConsumption in kWh/100 km and price per kWh: what 100 km cost in an EV, and the cost per km.Calculate →Electric vehiclesEV Cost per Mile CalculatorMiles per kWh and electricity price: what each mile costs in an EV.Calculate →Electric vehiclesMonthly EV Charging Cost CalculatorYour monthly miles, consumption and electricity price: your monthly charging budget.Calculate →Electric vehiclesAnnual EV Charging Cost CalculatorYearly mileage, consumption and electricity price: what charging costs you per year and per month.Calculate →Electric vehiclesHome vs Public EV Charging Cost ComparisonCompare annual charging cost by your mix of home charging and public charging.Calculate →Electric vehiclesEV vs Gas Cost CalculatorAnnual energy cost of driving electric versus petrol, for the same mileage.Calculate →
Buying & financing
10Buying & financingAuto Loan CalculatorPrice, down payment, APR and term: your monthly payment, total interest and total cost of the loan.Calculate →Buying & financingCar Payment CalculatorLoan amount, APR and term: your monthly car payment and the total you will repay.Calculate →Buying & financingCar Loan Interest CalculatorHow much interest you will pay in total over the life of your car loan.Calculate →Buying & financingTotal Car Loan Cost CalculatorPrice, down payment, APR, term and fees: what the car really costs once the loan is paid off.Calculate →Buying & financingHow Much Car Can I Afford? CalculatorFrom the monthly payment you can handle, the APR and the term: the maximum vehicle price within reach.Calculate →Buying & financingCar Down Payment CalculatorDown payment amount from a percentage of the price, the amount left to finance and the resulting monthly payment.Calculate →Buying & financingCar Loan Term ComparisonMonthly payment and total interest for each term — see what a longer loan really costs.Calculate →Buying & financingCash vs Finance: Which Is Cheaper for a Car?Financing costs interest, but the cash you keep can earn a return — compare the net cost of both options.Calculate →Buying & financingLease vs Buy CalculatorLease payments and drive-off on one side, loan, down payment and resale value on the other: net cost over the same horizon.Calculate →Buying & financingCar Depreciation CalculatorPurchase price, annual depreciation rate and years: estimated resale value and value lost year by year.Calculate →
Cost of ownership
9Cost of ownershipCar Total Cost of Ownership (TCO) CalculatorDepreciation, financing, fuel, insurance and maintenance combined: what your car really costs per month, per year and per mile.Calculate →Cost of ownershipCar Cost CalculatorPurchase, fuel, insurance, maintenance and depreciation: your complete car budget, per month and per year.Calculate →Cost of ownershipMonthly Car Cost CalculatorAll in — depreciation, fuel, insurance, maintenance: what your car costs you every month.Calculate →Cost of ownershipAnnual Car Cost CalculatorDepreciation, fuel, insurance and maintenance: what your car costs you over a year.Calculate →Cost of ownershipTrue Cost per Kilometre of a CarAll costs included, what every kilometre really costs you — useful for expense claims and comparisons.Calculate →Cost of ownershipTrue Cost per Mile of a CarAll costs included, what every mile really costs you — depreciation, fuel, insurance and maintenance.Calculate →Cost of ownershipCommute Cost CalculatorDistance, working days, fuel economy, fuel price, parking and tolls: what your daily commute costs per month and per year.Calculate →Cost of ownershipCompare the Total Cost of Two CarsTwo cars, all costs included over your ownership period: which one really costs you less.Calculate →Cost of ownershipEV vs Gas Car: Total Cost of Ownership ComparisonPurchase, energy, insurance, maintenance and depreciation: which one really costs less over your ownership period.Calculate →
Mechanical & performance
13Mechanical & performanceHP to kW ConverterConvert horsepower (HP), metric horsepower (PS) and kilowatts (kW) instantly.Calculate →Mechanical & performanceEngine Displacement CalculatorBore × stroke × cylinder count: get displacement in cc, litres and cubic inches.Calculate →Mechanical & performancePower-to-Weight Ratio CalculatorEnter power and weight to get the ratio in kW/kg and hp per tonne.Calculate →Mechanical & performanceRPM to Speed CalculatorFrom engine RPM, gear ratio, final drive and tire size, calculate theoretical road speed.Calculate →Mechanical & performanceNm to lb-ft Torque ConverterConvert torque between newton-metres and pound-feet, both ways.Calculate →Mechanical & performanceBore and Stroke CalculatorStroke-to-bore ratio, displacement per cylinder and total: square, oversquare or undersquare engine.Calculate →Mechanical & performanceCC ↔ Litres ↔ Cubic Inches ConverterConvert engine displacement between cc, litres and cubic inches.Calculate →Mechanical & performanceMean Piston Speed CalculatorMean piston speed in m/s and ft/min from stroke and RPM — the key indicator of mechanical stress.Calculate →Mechanical & performanceWeight-to-Power Ratio CalculatorHow many kilograms each horsepower has to move: kg/hp and kg/kW, the inverse of power-to-weight.Calculate →Mechanical & performanceGear Ratio CalculatorGear ratio from the tooth count of the drive and driven gears, with the resulting speed reduction.Calculate →Mechanical & performanceFinal Drive Ratio CalculatorOverall ratio (gear × final drive) and road speed at a given RPM — compare final drives before you swap.Calculate →Mechanical & performanceSpeed to RPM CalculatorEngine RPM at a given road speed from gear ratio, final drive and tire size — cruising revs at a glance.Calculate →Mechanical & performanceSpeed by Gear CalculatorTheoretical speed in every gear at a given RPM (e.g. redline) from gearbox ratios, final drive and tire size.Calculate →