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Convert Calc

Horsepower to Watts Converter

Enter a value to instantly convert between power units.

Precision4 dp

1 Horsepower (mech) = 745.6999 Watt

Key Formulas

Kilowatt → Horsepower (mech)

hp = kW × 1.34102

Horsepower (mech) → Kilowatt

kW = hp × 0.7457

Watt → Kilowatt

kW = W × 0.001

Kilowatt → Watt

W = kW × 1000

Formula

W = hp × 745.7

One mechanical horsepower equals 745.7 watts. This unit was defined by James Watt to rate steam engines — the power of one horse doing work. Now used for engines, motors, and mechanical equipment.

Source: NIST SP 811

Frequently Asked Questions

Real-World Examples

1 hp equals 745.7 watts — one horse's power.

1 hp = 745.7 W

10 hp equals 7457 W — small car engine.

10 hp = 7457 W

100 hp equals 74,570 W — large vehicle.

100 hp = 74570 W

0.5 hp equals 372.85 W.

0.5 hp = 372.85 W