Apps
Free online car tools and calculators for DIY mechanics and vehicle owners. Use these apps to estimate fuel costs, compare tire sizes, convert repair units, plan maintenance, check diagnostics, and solve common auto tasks online.
0-60 mph Calculator – Estimate Acceleration Time
0–60 mph Acceleration Estimator Estimate your car’s 0–60 mph / 0–100 km/h time from power and weight — labeled as estimates, not manufacturer data. 0–60....
5-Year Total Cost of Ownership Calculator
5-Year Total Cost of Ownership Calculate the true 5-year total cost of owning any vehicle — depreciation, fuel, insurance, maintenance, financing, and taxes combined. The....
Air & Cabin Filter Tracker — Miles Since Change
Air & Cabin Filter Life Tracker Track miles since your last engine air filter and cabin air filter change and predict when both are due.....
Air-Fuel Ratio Calculator – AFR & Lambda Converter
Air-Fuel Ratio Calculator Convert between AFR and Lambda, and check stoichiometric targets for petrol, E85, and diesel tuning. AFR / Lambda Converter AFR ⇄ Lambda....
ATF Type Guide – Automatic Transmission Fluid Compatibility
ATF Type Guide Select an automatic transmission fluid type to see its brand origin, compatible transmissions, and critical cross-compatibility notes. ATF Type Guide Select a....
Auto Loan Calculator — Payment & Total Cost
Auto Loan Calculator Calculate your monthly auto loan payment, total interest paid over the term, and the full lifetime cost of the loan. Compare different....
Auto LTV Calculator — Upside-Down Loan Check
Loan-to-Value Ratio Calculator Check if you’re upside-down on your car loan. Loan-to-value ratio (LTV) is the loan balance divided by the car’s current market value.....
Auto Refinance Calculator — Old vs New APR
Auto Refinance Savings Calculator Compare your current auto loan APR against a refinance rate and see exactly how much you’ll save over the remaining life....
Battery CCA Sizing — Right Cranking Amps
Battery CCA Sizing Calculator Pick the correct cold-cranking amps for your engine displacement and climate. Battery replacement is one of the most common car repairs....
Battery CCA vs Engine & Climate Score
Battery Cold-Cranking Index Score your car battery’s cold-cranking capability against your engine size and the lowest expected ambient temperature. If your CCA-to-displacement ratio is low....
