watts to hp | Exact Decimal + Formula

1 Watt = 0.001341 Horsepower (HP)

One horsepower equals about 746 watts (exactly 745.699872 W). Real-world use: light-bulb brightness ratings, appliance power consumption, and audio output. This page expresses those values in horsepower, which is used for car engines, electric motors, and HVAC equipment ratings. Type a value above for an instant answer; the exact formula and the reference table are below.

About Watt and Horsepower (HP)

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.

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.

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Precision

Formula

hp = W × 0.001341022

To convert Watt to Horsepower (HP), use the formula displayed above.

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Watt to Horsepower (HP): Quick Reference Table

Watt	Horsepower (HP) (Decimal)	Fraction	Real-world equivalent
0.001 W	0.000001 hp	-	fractional unit measurement
0.01 W	0.000013 hp	-	fractional unit measurement
0.1 W	0.000134 hp	-	fractional unit measurement
0.5 W	0.000671 hp	-	fractional unit measurement
1 W	0.001341 hp	-	fractional unit measurement
2 W	0.002682 hp	-	fractional unit measurement
5 W	0.006705 hp	-	fractional unit measurement
10 W	0.01341 hp	-	fractional unit measurement
25 W	0.033526 hp	-	fractional unit measurement
50 W	0.067051 hp	-	fractional unit measurement
100 W	0.134102 hp	-	fractional unit measurement
250 W	0.335256 hp	-	fractional unit measurement
500 W	0.670511 hp	-	fractional unit measurement
1000 W	1.341022 hp	-	standard single unit scale

W to hp Formula and Examples

Direct Formula hp = W × 0.001341022

Inverse Formula W = hp × 745.699872

Mental Math Shortcut

Divide the value by roughly 745.7 to quickly estimate the converted result.

Common Watt to Horsepower (HP) Calculations

5 W = 0.006705 hp
10 W = 0.01341 hp
50 W = 0.067051 hp
100 W = 0.134102 hp
500 W = 0.670511 hp

Precision & Practical Use

For example, 10 W = 0.01341 hp — roughly fractional unit measurement.

Appliance and engine ratings are typically whole watts, kilowatts, or horsepower. One decimal is plenty for comparisons.

How to Convert Watt to Horsepower (HP)

How many horsepower (hp)s are in one watt?

One Watt (W) equals 0.001341 Horsepower (HP) (hp). To convert watts to horsepower (hp)s, multiply the watt value by 0.001341.

How do I convert Watt to Horsepower (HP)?

Multiply your watt value by 0.001341 to get the result in Horsepower (HP): hp = W × 0.001341. For example, 5 W = 0.006705 hp.

What is the formula for converting W to hp?

The conversion formula is hp = W × 0.001341. 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 W to hp?