Auto Tools
Free automotive tools and calculators: decode a VIN, size up a car loan, work out fuel cost and MPG, compare tire sizes and wheel offsets, check towing capacity and estimate depreciation. Built by car people, free to use.
8 auto tools
Decode VINs and run the numbers on your vehicle.
VIN Decoder
Decode any 17-character VIN instantly.
Car Loan Calculator
Estimate your car payment with tax and trade-in.
Fuel Cost Calculator
Work out the fuel cost of any trip.
MPG Calculator
Calculate real-world fuel economy.
Tire Size Calculator
Compare tire sizes and speedometer error.
Wheel Offset Calculator
See how new wheels sit vs your current setup.
Towing Capacity Calculator
Find your safe maximum trailer weight.
Vehicle Depreciation Calculator
Estimate what your car will be worth.
Frequently asked questions
Yes. Every tool is completely free, with no sign-up and no usage limits.
Tools run in your browser wherever possible, so your data stays on your device.
No installation is required — everything works instantly in your web browser.