Free, no sign-up, runs in your browser
Static, dynamic and boosted CR from bore, stroke, chamber, gasket and piston.
Open the calculatorBore × stroke × cylinders to cc, litres and cubic inches, with overbore, and a cc to cubic inch converter.
Open the calculatorSolve bore or stroke for a target size, the ratio, and piston speed at redline.
Open the calculatorTorque and rpm to hp, kW and PS, power from a quarter-mile run, wheel to crank, or an estimate from displacement.
Open the calculatorSAE, STD, DIN and EC corrected power from one reading.
Open the calculatorGears, final drive and tyre size to speed and rpm in every gear, or gear teeth to ratio and torque.
Open the calculatorEvery formula on these pages is the same one everyone else uses. What the others do not have is an engine to check it against. Each calculator reads the simulator's roster: real bore, stroke, compression ratio and induction for every preset, and the peak the simulator's dyno measured for it. A reader who types a 7.0-litre V8 sees what the LS7 in the roster makes and can run it.
The measured figures are the simulator's, at fixed air, and the presets marked "same as" reproduce a published rating within 5 %. Where the model is still being calibrated the page says so.