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Horsepower to Watt Converter

Enter the value that you want to convert horsepower (hp) to watt (W) or watt to horsepower.Also written as HP to W conversion.

1 horsepower = 735.4987500 watt

Formula: watt = horsepower value × 735.4987500

HP to W — horsepower to watt

hp
7354.98750W

10 horsepower = 7354.98750 watt

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Converting Horsepower to Watt

The Horsepower in Engineering

Horsepower (hp) is a unit of power measurement. 1 horsepower is equal to 735.4987500 watt.

About the Watt

Watt (W) is a unit of power measurement. 1 watt is equal to 0.0013596 horsepower.

Power Measurement Across Applications

Power units span from milliwatts in electronics to megawatts in power plants. Engine output is still quoted in horsepower (mechanical, metric, and electrical — all slightly different). HVAC systems rate cooling in tons of refrigeration or BTU/hour. Solar panels specify watts peak. Electric motors list watts or kilowatts. Each industry carries its historical unit preferences, making conversion between them a daily necessity.

horsepower to watt metric conversion table

0.01 hp=7.35499 W
0.1 hp=73.54988 W
1 hp=735.49875 W
2 hp=1470.99750 W
3 hp=2206.49625 W
4 hp=2941.99500 W
5 hp=3677.49375 W
6 hp=4412.99250 W
7 hp=5148.49125 W
8 hp=5883.99000 W
9 hp=6619.48875 W
10 hp=7354.98750 W
11 hp=8090.48625 W
12 hp=8825.98500 W
13 hp=9561.48375 W
14 hp=10296.98250 W
15 hp=11032.48125 W
16 hp=11767.98000 W
17 hp=12503.47875 W
18 hp=13238.97750 W
19 hp=13974.47625 W
20 hp=14709.97500 W
30 hp=22064.96250 W
40 hp=29419.95000 W
50 hp=36774.93750 W
60 hp=44129.92500 W
70 hp=51484.91250 W
80 hp=58839.90000 W
90 hp=66194.88750 W
100 hp=73549.87500 W
200 hp=147099.75000 W
300 hp=220649.62500 W
400 hp=294199.50000 W
500 hp=367749.37500 W
600 hp=441299.25000 W
700 hp=514849.12500 W
800 hp=588399.00000 W
900 hp=661948.87500 W
1000 hp=735498.75000 W

How to Convert HP to W (Horsepower to Watt)?

We can convert horsepower to watt by using an example.

Example:

Convert 20 Horsepower to Watt?

We know 1 Horsepower = 735.4987500 watt; 1 Watt = 0.0013596 horsepower.

20 horsepower = ___W

20 × 735.4987500 = 14709.97500 W (we know 1 horsepower = 735.4987500 watt)

Answer:

20 horsepower = 14709.97500 watt

Metric Horsepower (PS) to Watts: The European Standard

Metric horsepower — abbreviated PS (Pferdestärke in German), CV (France/Italy), or simply "metric hp" — differs slightly from mechanical horsepower. One metric horsepower equals 735.5 watts (vs. 745.7 W for mechanical hp). This distinction matters in European automotive specifications, where PS is the traditional unit.

  1. Start with the power value in metric horsepower (PS).
  2. Multiply by 735.5 to get watts.
  3. For kilowatts, divide the result by 1,000 (or multiply PS by 0.7355).
  4. The result is the electrical power in watts.
💡 Tip: The difference between metric and mechanical hp is only 1.4%. A 200 PS engine is 147.1 kW (metric) vs. 149.1 kW if it were 200 mechanical hp. For most practical purposes, the difference is negligible.

Metric HP (PS) to Watts: European Vehicle Reference

European car power ratings in PS converted to watts:

HorsepowerWatt
1 PS735.5 W
75 PS55,163 W
100 PS73,550 W
150 PS110,325 W
200 PS147,100 W
300 PS220,650 W
500 PS367,750 W
1,000 PS735,500 W

Solved Examples: Metric HP to Watts

Question 1: A BMW M3 produces 510 PS. Convert to watts and kilowatts.

Solution:

Watts = PS × 735.5

= 510 × 735.5

= 375,105 W

= 375.1 kW

Answer: 510 PS = 375,105 W = 375.1 kW.

Question 2: A Volkswagen Golf is rated at 150 PS. Express in watts.

Solution:

Watts = PS × 735.5

= 150 × 735.5

= 110,325 W

Answer: 150 PS = 110,325 W (110.3 kW).

Question 3: A Bugatti Chiron produces 1,500 PS. What is that in watts?

Solution:

Watts = PS × 735.5

= 1,500 × 735.5

= 1,103,250 W

= 1,103.25 kW

Answer: 1,500 PS = 1,103,250 W = approximately 1.1 MW — more than a megawatt!

Practice: Metric HP (PS) to Watts

Try solving these on your own to test your understanding:

  1. Convert 90 PS to watts. (Answer: 66,195 W)
  2. A Renault Megane has 225 PS. Express in watts. (Answer: 165,488 W)
  3. Convert 400 PS to kW. (Answer: 294.2 kW)
  4. An Audi RS6 produces 600 PS. What is that in watts? (Answer: 441,300 W)
  5. A moped is rated at 5 PS. Convert to watts. (Answer: 3,678 W)

PS vs. HP: Why Two Definitions Exist

Mechanical (Imperial) horsepower was defined by James Watt using foot-pounds (33,000 ft·lbf/min = 745.7 W). Metric horsepower was later defined as the power to raise 75 kilograms by 1 meter in 1 second (75 kgf·m/s = 735.5 W). The 1.4% difference arises from the different force definitions (pound-force vs. kilogram-force) and unit systems. Since 1972, the EU officially uses kilowatts, but PS persists in marketing.

Where You Will Encounter PS Ratings

PS is used in Germany, Austria, Switzerland, Netherlands, and Scandinavian countries. France and Italy use CV (chevaux-vapeur) which is identical to PS. Japanese car specs (馬力, bariki) also use the metric definition. When reading European car reviews, assume PS unless "bhp" (brake horsepower) is explicitly stated. A 300 PS car has 296 bhp — close enough that journalists often interchange them carelessly.

Key Takeaways

  • 1 metric hp (PS) = 735.5 watts.
  • Metric hp is 1.4% less than mechanical (Imperial) hp.
  • Used in European automotive specs (PS, CV, DIN horsepower).
  • Multiply PS by 735.5 to get watts, or by 0.7355 for kW.
  • Since 1972, EU officially uses kW but PS remains in marketing.

Horsepower to Watt Conversion Formula

watt = horsepower × 735.4987500

1 horsepower = 735.4987500 watt

1 watt = 0.0013596 horsepower

Reverse: horsepower = watt × 0.0013596

Frequently Asked Questions

How many watt are in 1 horsepower?

There are 735.4987500 watt in 1 horsepower. To convert horsepower to watt, multiply the value by 735.4987500.

How do I convert horsepower to watt?

Multiply your horsepower value by 735.4987500 to get the equivalent in watt. For example, 5 horsepower = 5 × 735.4987500 = 3677.49375 watt.

How do I convert watt to horsepower?

Multiply your watt value by 0.0013596 to get the equivalent in horsepower. Alternatively, divide by 735.4987500.

What is 10 horsepower in watt?

10 horsepower is equal to 7354.98750 watt.

What is 100 horsepower in watt?

100 horsepower is equal to 73549.87500 watt.