Free car tools
Calculators and lookups for people who wrench on their own cars and drive them hard. Everything runs in your browser. Free, no signup.
Buying
- VIN Decoder & Recall CheckYear, engine, plant, recalls and complaint count from a VIN.
- Car Recall LookupEvery NHTSA recall for any year, make and model.
- Tire Date Code (DOT) DecoderHow old are those tires? Decode the DOT week/year.
- MPG Calculator & Fuel CostReal MPG vs EPA rating, and yearly fuel cost.
- Used Car Inspection ChecklistTick it off at the viewing or print it.
Wheels & tires
Gearing & performance
Engine
- Horsepower, Torque & Wheel HP CalculatorTorque ↔ hp, and wheel hp ↔ crank hp.
- Engine Displacement Calculatorcc, liters and cubic inches from bore and stroke.
- Compression Ratio CalculatorStatic CR from chamber, gasket, deck and piston.
- Fuel Injector Size CalculatorInjector cc/min for a power goal, gas or E85.
- Boost & Pressure Ratio CalculatorPressure ratio and absolute MAP, altitude-corrected.
Suspension & track
- Corner Weight & Cross Weight CalculatorCross weight and splits from four scale readings.
- Spring Rate, Wheel Rate & Ride Frequency CalculatorWheel rate and ride frequency from spring rate.
- Brake Bias CalculatorBias from pistons, rotors and pads; check a BBK first.
- Toe Alignment ConverterToe in degrees, inches or mm, total or per wheel.
- Track Day Cost CalculatorReal cost per day and per season, wear included.