Horsepower to Watts (hp to W) Converter
1 horsepower (hp) = 745.7 watts (W). To convert horsepower to watts, multiply by 745.7: 150 hp × 745.7 = 111,855 W.
Quick facts
- 1 hp = 745.7 W
- 1 W = 0.00134102 hp
- Formula: W = hp × 745.7
- Quick estimate: multiply by about 746
How to convert horsepower to watts
- Take the value in horsepower.
- Multiply it by 745.7 (the number of watts in one horsepower).
- Round the result to the precision you need.
Worked example (a family car engine): 150 hp × 745.7 = 111855 W.
To convert watts back to horsepower, multiply by 0.00134102, or divide by 745.7.
Source: NIST SP 811 (2008), Appendix B (mechanical horsepower and international-table BTU).
Horsepower to Watts conversion table
| Horsepower [hp] | Watts [W] |
|---|---|
| 0.01 hp | 7.4569987158 W |
| 0.1 hp | 74.5699871582 W |
| 1 hp | 745.6998715823 W |
| 2 hp | 1491.3997431645 W |
| 3 hp | 2237.0996147468 W |
| 5 hp | 3728.4993579114 W |
| 10 hp | 7456.9987158227 W |
| 20 hp | 14913.9974316454 W |
| 50 hp | 37284.9935791135 W |
| 100 hp | 74569.987158227 W |
| 1000 hp | 745699.8715822703 W |
hp to W chart from 1 to 100
- 1 hp 745.7 W
- 2 hp 1491.4 W
- 3 hp 2237.1 W
- 4 hp 2982.8 W
- 5 hp 3728.5 W
- 6 hp 4474.2 W
- 7 hp 5219.9 W
- 8 hp 5965.6 W
- 9 hp 6711.3 W
- 10 hp 7457 W
- 11 hp 8202.7 W
- 12 hp 8948.4 W
- 13 hp 9694.1 W
- 14 hp 10439.8 W
- 15 hp 11185.5 W
- 16 hp 11931.2 W
- 17 hp 12676.9 W
- 18 hp 13422.6 W
- 19 hp 14168.3 W
- 20 hp 14914 W
- 25 hp 18642.5 W
- 30 hp 22371 W
- 35 hp 26099.5 W
- 40 hp 29828 W
- 45 hp 33556.5 W
- 50 hp 37285 W
- 55 hp 41013.5 W
- 60 hp 44742 W
- 65 hp 48470.5 W
- 70 hp 52199 W
- 75 hp 55927.5 W
- 80 hp 59656 W
- 85 hp 63384.5 W
- 90 hp 67113 W
- 95 hp 70841.5 W
- 100 hp 74570 W
Watts to Horsepower conversion table
| Watts [W] | Horsepower [hp] |
|---|---|
| 0.01 W | 0.0000134102 hp |
| 0.1 W | 0.0001341022 hp |
| 1 W | 0.0013410221 hp |
| 2 W | 0.0026820442 hp |
| 3 W | 0.0040230663 hp |
| 5 W | 0.0067051104 hp |
| 10 W | 0.0134102209 hp |
| 20 W | 0.0268204418 hp |
| 50 W | 0.0670511045 hp |
| 100 W | 0.134102209 hp |
| 1000 W | 1.3410220896 hp |
Horsepower vs Watts
| Horsepower | Watt | |
|---|---|---|
| Symbol | hp | W |
| Equals | 1 hp = 745.7 W | 1 W = 0.00134102 hp |
What is a horsepower?
Originally defined to compare steam engines to draft horses. Used worldwide for engine and motor power ratings.
What is a watt?
The SI derived unit of power, equal to one joule per second. Used for electrical appliance and device power ratings.
Frequently asked questions
How many watts are in a horsepower?
There are 745.7 watts in 1 horsepower (1 hp = 745.6998715823 W).
How many horsepower are in a watt?
There are 0.00134102 horsepower in 1 watt (1 W = 0.0013410221 hp).
How do I convert horsepower to watts?
Multiply the number of horsepower by 745.7. For example, 10 hp × 745.7 = 7,457 W. To convert back, multiply by 0.00134102.
What is 10 hp in watts?
10 hp = 7,457 W.
What is 100 hp in watts?
100 hp = 74,570 W.
Is the conversion exact?
Yes. The factor comes from the official definitions of both units (NIST SP 811 (2008), Appendix B (mechanical horsepower and international-table BTU)). Results are shown to up to 10 decimal places; round them to suit your purpose.
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