How many watts are in 1 horsepower?

1 hp equals 745.6998716 W. This is an exact conversion factor defined by NIST.

How do I convert horsepower to watts?

Multiply the value in hp by the conversion factor. For example, 10 hp = 7456.998716 W. Use our calculator above for instant results.

Is the horsepower to watts conversion exact?

Yes, this conversion is mathematically exact based on the international definition of these units (NIST SP 811).

Can I convert horsepower to watts offline?

Yes! OmniConvert runs entirely in your browser — no internet connection needed after the page loads. Your data never leaves your device, ensuring complete privacy.

What is the difference between horsepower and watts?

Horsepower (hp) and Watts (W) are both units of power but belong to different measurement systems. 1 hp = 745.6998716 W. Use the converter above to switch between them instantly.

Horsepower to Watts (hp → W) — Free Online Converter

hp → W Reference Table

hp	W
0.001 hp	0.7456998716 W
0.002 hp	1.491399743 W
0.003 hp	2.237099615 W
0.004 hp	2.982799486 W
0.005 hp	3.728499358 W
0.006 hp	4.474199229 W
0.007 hp	5.219899101 W
0.008 hp	5.965598973 W
0.009 hp	6.711298844 W
0.01 hp	7.456998716 W
0.02 hp	14.91399743 W
0.03 hp	22.37099615 W
0.04 hp	29.82799486 W
0.05 hp	37.28499358 W
0.06 hp	44.74199229 W
0.07 hp	52.19899101 W
0.08 hp	59.65598973 W
0.09 hp	67.11298844 W
0.1 hp	74.56998716 W
0.2 hp	149.1399743 W
0.3 hp	223.7099615 W
0.4 hp	298.2799486 W
0.5 hp	372.8499358 W
0.6 hp	447.4199229 W
0.7 hp	521.9899101 W
0.8 hp	596.5598973 W
0.9 hp	671.1298844 W
1 hp	745.6998716 W
1.5 hp	1118.549807 W
2 hp	1491.399743 W
2.5 hp	1864.249679 W
3 hp	2237.099615 W
3.5 hp	2609.949551 W
4 hp	2982.799486 W
4.5 hp	3355.649422 W
5 hp	3728.499358 W
5.5 hp	4101.349294 W
6 hp	4474.199229 W
6.5 hp	4847.049165 W
7 hp	5219.899101 W
7.5 hp	5592.749037 W
8 hp	5965.598973 W
8.5 hp	6338.448908 W
9 hp	6711.298844 W
9.5 hp	7084.14878 W
10 hp	7456.998716 W
11 hp	8202.698587 W
12 hp	8948.398459 W
13 hp	9694.098331 W
14 hp	10439.7982 W
15 hp	11185.49807 W
16 hp	11931.19795 W
17 hp	12676.89782 W
18 hp	13422.59769 W
19 hp	14168.29756 W
20 hp	14913.99743 W
25 hp	18642.49679 W
30 hp	22370.99615 W
35 hp	26099.49551 W
40 hp	29827.99486 W
45 hp	33556.49422 W
50 hp	37284.99358 W
55 hp	41013.49294 W
60 hp	44741.99229 W
65 hp	48470.49165 W
70 hp	52198.99101 W
75 hp	55927.49037 W
80 hp	59655.98973 W
85 hp	63384.48908 W
90 hp	67112.98844 W
95 hp	70841.4878 W
100 hp	74569.98716 W
120 hp	89483.98459 W
125 hp	93212.48395 W
130 hp	96940.98331 W
140 hp	104397.982 W
150 hp	111854.9807 W
160 hp	119311.9795 W
175 hp	130497.4775 W
180 hp	134225.9769 W
200 hp	149139.9743 W
225 hp	167782.4711 W
250 hp	186424.9679 W
275 hp	205067.4647 W
300 hp	223709.9615 W
350 hp	260994.9551 W
400 hp	298279.9486 W
450 hp	335564.9422 W
500 hp	372849.9358 W
600 hp	447419.9229 W
700 hp	521989.9101 W
750 hp	559274.9037 W
800 hp	596559.8973 W
900 hp	671129.8844 W
1000 hp	745699.8716 W
1200 hp	894839.8459 W
1250 hp	932124.8395 W
1500 hp	1118549.807 W
1750 hp	1304974.775 W
2000 hp	1491399.743 W
2500 hp	1864249.679 W
3000 hp	2237099.615 W
4000 hp	2982799.486 W
4500 hp	3355649.422 W
5000 hp	3728499.358 W
6000 hp	4474199.229 W
7000 hp	5219899.101 W
7500 hp	5592749.037 W
8000 hp	5965598.973 W
9000 hp	6711298.844 W
10000 hp	7456998.716 W
15000 hp	11185498.07 W
20000 hp	14913997.43 W
25000 hp	18642496.79 W
50000 hp	37284993.58 W
75000 hp	55927490.37 W
100000 hp	74569987.16 W

Values based on NIST SP 811 conversion factors

Why Convert Horsepower to Watts?

Converting between horsepower (hp) and watts (W) is one of the most common power conversions. Whether for engineering, cooking, travel, or science, knowing how to quickly convert hp to W saves time and prevents errors.

Power conversions (hp to W) are essential for automotive enthusiasts, electrical engineers, and athletes. Car buyers frequently convert horsepower to kilowatts to compare engine performance across international brands. In electrical engineering, sizing generators and motors requires consistent power units to prevent overloads and ensure compatibility. Cyclists and rowers use power meters to track output in watts, converting these figures to estimate calorie burn or compare efforts. Misinterpreting power ratings can result in buying underpowered equipment or damaging electrical systems, highlighting the need for accurate conversion tools.

How to Convert Horsepower to Watts

To convert horsepower to watts, use the following formula:

W = hp × 745.6998716

Example: 1 hp = 745.6998716 W

For example, 5 hp = 3728.499358 W, 10 hp = 7456.998716 W, and 100 hp = 74569.98716 W. For larger values, 1000 hp = 745699.8716 W. Conversely, 1 W = 0.00134102209 hp. Our calculator above performs this conversion instantly with full precision — no rounding errors.

Common Use Cases

James Watt's original unit definition: 1 hp = 745.6998716 W
A typical family sedan engine: 150 hp = 111854.9807 W
A small electric drill: 0.5 hp = 372.8499358 W
A riding lawn mower engine: 10 hp = 7456.998716 W

Common Mistakes to Avoid

kW vs kWh: kW is power (rate), kWh is energy (total used).
HP variations: Mechanical HP (~745.7W) vs Metric HP (~735.5W).
Apparent Power: Watts vs Volt-Amps (VA) differ due to power factor.

Pro Tips

LED bulbs: A 10W LED replaces a 60W incandescent (saves energy).
Appliance labels: Check the back label for Wattage to avoid overloading strips.
Solar panels: Ratings are 'Peak Watts' (ideal conditions), expect less in reality.

What is a Horsepower?

Horsepower (hp) is a unit of power. Mechanical horsepower is about 745.7 watts, while metric horsepower is roughly 735.5 watts.

Horsepower is the traditional unit for measuring the power of car engines and electric motors, particularly in the automotive industry.

What is a Watt?

The watt (W) is the SI derived unit of power. Defined as one joule per second. Named after James Watt.

Watts are used universally to measure the rate of energy transfer, commonly for light bulbs, electronics, and small appliances.

Horsepower → Watts

Horsepower to Watts Formula