Convert between watts, kilowatts, horsepower, BTUs per hour and more in one step. Enter a value, pick your units, and see the result across every common power unit instantly.
| Watt (W) | |
| Kilowatt (kW) | |
| Megawatt (MW) | |
| Horsepower, mechanical (hp) | |
| Horsepower, metric (PS) | |
| BTU per hour (BTU/h) | |
| Foot-pound per second (ft·lb/s) | |
| Calorie per second (cal/s) |
How to Use
- Enter the power value you want to convert.
- Choose the unit you are converting from.
- Choose the unit you want to convert to, or press Swap to reverse the direction.
- Press Convert — the result appears above, with every other unit listed in the table.
Key Features
- Eight power units — watts, kilowatts, megawatts, mechanical and metric horsepower, BTU per hour, foot-pounds per second and calories per second.
- Live results — the conversion updates as you type, with a full comparison table.
- One-click swap — reverse the conversion direction instantly.
- 100% private — runs entirely in your browser; nothing is sent or stored.
FAQs
What is the difference between mechanical and metric horsepower?
Mechanical (imperial) horsepower equals 745.7 watts, while metric horsepower (PS, from the German Pferdestärke) equals 735.5 watts. They are close, but not identical — car makers usually quote metric PS.
How many watts are in a kilowatt?
Exactly 1000 watts. A kilowatt-hour is the energy used by a 1 kW appliance running for one hour.
What does BTU per hour measure?
The rate of heating or cooling. Air conditioners and heaters are often rated in BTU per hour; one BTU/h equals about 0.293 watts.
Is my data sent anywhere?
No. Everything runs entirely in your browser and never transmits or saves your entries.
Related Tools
Try these related tools: Energy Converter, Pressure Converter and Unit Converter.