Car & Auto Calculators 2026

Car and auto calculators

A car is usually the second most expensive thing a household owns, and the easiest to underestimate, because the true cost is scattered across a loan payment, a fuel tank, an insurance renewal and a value that falls every single month. This shelf gathers the motoring calculators in one place so the whole cost of a car, buying it, fuelling it, charging it, maintaining it and eventually selling it, can be seen side by side before you sign anything at a dealership. That is the point of the shelf: a cheap loan on a thirsty car only reveals itself when the totals are compared honestly, line by line.

Each calculator separates the number dealers advertise from the number you will actually live with. Loan tools show total interest, not just the monthly payment; running cost tools use your mileage and your fuel price or electricity tariff, not national averages; and every page shows its formula and a worked example you can recompute yourself. Defaults cover the USA, the UK, Canada, Australia and Europe. Everything runs in your browser, free, and your figures never leave your device. Mileage, fuel prices and tariffs are all editable for the same reason: the honest answer for a rural high mileage driver and a city commuter on the same car can differ by thousands.

The Car Loan Calculator breaks a loan into payment, interest and total cost, and the Car Loan vs Lease Calculator puts buying and leasing on the same honest footing, mileage and residuals included. The Monthly Fuel Cost Calculator and EV Charging Cost Calculator price the daily drive in petrol or electrons, while the Car Depreciation Calculator shows what the car will be worth year by year. The Car Maintenance Cost Estimator budgets the servicing years, the Car Wrap Cost Calculator prices a colour change by vehicle size and finish, and the GAP Insurance Calculator tests whether a shortfall policy is worth its premium. Run them before signing anything at all.