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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 = 9809.5000000 watt

Formula: watt = horsepower value × 9809.5000000

HP to W — horsepower to watt

hp
98095.00000W

10 horsepower = 98095.00000 watt

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Horsepower vs Watt

The Horsepower in Engineering

Horsepower (hp) is a unit of power measurement. 1 horsepower is equal to 9809.5000000 watt.

About the Watt

Watt (W) is a unit of power measurement. 1 watt is equal to 0.0001019 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=98.09500 W
0.1 hp=980.95000 W
1 hp=9809.50000 W
2 hp=19619.00000 W
3 hp=29428.50000 W
4 hp=39238.00000 W
5 hp=49047.50000 W
6 hp=58857.00000 W
7 hp=68666.50000 W
8 hp=78476.00000 W
9 hp=88285.50000 W
10 hp=98095.00000 W
11 hp=107904.50000 W
12 hp=117714.00000 W
13 hp=127523.50000 W
14 hp=137333.00000 W
15 hp=147142.50000 W
16 hp=156952.00000 W
17 hp=166761.50000 W
18 hp=176571.00000 W
19 hp=186380.50000 W
20 hp=196190.00000 W
30 hp=294285.00000 W
40 hp=392380.00000 W
50 hp=490475.00000 W
60 hp=588570.00000 W
70 hp=686665.00000 W
80 hp=784760.00000 W
90 hp=882855.00000 W
100 hp=980950.00000 W
200 hp=1961900.00000 W
300 hp=2942850.00000 W
400 hp=3923800.00000 W
500 hp=4904750.00000 W
600 hp=5885700.00000 W
700 hp=6866650.00000 W
800 hp=7847600.00000 W
900 hp=8828550.00000 W
1000 hp=9809500.00000 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 = 9809.5000000 watt; 1 Watt = 0.0001019 horsepower.

20 horsepower = ___W

20 × 9809.5000000 = 196190.00000 W (we know 1 horsepower = 9809.5000000 watt)

Answer:

20 horsepower = 196190.00000 watt

Boiler Horsepower to Watts: Industrial Steam System Design

Boiler horsepower (BHP) is a specialized unit used exclusively for rating steam boilers. It has NO direct relationship to mechanical horsepower — one boiler horsepower equals 9,809.5 watts (approximately 33,475 BTU/hr), which is over 13 times larger than one mechanical horsepower. This unit dates from the era when boilers powered steam engines and represents the energy needed to evaporate 34.5 pounds of water per hour at 212°F.

  1. Identify the boiler rating in boiler horsepower (BHP).
  2. Multiply by 9,809.5 to get watts.
  3. For kilowatts, divide by 1,000: BHP × 9.8095 = kW.
  4. The result is the thermal energy output rate in watts.
💡 Tip: Do not confuse boiler HP with mechanical HP! A "200 BHP boiler" is not 200 × 745.7 W. It is 200 × 9,809.5 = 1,961,900 W (nearly 2 MW). Boiler HP is about 13.15× larger than mechanical HP.

Boiler HP to Watts: Industrial Boiler Sizes

Standard boiler ratings converted to watts and kilowatts:

HorsepowerWatt
10 BHP98,095 W
25 BHP245,238 W
50 BHP490,475 W
100 BHP980,950 W
200 BHP1,961,900 W
500 BHP4,904,750 W
800 BHP7,847,600 W
1,000 BHP9,809,500 W

Solved Examples: Boiler HP to Watts

Question 1: A hospital has a 150 BHP steam boiler. What is its thermal output in watts?

Solution:

Watts = BHP × 9,809.5

= 150 × 9,809.5

= 1,471,425 W

= 1,471.4 kW ≈ 1.47 MW

Answer: 150 BHP = 1,471,425 W (about 1.47 MW thermal output).

Question 2: A food processing plant needs a 300 BHP boiler. Express capacity in kW.

Solution:

kW = BHP × 9.8095

= 300 × 9.8095

= 2,942.9 kW

Answer: 300 BHP = 2,942.9 kW (nearly 3 MW) of steam-generating capacity.

Question 3: A university campus runs three 400 BHP boilers. Total capacity in watts?

Solution:

Single boiler: 400 × 9,809.5 = 3,923,800 W

Three boilers: 3 × 3,923,800 = 11,771,400 W

= 11,771.4 kW ≈ 11.77 MW

Answer: Total campus heating capacity = 11,771,400 W (11.77 MW).

Practice: Boiler HP to Watts

Try solving these on your own to test your understanding:

  1. Convert 20 BHP to watts. (Answer: 196,190 W)
  2. A brewery boiler is 75 BHP. Express in watts. (Answer: 735,713 W)
  3. Convert 250 BHP to kW. (Answer: 2,452.4 kW)
  4. A paper mill boiler is 600 BHP. What is that in watts? (Answer: 5,885,700 W)
  5. A small laundry boiler is 15 BHP. Convert to watts. (Answer: 147,143 W)

The Confusing History of Boiler Horsepower

In the 1800s, one boiler horsepower was defined as the steam needed to power one mechanical horsepower of engine output (accounting for inefficiency). Since early steam engines were only ~8% efficient, a boiler needed to produce ~13× more thermal energy than the engine's mechanical output — hence 1 BHP ≈ 13.15 mechanical HP. The definition was later standardized as evaporating 34.5 lb/hr of water at 212°F, which equals 9,809.5 W.

Modern Boiler Sizing: Moving Away from BHP

While BHP persists in North American boiler catalogs, modern practice increasingly uses direct thermal output in kW, MBH (thousands of BTU/hr), or pounds of steam per hour. A "100 BHP" boiler produces approximately 3,450 lb/hr of steam at 100 PSIG, or 980.95 kW thermal. International standards (EN, ISO) use kW exclusively. Knowing the BHP conversion remains important for maintaining older installed equipment.

Key Takeaways

  • 1 boiler HP = 9,809.5 watts (about 9.81 kW).
  • Boiler HP is NOT the same as mechanical HP (it is 13.15× larger).
  • Defined as evaporating 34.5 lb of water per hour at 212°F.
  • A 100 BHP boiler outputs about 981 kW (nearly 1 MW thermal).
  • Modern international standards use kW; BHP persists in North America.

Horsepower to Watt Conversion Formula

watt = horsepower × 9809.5000000

1 horsepower = 9809.5000000 watt

1 watt = 0.0001019 horsepower

Reverse: horsepower = watt × 0.0001019

Frequently Asked Questions

How many watt are in 1 horsepower?

There are 9809.5000000 watt in 1 horsepower. To convert horsepower to watt, multiply the value by 9809.5000000.

How do I convert horsepower to watt?

Multiply your horsepower value by 9809.5000000 to get the equivalent in watt. For example, 5 horsepower = 5 × 9809.5000000 = 49047.50000 watt.

How do I convert watt to horsepower?

Multiply your watt value by 0.0001019 to get the equivalent in horsepower. Alternatively, divide by 9809.5000000.

What is 10 horsepower in watt?

10 horsepower is equal to 98095.00000 watt.

What is 100 horsepower in watt?

100 horsepower is equal to 980950.00000 watt.