Convert Watts (W) to Horsepower (international) (hp(I))

1 watt equals 0.00134102 horsepower (international).

Formula: hp(I) = W × 0.00134102

Watt to Horsepower (international) Converter

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How to Convert Watt to Horsepower (international)

1 watt = 0.00134102 horsepower (international)

Horsepower (international) = Watt × 0.00134102

Example: 1 W × 0.00134102 = 0.00134102 hp(I)

Reverse Conversion

To convert horsepower (international) back to watts:

  • Remember, 1 horsepower (international) equals 745.7 watts.
  • To convert 0.00134102 hp(I) to W, multiply 0.00134102 x 745.7, resulting in 1 W.

Common Watt to Horsepower (international) Conversions

Watt to Horsepower (international) (Part 1)
Watt to Horsepower (international) common conversions part 1
Watt Horsepower (international) Actions
1 watt 0.00134102 horsepower (international)
5 watts 0.00670511 horsepower (international)
10 watts 0.0134102 horsepower (international)
25 watts 0.0335256 horsepower (international)
Watt to Horsepower (international) (Part 2)
Watt to Horsepower (international) common conversions part 2
Watt Horsepower (international) Actions
50 watts 0.0670511 horsepower (international)
100 watts 0.134102 horsepower (international)
500 watts 0.670511 horsepower (international)
1000 watts 1.34102 horsepower (international)

Watts to horsepower (international) Conversion Table

Reference table with common watts to horsepower (international) conversions. All values calculated with high precision.

Watts to Horsepower (international) Table
0.1 to 500

Watts to horsepower (international) conversion table, values from 0.1 to 500
Watts Horsepower (international) Actions
0.1 W 0.000134102 hp(I)
14 W 0.000335256 hp(I)
12 W 0.000670511 hp(I)
1 W 0.00134102 hp(I)
2 12 W 0.00335256 hp(I)
5 W 0.00670511 hp(I)
10 W 0.0134102 hp(I)
25 W 0.0335256 hp(I)
50 W 0.0670511 hp(I)
100 W 0.134102 hp(I)
250 W 0.335256 hp(I)
500 W 0.670511 hp(I)

Watts to Horsepower (international) Table
1000 to 1 × 108

Watts to horsepower (international) conversion table, values from 1000 to 1 × 10⁸
Watts Horsepower (international) Actions
1000 W 1.34102 hp(I)
2500 W 3.35256 hp(I)
5000 W 6.70511 hp(I)
10000 W 13.4102 hp(I)
25000 W 33.5256 hp(I)
50000 W 67.0511 hp(I)
100000 W 134.102 hp(I)
250000 W 335.256 hp(I)
500000 W 670.511 hp(I)
1000000 W 1341.02 hp(I)
2500000 W 3352.56 hp(I)
5000000 W 6705.11 hp(I)
10000000 W 13410.2 hp(I)
2.5 × 107 W 33525.6 hp(I)
5 × 107 W 67051.1 hp(I)
1 × 108 W 134102 hp(I)

Horsepower (international) to Watts Table
0.0001 to 12

Horsepower (international) to watts conversion table, values from 0.0001 to 0.5
Horsepower (international) Watts Actions
0.0001 hp(I) 0.07457 W
0.00025 hp(I) 0.186425 W
0.0005 hp(I) 0.37285 W
0.001 hp(I) 0.7457 W
0.0025 hp(I) 1.86425 W
0.005 hp(I) 3.7285 W
0.01 hp(I) 7.457 W
0.025 hp(I) 18.6425 W
0.05 hp(I) 37.285 W
0.1 hp(I) 74.57 W
14 hp(I) 186.425 W
12 hp(I) 372.85 W

Horsepower (international) to Watts Table
1 to 100000

Horsepower (international) to watts conversion table, values from 1 to 100000
Horsepower (international) Watts Actions
1 hp(I) 745.7 W
2 12 hp(I) 1864.25 W
5 hp(I) 3728.5 W
10 hp(I) 7457 W
25 hp(I) 18642.5 W
50 hp(I) 37285 W
100 hp(I) 74570 W
250 hp(I) 186425 W
500 hp(I) 372850 W
1000 hp(I) 745700 W
2500 hp(I) 1864250 W
5000 hp(I) 3728500 W
10000 hp(I) 7457000 W
25000 hp(I) 1.86425 × 107 W
50000 hp(I) 3.7285 × 107 W
100000 hp(I) 7.457 × 107 W

Definition of Watt

Definition
SI base unit of power equal to one joule per second.
Exact relation
1 W = 1 J/s = 1 kg·m²·s⁻³
Sources
BIPM — SI Brochure

Definition of Horsepower (international)

Definition
International mechanical horsepower defined as exactly 550 ft·lbf/s.
Exact factor
1 hp (international) = 745.69987 W
Sources
NIST SP 1038

About the Watt

Facts & Uses

  • Named after James Watt, inventor of the improved steam engine.
  • Core SI unit for power — rate of energy transfer per second.
  • Used universally in physics, electronics, and engineering.

Curiosities

  • A human at rest emits about 100 W of heat.
  • Modern LED lamps use 5–15 W with similar brightness to 60–100 W incandescent bulbs.

About the Horsepower

Facts & Uses

  • Traditional power unit used in automotive engines, pumps, and motors.
  • Varies slightly by region (mechanical, metric, boiler, water, electric).
  • 1 hp ≈ 0.746 kW — equivalent to the work of lifting 550 pounds one foot per second.

Curiosities

  • Coined by James Watt to market early steam engines.
  • Still used for marketing despite SI replacement by kilowatts.

Frequently Asked Questions

How many horsepower (international) are in one watt?

One watt equals 0.00134102 horsepower (international). To convert, multiply the watt value by 0.00134102. For the reverse, divide the horsepower (international) value by 0.00134102 (or multiply by 745.7).

What is 1100 watts in horsepower (international)?

1100 watts = 1.4751 horsepower (international). This is one of the most commonly searched conversions for this pair.

How precise is the watt-to-horsepower (international) conversion?

The factor 0.00134102 is accurate to 6 significant figures, derived from international measurement standards. Our calculator uses full precision internally.

Looking for the reverse? Convert Horsepower (international) to Watt

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Conversion factors verified against NIST, BIPM, ISO 80000-4 Based on SI base units (W = J/s, BIPM). Last reviewed: April 2026
Adilson Fernandes By Adilson Fernandes
Tiago Fernandes Reviewed by Tiago Fernandes

All unit conversions on CoolConversion use conversion factors defined or documented by internationally recognised standards bodies (such as ISO and NIST), including both SI and non-SI units.