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Watt To Horsepower Calculator

Work out watt to horsepower instantly with clear inputs, formula shown and shareable results.

About Watt To Horsepower Calculator

Converting Watts to Horsepower is one multiplication: a single W is 0.00134102 hp, so the amount is scaled by that factor. Reversing the direction divides by the same factor. The factor is an exact definition rather than a rounded figure, so the result stays precise at any magnitude. Mechanical horsepower is 550 ft·lbf/s = 745.6998716 W. Metric horsepower (PS), used in much of Europe, is 735.49875 W — about 1.4% smaller.

Formulas

Watts → Horsepower

hp = W × 0.00134102

Horsepower → Watts

W = hp ÷ 0.00134102

Worked example

With the default values below, Watt To Horsepower Calculator returns Converted Value of 1.34102209. Change any input above and every figure here is recalculated in your browser.

Inputs used

Amount to convert
1,000
Directionone of Watts → Horsepower, Horsepower → Watts
Watts → Horsepower

Results

Converted Value
1.34102209
Result Unit
hp
Multiplier Applied
0.00134102
Conversion Used
1 W = 0.00134102 hp

Step by step

  1. 1Values used
  2. 2Watts → Horsepower
  3. 3Horsepower → Watts
  4. 4Converted Value= 1.34102209
  5. 5Result Unit= hp
  6. 6Multiplier Applied= 0.00134102
  7. 7Conversion Used= 1 W = 0.00134102 hp

Assumptions and limits

  • The result is derived only from the 2 inputs listed above. Anything not among them is not part of the calculation.
  • In particular, this calculator does not take inflation, tax, fees or charges or compounding frequency into account.
  • Figures are rounded for display to 8 decimal places, so totals built from several rounded parts can differ slightly from the unrounded arithmetic.

How these calculators are built and tested is described on the Methodology page. If a figure looks wrong, please report it.

Frequently Asked Questions

How many hp are in one W?

One W equals 0.00134102 hp. That value is exact by definition.

How do I go from Horsepower back to Watts?

Divide by 0.00134102 rather than multiplying, or flip the direction selector which does it for you.

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