Watts to Horsepower Converter
Convert watts to horsepower instantly with this free watts to horsepower converter. Enter any value to get an accurate power conversion, plus the formula, the conversion factor and a full reference table.
What is 1 watt in horsepower?
1 watt is equal to 0.001341022 horsepower.
1 ÷ 745.699872 = 0.001341022 horsepower
1 watt = 0.0013410221 horsepower
Watts to Horsepower formula
hp = W ÷ 745.699872
The watts to horsepower conversion factor is 0.00134102209 (rounded). 1 watt = 0.00134102209 horsepower, and 1 horsepower = 745.699871582 watts.
Regional note. Mechanical horsepower (745.7 W) and metric horsepower / PS (735.5 W) differ by about 1.4%. This page uses mechanical horsepower.
Worked examples
- 2 watts = 0.002682044 horsepower — 2 ÷ 745.699872 = 0.002682044 horsepower
- 6 watts = 0.008046133 horsepower — 6 ÷ 745.699872 = 0.008046133 horsepower
- 10 watts = 0.013410221 horsepower — 10 ÷ 745.699872 = 0.013410221 horsepower
Watts to Horsepower conversion table
Every value below is calculated with the exact conversion factor and rounded for display.
| Watts (W) | Horsepower (hp) |
|---|---|
| 1 W | 0.00134102 hp |
| 2 W | 0.00268204 hp |
| 3 W | 0.00402307 hp |
| 4 W | 0.00536409 hp |
| 5 W | 0.00670511 hp |
| 6 W | 0.00804613 hp |
| 7 W | 0.00938715 hp |
| 8 W | 0.01072818 hp |
| 9 W | 0.0120692 hp |
| 10 W | 0.01341022 hp |
| 12 W | 0.01609227 hp |
| 15 W | 0.02011533 hp |
| 20 W | 0.02682044 hp |
| 25 W | 0.03352555 hp |
| 30 W | 0.04023066 hp |
| 50 W | 0.0670511 hp |
| 75 W | 0.10057666 hp |
| 100 W | 0.13410221 hp |
| 500 W | 0.67051104 hp |
| 1,000 W | 1.3410221 hp |
When you need to convert watts to horsepower
- Comparing engine or motor output quoted in horsepower, metric horsepower or kilowatts.
- Sizing heating and cooling equipment rated in BTU per hour or watts.
Common mistakes to avoid
- Dividing when you should multiply. Because 1 watt = 0.001341 horsepower, the answer should be smaller than the number you started with.
- Rounding too early. Convert first at full precision, then round the final answer to the precision the task actually needs.
How precise does the answer need to be?
Round only at the end, and only to the precision your task actually needs. The converter above keeps full double precision internally and rounds for display.
How these units are defined
- Watt (W): The SI unit of power: one joule per second. This unit's relationship to the SI base unit is exact by definition, so no rounding enters the conversion factor.
- Horsepower (hp): Mechanical horsepower: exactly 550 foot-pounds per second. The accepted value is a measured or conventional figure rather than an exact definition, so the factor shown is rounded.
Related conversions
Frequently asked questions
- What is 1 watt in horsepower?
- 1 watt is equal to 0.001341022 horsepower.
- How many watts are in one horsepower?
- There are 745.699872 watts in 1 horsepower.
- How do you convert watts to horsepower?
- Multiply the number of watts by 0.001341022 — or use the formula hp = W ÷ 745.699872.
- What is 6 watts in horsepower?
- 6 watts is 0.008046133 horsepower. 6 ÷ 745.699872 = 0.008046133 horsepower.
- Is the watts to horsepower conversion exact?
- The factor 0.00134102209 is a rounded value because at least one of these units is defined by measurement rather than by an exact definition.
- Does this use US or Imperial horsepower?
- Mechanical horsepower (745.7 W) and metric horsepower / PS (735.5 W) differ by about 1.4%. This page uses mechanical horsepower.