Power is measured in units such as W, kW, MW, PS, hp. Pick a source and target unit above, enter a value, and the result appears instantly — free and entirely in your browser. Below you'll find the most common individual conversions as dedicated pages.
Which power units are there?
- Watt (W) — The watt (W) is the SI unit of power: one joule per second. It measures the rate of energy use — a phone charger draws a few watts, an electric kettle around 2,000 W.
- Kilowatt (kW) — The kilowatt (kW) equals 1,000 watts. It is the legal unit for engine power in the EU and rates appliances, motors and electric-car charging speeds.
- Megawatt (MW) — The megawatt (MW) equals one million watts. It is used to rate power plants, wind turbines and large industrial loads.
- Metric horsepower (PS) — Metric horsepower (PS, from German 'Pferdestärke') is defined as exactly 735.49875 watts. It is the traditional engine-power figure in Germany and much of Europe.
- Mechanical horsepower (hp) — Mechanical horsepower (hp) equals about 745.7 watts. It is the imperial engine-power unit used in the US and UK — slightly larger than the metric PS.
Key facts about power
Car engines are rated in kilowatts by EU law, but everyday talk uses horsepower — PS in Europe, hp in the US and UK. Converting between kW, PS and hp is a constant need when comparing cars.
One metric horsepower (PS) is defined as exactly 735.49875 W, so 1 kW = 1.3596 PS. Mechanical horsepower (hp) is 745.7 W, giving 1 kW = 1.341 hp — the two horsepowers differ by about 1.4%.
How to use the power converter
- Pick the source unit and enter the power value.
- Pick the target unit — the result appears instantly.
- Use the swap button to reverse the direction.
Everything runs locally in your browser — no uploads, no waiting, no limits, and it even works offline.