hp to watts | Exact Decimal + Formula
1 Horsepower (HP) = 745.699872 Watt
One horsepower equals about 746 watts (exactly 745.699872 W). Real-world use: car engines, electric motors, and HVAC equipment ratings. This page expresses those values in watts, which is used for light-bulb brightness ratings, appliance power consumption, and audio output. Type a value above for an instant answer; the exact formula and the reference table are below.
About Horsepower (HP) and Watt
Horsepower (HP) (hp)
One horsepower is about 745.7 watts, originally defined as the work a strong horse can sustain.
Where it's used: Car engines, electric motors, and HVAC equipment ratings.
Watt (W)
The watt is the SI unit of power — one joule of energy per second.
Where it's used: Light-bulb brightness ratings, appliance power consumption, and audio output.
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Formula
W = hp × 745.699872
To convert Horsepower (HP) to Watt, use the formula displayed above.
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Horsepower (HP) to Watt: Quick Reference Table
| Horsepower (HP) | Watt (Decimal) | Fraction |
|---|---|---|
| 0.001 hp | 0.7457 W | - |
| 0.01 hp | 7.456999 W | - |
| 0.1 hp | 74.569987 W | - |
| 0.5 hp | 372.849936 W | - |
| 1 hp | 745.699872 W | - |
| 2 hp | 1491.399744 W | - |
| 5 hp | 3728.49936 W | - |
| 10 hp | 7456.99872 W | - |
| 25 hp | 18642.4968 W | - |
| 50 hp | 37284.9936 W | - |
| 100 hp | 74569.9872 W | - |
| 250 hp | 186424.968 W | - |
| 500 hp | 372849.936 W | - |
| 1000 hp | 745699.872 W | - |
hp to W Formula and Examples
Direct Formula
W = hp × 745.699872 Inverse Formula
hp = W × 0.001341 Mental Math Shortcut
Multiply the value by roughly 745.7 to calculate the equivalent amount in your head.
Common Horsepower (HP) to Watt Calculations
- 5 hp = 3728.49936 W
- 10 hp = 7456.99872 W
- 50 hp = 37284.9936 W
- 100 hp = 74569.9872 W
- 500 hp = 372849.936 W
Precision & Practical Use
For example, 10 hp = 7456.99872 W — roughly multiple unit increments.
Appliance and engine ratings are typically whole watts, kilowatts, or horsepower. One decimal is plenty for comparisons.
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How to Convert Horsepower (HP) to Watt
How many watts are in one horsepower (hp)?
One Horsepower (HP) (hp) equals 745.699872 Watt (W). To convert horsepower (hp)s to watts, multiply the horsepower (hp) value by 745.699872.
How do I convert Horsepower (HP) to Watt?
Multiply your horsepower (hp) value by 745.699872 to get the result in Watt: W = hp × 745.699872. For example, 5 hp = 3728.49936 W.
What is the formula for converting hp to W?
The conversion formula is W = hp × 745.699872. Use the calculator above for any value, and see the reference table below for common inputs from 0.001 to 1000.
Is there a quick mental estimate for hp to W?
Multiply the value by roughly 745.7 to calculate the equivalent amount in your head.
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