How many watts are in one mechanical horsepower?

One mechanical horsepower equals 745.699872 W. The formula is W = hp × 745.699872.

How do I convert mechanical horsepower to watts?

Multiply the value in mechanical horsepower by 745.699872. For example, 100 × 745.699872 = 74,569.987158 — so 100 hp = 74,569.987158 W.

Pair · linear · factor 745.699872

mechanical horsepower to watts

hpW

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mechanical horsepower · ≈ 74,569.99 W (base)

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hpmechanical horsepower100

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A glowing emerald silhouette of a horse dissolving into the outline of a piston and a gear, wrapped in a geometric grid, against a cosmic nebula in violet and magenta

Power

Horsepower vs kilowatts — why we still measure engines in horses

We live in the age of electric cars and processors, yet we still rate engine power in a unit based on a working horse from an 18th-century mine. Horsepower is one of the most durable marketing coups in the history of engineering — invented to sell steam engines. Here is where it came from, why 1 hp is not the power of one horse, and why the authorities insist on kilowatts.

12 min