All power units explained
| Unit | Symbol | Value in Watt | Description |
|---|---|---|---|
| Watt | W | 1 W | The watt is the SI unit of power, one joule per second. |
| Kilowatt | kW | 1,000 W | A kilowatt equals 1,000 watts, used for motors, generators and electricity load. |
| Horsepower | hp | 745.6998716 W | Mechanical horsepower is about 745.7 watts, used for engines and water pumps. |
| BTU per Hour | BTU/h | 0.2930710702 W | BTU per hour measures heating and cooling capacity of air conditioners. |
| Ton of Refrigeration | TR | 3,516.85 W | One ton of refrigeration (an "AC ton") equals 12,000 BTU/h, about 3.517 kW of cooling. |
Popular power conversions
Each conversion below has its own page with a formula, worked example and table.
When do you need a power converter?
Power conversions are used for choosing air conditioners, generators, IPS/UPS, motors and solar panels. Different countries and industries use different units, so a reliable converter prevents costly mistakes.
Frequently asked questions
Which power units are supported?
Watt (W), Kilowatt (kW), Horsepower (hp), BTU per Hour (BTU/h), Ton of Refrigeration (TR).
Is the converter free?
Yes, completely free with no limits, and it works offline once loaded.
How accurate are the results?
Conversions use exact standard factors with full double-precision arithmetic.