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 tool runs entirely in your browser. Your files are never uploaded to a server.
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.