Engine & drivetrain calculators

Choose a tool, enter your numbers, and follow the calculation.

Calculate engine swept volume in liters, cubic centimeters, and cubic inches from bore and stroke.

Calculate horsepower from torque or torque from power at a given RPM. Supports lb-ft, N·m, mechanical hp, kW, and metric PS.

Calculate engine RPM from mph or km/h, tire diameter in inches or millimeters, transmission gear, and final drive ratio.

Calculate static engine compression ratio from bore, stroke and total clearance volume per cylinder, with metric or inch dimensions.

Calculate mean piston speed in meters per second and feet per minute from engine RPM and stroke in millimeters or inches.

Calculate connecting-rod length divided by crankshaft stroke in millimeters or inches. Distinguish rod-to-stroke from rod-to-crank-radius ratio.