How to Convert BTU per hour to Watts (BTU/h to W)
Power conversions help compare car engines in hp and kW, and air-con units rated in BTU/h against their electrical draw in watts. This guide shows how to convert btu per hour into watts by hand, with examples and a quick-reference table.
The conversion
To convert btu per hour to watts, multiply the value by 0.29307107. To go the other way, divide by the same number (or multiply by 3.4121416351). For a quick estimate, multiply by about 0.29.
Watts = btu per hour × 0.29307107
Worked examples
- 3 BTU/h = 0.879213 W
- 12.5 BTU/h = 3.6634 W
- 75 BTU/h = 21.9803 W
BTU per hour to Watts table
| BTU per hour | Watts |
|---|---|
| 1 BTU/h | 0.293071 W |
| 2 BTU/h | 0.586142 W |
| 5 BTU/h | 1.4654 W |
| 10 BTU/h | 2.9307 W |
| 20 BTU/h | 5.8614 W |
| 25 BTU/h | 7.3268 W |
| 50 BTU/h | 14.6536 W |
| 100 BTU/h | 29.3071 W |
| 250 BTU/h | 73.2678 W |
| 500 BTU/h | 146.5355 W |
| 1,000 BTU/h | 293.0711 W |
Common questions
Is BTU/h to W exact?
The factors used here are the internationally defined values where they exist; results are rounded for display only.
How do I convert back?
Use the Watts to BTU per hour converter.
Mistakes to avoid
Rounding the factor too early
Using 3 instead of 3.28 for feet per metre introduces an error of almost 9% before you have started.
Dropping the units
A bare number without a unit is easy to misread later. Always write the unit with the result.
Mixing similar-sounding units
US and imperial gallons, pints and tons are different sizes, and decimal kilobytes differ from binary kibibytes.
Background
A conversion table is handy for common values, but a calculator is faster and avoids interpolation errors for anything in between.
Unit conversion is simply multiplication by a fixed ratio. The ratio between two units of the same quantity never changes, so once you know it you can convert any value in either direction.
Singapore adopted the metric system in the 1970s, replacing imperial units and traditional Chinese measures in most official uses. Metric units are now standard in schools, trade and government, but older units survive in property, markets and imported goods.
For any value, use the BTU per hour to Watts Converter or browse all power converters.
Run your own numbers: BTU per hour to Watts Converter