Horsepower Calculator
Convert engine torque and RPM into horsepower.
Amortization schedule
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Showing first 12 of months.
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Introduction
Horsepower Calculator — Convert engine torque and RPM into horsepower. Enter Torque (lb-ft), RPM to get an instant, accurate result.
Formula
Horsepower = torque (lb-ft) × RPM / 5252 — the constant where torque and horsepower curves always cross.
Step-by-step
- Enter the Torque (lb-ft).
- Enter the RPM.
- Click Calculate to see your result instantly.
Real-world example
Example: With Torque (lb-ft) = 300, RPM = 5000, the Horsepower Calculator gives a result of 285.6055.
Frequently Asked Questions
Why 5252 specifically?
It falls out of the unit conversion between torque, angular speed, and horsepower (1 hp = 33,000 ft-lb/min); at 5252 RPM, horsepower and torque numbers are always numerically equal.
Does more torque always mean more horsepower?
No — horsepower depends on both torque and RPM, so a lower-torque engine spinning at much higher RPM can produce more horsepower than a higher-torque, low-revving one.
What inputs does the Horsepower Calculator need?
You'll need to provide: Torque (lb-ft), RPM. All fields use sensible defaults, so you can see a working example immediately and then adjust the values to match your own numbers.
How accurate is the Horsepower Calculator?
The Horsepower Calculator applies the formula exactly as calculated — Horsepower = torque (lb-ft) × RPM / 5252 — the constant where torque and horsepower curves always cross. — so results are precise for the inputs you provide. Accuracy depends on entering correct, realistic input values.
Is the Horsepower Calculator free to use?
Yes, the Horsepower Calculator is completely free, requires no signup, and runs instantly in your browser.
About the Horsepower Calculator
The Horsepower Calculator uses a real, verifiable formula — Horsepower = torque (lb-ft) × RPM / 5252 — the constant where torque and horsepower curves always cross. — so results are accurate every time, not an approximation.