🔌 Power Converter
Convert between watts, kilowatts, horsepower and BTU/h. Car engines, appliances and HVAC systems are rated in different power units, 1 hp = 745.7 W.
1 W = 0.001 kW
1 watts = 0.001 kilowatts
1 × 0.001 = 0.001
1 W equals 0.001 kW, so multiplying by 0.001 converts the value. The result describes the exact same quantity, only the measuring stick changes.
Popular power conversions
All power units
| Unit | Symbol | Definition |
|---|---|---|
| Watt | W | The watt (W) is the SI unit of power, one joule per second. Light bulbs, chargers and speakers are rated in watts. |
| Kilowatt | kW | A kilowatt (kW) is 1,000 watts. Electric vehicle motors, home appliances and solar systems are rated in kilowatts; 1 kW ≈ 1.34 hp. |
| Megawatt | MW | A megawatt (MW) is one million watts. Power plants and wind turbines are rated in megawatts; 1 MW supplies roughly 750-1,000 homes. |
| Horsepower (mechanical) | hp | Mechanical horsepower (hp) is exactly 745.6998715823 watts, 550 foot-pounds per second, defined by James Watt. US and UK car engines are rated in this horsepower. |
| Metric horsepower | PS | Metric horsepower (PS, from German "Pferdestärke") is exactly 735.49875 watts, about 1.4% smaller than mechanical hp. European and Japanese car specs commonly use PS. |
| BTU per hour | BTU/h | BTU per hour (BTU/h) is the US rating unit for heating and cooling equipment, about 0.293 watts. A 12,000 BTU/h air conditioner equals 3.52 kW of cooling. |
Frequently asked questions
How do I convert power units?
Choose your two units in the converter above and type a value, the result updates instantly, entirely in your browser. All 6 power units on this page are interchangeable, so you can convert in either direction.
Which power units can I convert here?
This converter supports 6 power units: Watt (W), Kilowatt (kW), Megawatt (MW), Horsepower (mechanical) (hp) and 2 more. Pick any two to convert between them.
What is the most common power conversion?
One of the most-used power conversions is Horsepower to Kilowatts (hp → kW). Every power pair we support is linked below, each with its own formula and table.
Is this Power Converter free and private?
Yes. It is free with no sign-up, uses the exact internationally defined conversion factors, and computes every result locally in your browser, nothing you type is uploaded, and the page keeps working offline.