Automotive Calculators
Built for the Shop
Free, fast, mobile-friendly tools for diagnosticians, engine builders, and tuners. No signup required.
VE Calculator
engineCalculate engine volumetric efficiency from displacement, RPM, and measured airflow. Supports MAF and MAP-based calculations.
Compression Ratio
engineCalculate static compression ratio from bore, stroke, chamber volume, head gasket, deck clearance, and piston dome or dish volume.
Injector Sizing
fuelCalculate required fuel injector size from target horsepower, BSFC, number of injectors, and maximum duty cycle. Results in lb/hr and cc/min.
AFR / Lambda
fuelConvert between air/fuel ratio and lambda for gasoline, E85, methanol, and diesel. Includes target ranges for idle, cruise, and WOT.
HP / Torque
performanceConvert between horsepower and torque at a given RPM. Also calculate HP from trap speed or ET and vehicle weight.
All calculations run in your browser. No data is sent to any server.