Power Converter
Convert horsepower, kilowatts, watts, BTU per hour and tons of refrigeration.
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- Result
- Formula
- Reverse
- Exact?
In Every Unit
| Unit | Value |
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How to Convert Power Units
Power is energy per unit time; one watt is one joule per second. Mechanical horsepower is 550 foot-pounds per second, about 745.7 W.
kW = hp × 0.7457 BTU/h = W × 3.41214 1 ton = 12,000 BTU/h = 3.517 kW
Worked Example
Common Conversions
| From | Equals |
|---|---|
| 1 hp | 0.7456999 kW |
| 1 kW | 1.341022 hp |
| 1 W | 3.412142 BTU/h |
| 1 BTU/h | 0.2930711 W |
| 1 TR | 3.516853 kW |
| 1 TR | 12,000 BTU/h |
| 1 PS | 0.9863201 hp |
Unit Definitions
| Unit | Equals | Exact? |
|---|---|---|
| Watts (W) | 1 W | Exact |
| Kilowatts (kW) | 1,000 W | Exact |
| Megawatts (MW) | 1,000,000 W | Exact |
| Horsepower (mechanical) (hp) | 745.6998716 W | Exact |
| Metric horsepower (PS) (PS) | 735.49875 W | Exact |
| Electrical horsepower (hp(E)) | 746 W | Exact |
| BTU per hour (BTU/h) | 0.2930710702 W | Exact |
| Tons of refrigeration (TR) | 3,516.852842 W | Exact |
| Foot-pounds per second (ft·lbf/s) | 1.355817948 W | Exact |
| Kilocalories per hour (kcal/h) | 1.162222222 W | Exact |
Factors follow NIST Special Publication 811, Appendix B. "Exact" means the unit is defined as that value; results are rounded only for display.
Tips
European car specs often use metric horsepower (PS), about 1.4% smaller than US horsepower. Motor nameplates use 746 W per electrical horsepower.