Horsepower Calculator

Convert between mechanical horsepower, metric horsepower, kilowatts, and other power units.

Power Value

From Unit

To Unit

Converted Value

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Common Horsepower References

Compact car engine: ~120-200 hp

Lawn mower: ~3-7 hp

Window AC unit: ~1-2 hp (0.75-1.5 kW)

1 hp = approximately what one horse can sustain

How It Works

1 Mechanical HP = 745.7 W = 0.7457 kW. 1 Metric HP (PS) = 735.5 W. 1 kW = 3412 BTU/h. The calculator converts through watts as the base unit.

About this Calculator

The Horsepower Calculator is a free, easy-to-use tool for HP, kW, power. Simply enter your values and get instant, accurate results — no signup, no ads, no tracking. All calculations run locally in your browser, so your data stays completely private.

Privacy Note: All calculations are performed locally in your browser. No data is ever sent to a server or third party.