Home & Life

Automotive & Vehicle Costs Calculators

Fuel cost per mile, towing, tires, depreciation, lease vs buy and performance. Free calculators with formulas and worked examples.

Auto

Trip Fuel Cost CalculatorEstimate the fuel and cost for a road trip, and split it between everyone in the car. Works in kilometres and litres, or miles…EV Charging Cost CalculatorWhat does a charge cost at home or on the road?Gas vs Electric Car Cost CalculatorHow much could you save per year by switching to electric?Car Depreciation CalculatorSee how fast a new car loses value.Tire Size CalculatorCheck how a new tire size changes diameter and speedometer reading.Quarter-Mile Horsepower CalculatorConvert a drag-strip time slip into an approximate power figure.Engine Displacement CalculatorSize an engine from its internal dimensions.Engine Compression Ratio CalculatorSwept volume plus clearance volume, over clearance volume.Gear Ratio Speed CalculatorHow fast are you going at a given RPM in a given gear?Gas Mileage CalculatorFill up, divide, and see what you really get.

Towing

Towing Capacity Calculator (GCWR, Tongue Weight and Payload)Enter your ratings and trailer weight to see whether you are within limits.Trailer Tongue Weight CalculatorEnter the loaded trailer weight, the hitch type and, if known, the measured tongue weight.

Running costs

Fuel Cost per Mile Calculator (Compare Two Vehicles)Enter the mileage and fuel price of two cars to compare their running cost.Tire Cost per Mile CalculatorEnter the price of a set, fitting costs and the expected tread life.Car Ownership Cost Calculator (Total Cost per Mile)Enter the purchase price, expected resale value and running costs.MPG Comparison Calculator (Fuel Savings Between Two Cars)Enter both cars' mpg, how far you drive and the fuel price.

Engine specs

Engine Displacement Converter (cc, Cubic Inches, Liters)Enter displacement and pick the unit to see cc, cubic inches and liters.

Performance

Horsepower to Weight Ratio CalculatorEnter horsepower and weight to get the performance ratio.Wheel Horsepower Calculator (Drivetrain Loss)Choose the direction and enter the horsepower and drivetrain loss.

Tires

Tire Pressure and Temperature CalculatorEnter the pressure you set and the temperatures to see the new tire pressure.

Buying a car

Lease vs Buy Car Calculator (Break-Even by Mileage)Enter lease and loan terms to see which is cheaper over the period.Car Depreciation Curve Calculator (Value by Year)Enter the price and depreciation rates to see the value curve.

Gearing

Gear Ratio Calculator for Bigger Tires (Off-Road)Enter your axle ratio and tire sizes to see the effect of a tire change.

Bodywork

Car Paint Quantity Calculator (Base, Clear and Primer)Choose your vehicle and coat settings to estimate paint quantities.

Maintenance

Brake Pad Wear Estimator (Remaining Life)Enter pad thickness now and miles since fitting to estimate remaining life.

Loan payments

Car Lease Payment CalculatorWork out a lease payment from its main components.

Mechanics

Stopping Distance CalculatorHow far does a vehicle travel before it stops?

Buying

Car Affordability Calculator (20/4/10 Rule)Enter your income, the loan rate and your expected running costs.Lease Mileage Calculator (Overage Cost)Enter the allowance, lease length, months so far and miles driven.

About these calculators

Costs and specs for people who own or buy vehicles: fuel and running cost, towing limits, tire and gear changes, depreciation, lease or buy and performance ratios. Check your owner's manual for official limits and ratings.

Each calculator explains its formula, includes a worked example and lists its sources. Read how we check them on our editorial policy page, or browse all calculators.

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Please note: TheCalcTools gives general estimates for information and education. It is not financial, medical, legal or tax advice, and results should be checked before you make a decision. See our disclaimer and about page.