The FREE & uncannily accurate Horsepower Calculator... No Software, No Cost.

Simply input your engine's stats, and calculate approximate peak Horsepower and the approximate RPM at which it occurs.

You no longer need expensive and overly-complicated software to calculate your engine's peak horsepower. Use this free calculator to see what your engine is capable of. Currently this calculator works for naturally aspirated engines (no turbos, no superchargers, no nitrous) running on pump gas. If we at GoFastMath.com see a demand for this horsepower calculator to also work for boosted engines, we will do our best to make that happen. Feel free to contact us with your suggestions, questions, comments, needs, etc..