Power and Energy
hptoW
Convert mechanical horsepower (hp) to watts (W).
Factor1 hp = 745.6999 W
Converter
hp
Accepts numbers or expressions, e.g. 150 + 14.7
Result
W
Rendered to 6 significant figures.
Formula
Formula
W = hp × 745.6999
Multiply any value in mechanical horsepower by 745.6999 to obtain the value in watts.
Worked example
Convert 10 hp to W.
- 01Start with 10 hp.
- 02Multiply by the conversion factor: 10 × 745.6999 = 7457 W.
Result10 hp = 7457 W
Conversion table
| hp | W |
|---|---|
| 1 | 745.7 |
| 2 | 1491.4 |
| 5 | 3728.5 |
| 10 | 7457 |
| 20 | 14914 |
| 50 | 37285 |
| 100 | 74570 |
| 200 | 1.4914e+5 |
| 500 | 3.7285e+5 |
| 1000 | 7.4570e+5 |
Reference values rounded to 5 significant figures for display.
FAQ
What is the conversion factor from hp to W?
1 hp equals 745.6999 W. To convert, multiply the value in mechanical horsepower by 745.6999.
How do I convert 1 hp to W?
1 hp = 745.7 W. For any value, multiply by 745.6999.
How do I convert W back to hp?
Divide by the same factor — or equivalently, multiply by 0.001341022. So 1 W = 0.00134102 hp.
When would I need to convert mechanical horsepower to watt?
Power conversions are common when comparing motor ratings (often kW or hp), thermal duty (BTU/hr or kW), and utility consumption in mixed-unit projects.
Is the conversion exact?
The factor shown is precise to at least 7 significant figures. For most process-engineering work this is far better than instrument accuracy. For metrology or trade applications, refer to the relevant national standard (NIST, BIPM, ISO 80000).