Converter hub
Power Converter
Power conversions connect electrical watts with mechanical horsepower. Mechanical and metric horsepower differ by about 1.4%, so check the standard before specifying an engine. Pick a pair below or open the page for the exact factor, a worked example and a full chart.
Units in this category
Power conversions connect electrical watts with mechanical horsepower. Mechanical and metric horsepower differ by about 1.4%, so check the standard before specifying an engine.
| Unit | Symbol | Definition |
|---|---|---|
| Watts | W | The watt is one joule per second, the SI unit of power. |
| Kilowatts | kW | A kilowatt is 1,000 watts and is common for appliances and EV charging. |
| Horsepower | hp | Mechanical horsepower is about 745.7 watts; metric horsepower is about 735.5 watts. |
| Metric HP | PS | Metric horsepower (PS) is exactly 735.49875 watts, used in European car specs. |
| BTU per Hour | BTU/h | One BTU per hour is about 0.293 watts, used for heating and cooling capacity. |
All power conversions
Every listed pair has its own page with the formula, examples and a chart. Choose the starting unit:
Watts (W)
Horsepower (hp)
Metric HP (PS)
BTU per Hour (BTU/h)
Frequently asked questions
How many power units are supported?
5 units, which gives 6 one-way conversions.
Are the factors exact?
They follow SI and international definitions. Where a unit is approximate by nature (for example Mach, months or fuel economy), the page says so.
Can I convert in both directions?
Yes. Every pair page has a swap link and the calculator accepts any decimal value.