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Watts to Horsepower (mechanical) (W to hp)

Convert watts to horsepower (mechanical): 1 W = 0.00134102 hp. Exact conversion factor, formula, 22-row table and worked examples, with JSON API and MCP access.

Formula

1 W = 0.00134102 hp

horsepower (mechanical) = watts × 0.00134102209 — reverse: watts = horsepower (mechanical) × 745.6998716

The factor is derived from the SI definitions of both units (base unit: W) as listed in NIST SP 811; results on this page are shown to 6 significant figures, the API returns up to 12.

Worked examples

Watts to horsepower (mechanical) conversion table

Watts (W)Horsepower (mechanical) (hp)
10.00134102
20.00268204
30.00402307
40.00536409
50.00670511
60.00804613
70.00938715
80.0107282
90.0120692
100.0134102
150.0201153
200.0268204
250.0335256
300.0402307
400.0536409
500.0670511
750.100577
1000.134102
2000.268204
2500.335256
5000.670511
10001.34102

FAQ

How many horsepower (mechanical) are in one watt?

1 W = 0.00134102 hp. The factor comes from the SI definitions of both units (NIST SP 811 / BIPM), so it is exact or correct to at least 10 significant figures.

What is the formula to convert watts to horsepower (mechanical)?

Multiply the value in watts by 0.00134102209: horsepower (mechanical) = watts × 0.00134102209. For example, 5 W = 0.00670511 hp.

How do I convert horsepower (mechanical) back to watts?

Multiply by the inverse factor 745.6998716 (watts = horsepower (mechanical) × 745.6998716), or use the horsepower (mechanical)-to-watts page.

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