Online Tool Store
Torque to Horsepower Converter
Convert torque (lb-ft or Nm) and engine RPM into horsepower using the standard SAE formula, with both US and metric units shown side by side. Runs entirely in your browser.
This works right here on your device — nothing gets sent out.
Example
Torque to Horsepower Converter
- Torque
- 300 lb-ft
- Engine speed
- 4,000 RPM
Example shown — replace it with your own torque and RPM.
Result
How it works
- Enter the torque value and the engine or motor's RPM.
- The tool applies the standard torque-to-horsepower formula.
- The result appears instantly, ready to copy.
The formula
Horsepower is torque multiplied by rotational speed, scaled by a fixed constant:
HP = Torque (lb-ft) × RPM / 5252
Example: 300 lb-ft at 4,000 RPM gives 300 × 4000 / 5252 ≈ 228.5 hp.
FAQ
What formula does this use?
Horsepower = Torque (lb-ft) × RPM / 5252 for imperial units, or Torque (Nm) × RPM / 9549 for metric — the standard SAE conversion used across the automotive and engineering industries.
Why 5252 specifically?
It falls out of the unit conversion between lb-ft, RPM, and horsepower (33,000 ft-lb/min ÷ 2π). It also happens to be the RPM where a torque curve and horsepower curve always cross on a dyno chart.
Does this account for drivetrain losses?
No — this converts crankshaft (or measured) torque and RPM directly to horsepower. Wheel horsepower after drivetrain losses is typically 10-20% lower and needs a separate adjustment.
How we compare
| Feature | Online Tool Store | Manufacturer spec sheet lookup | Manual formula in a spreadsheet |
|---|---|---|---|
| No spreadsheet setup | Yes | N/A | Manual |
| Works for any torque/RPM pair | Yes | Fixed values only | Yes |
| Instant, in-browser result | Yes | N/A | Recalculate each time |
For a one-off torque-to-horsepower conversion, this beats digging up a spec sheet or rebuilding the formula in a spreadsheet.