Learn About Horsepower
Clear, accurate guides to the math and physics behind every horsepower number.
Horsepower, torque, RPM, drivetrain loss — the numbers on a spec sheet only make sense once you understand the relationships behind them. These guides explain the physics in plain language and link to the calculators that put each concept to work.
Start With the Fundamentals
If you are new to engine power, begin with horsepower vs torque to understand the two core numbers, then read the 5252 rule to see exactly how they connect. Once you grasp those, wheel HP vs crank HP explains why a dyno reads lower than the brochure — one of the most common points of confusion among enthusiasts.
Frequently Asked Questions
One mechanical horsepower equals 33,000 foot-pounds of work per minute, or about 745.7 watts. James Watt defined it to compare steam engines with draft horses.
Start with horsepower vs torque, then the 5252 rule, then wheel HP vs crank HP. Together they cover the fundamentals most enthusiasts ask about.
Yes. Each guide explains the concept in plain language first, then adds the formulas and examples, so no prior engineering knowledge is needed.
Yes. Every guide links to the relevant calculator so you can apply the concept immediately after reading about it.
Read horsepower vs torque first, then the 5252 rule. Together they explain almost every horsepower question you'll encounter.