Automotive Calculators
Built for the Shop

Calculate engine volumetric efficiency from displacement, RPM, and measured airflow. Supports MAF and MAP-based calculations.

Calculate static compression ratio from bore, stroke, chamber volume, head gasket, deck clearance, and piston dome or dish volume.

Calculate required fuel injector size from target horsepower, BSFC, number of injectors, and maximum duty cycle. Results in lb/hr and cc/min.

Convert between air/fuel ratio and lambda for gasoline, E85, methanol, and diesel. Includes target ranges for idle, cruise, and WOT.

Convert between horsepower and torque at a given RPM. Also calculate HP from trap speed or ET and vehicle weight.