Power converter
BTU per Hour to Watts
Converting BTU per Hour to Watts is a single multiplication when you know the factor. One BTU/h equals 0.29307107 W, so multiply the value in BTU/h by 0.29307107. The calculator below works in both directions and accepts decimals.
Formula 1 BTU/h = 0.29307107 W
Need the other direction? Watts to BTU per Hour.
How to convert BTU per Hour to Watts
One BTU per hour is about 0.293 watts, used for heating and cooling capacity. The watt is one joule per second, the SI unit of power.
To convert BTU per Hour to Watts, multiply the value in BTU/h by 0.29307107. For example, 10 BTU/h × 0.29307107 = 2.930711 W. This works because the ratio between the two units is constant for every value in power.
Worked examples
| BTU/h | W |
|---|---|
| 1 BTU/h | 0.29307107 W |
| 2.5 BTU/h | 0.73267768 W |
| 5 BTU/h | 1.465355 W |
| 10 BTU/h | 2.930711 W |
| 25 BTU/h | 7.326777 W |
| 50 BTU/h | 14.653554 W |
| 100 BTU/h | 29.307107 W |
Reverse conversion
| W | BTU/h |
|---|---|
| 1 W | 3.412142 BTU/h |
| 5 W | 17.060708 BTU/h |
| 10 W | 34.121416 BTU/h |
| 25 W | 85.303541 BTU/h |
| 50 W | 170.607082 BTU/h |
| 100 W | 341.214163 BTU/h |
When this conversion is useful
This is the calculation you need when you are comparing an engine, a generator or an appliance across standards. Because the factor is fixed, you can use the same number for a single measurement or for a batch: 1,000 BTU/h is 293.07107 W.
Is the conversion exact?
Yes for practical use: the factors come from international definitions, with rounding applied only for display.
Reference: BIPM SI Brochure and NIST SP 811. Last reviewed: 2026-11-01.
BTU/h to W conversion chart
The chart lists the most requested values. For a value that is not here, use the converter at the top of the page.
| BTU per Hour (BTU/h) | Watts (W) |
|---|---|
| 1 BTU/h | 0.29307107 W |
| 2 BTU/h | 0.58614214 W |
| 3 BTU/h | 0.87921321 W |
| 4 BTU/h | 1.172284 W |
| 5 BTU/h | 1.465355 W |
| 6 BTU/h | 1.758426 W |
| 7 BTU/h | 2.051497 W |
| 8 BTU/h | 2.344569 W |
| 9 BTU/h | 2.63764 W |
| 10 BTU/h | 2.930711 W |
| 11 BTU/h | 3.223782 W |
| 12 BTU/h | 3.516853 W |
| 13 BTU/h | 3.809924 W |
| 14 BTU/h | 4.102995 W |
| 15 BTU/h | 4.396066 W |
| 16 BTU/h | 4.689137 W |
| 17 BTU/h | 4.982208 W |
| 18 BTU/h | 5.275279 W |
| 19 BTU/h | 5.56835 W |
| 20 BTU/h | 5.861421 W |
| 21 BTU/h | 6.154492 W |
| 22 BTU/h | 6.447564 W |
| 23 BTU/h | 6.740635 W |
| 24 BTU/h | 7.033706 W |
| 25 BTU/h | 7.326777 W |
| 26 BTU/h | 7.619848 W |
| 27 BTU/h | 7.912919 W |
| 28 BTU/h | 8.20599 W |
| 29 BTU/h | 8.499061 W |
| 30 BTU/h | 8.792132 W |
| 31 BTU/h | 9.085203 W |
| 32 BTU/h | 9.378274 W |
| 33 BTU/h | 9.671345 W |
| 34 BTU/h | 9.964416 W |
| 35 BTU/h | 10.257487 W |
| 36 BTU/h | 10.550559 W |
| 37 BTU/h | 10.84363 W |
| 38 BTU/h | 11.136701 W |
| 39 BTU/h | 11.429772 W |
| 40 BTU/h | 11.722843 W |
| 41 BTU/h | 12.015914 W |
| 42 BTU/h | 12.308985 W |
| 43 BTU/h | 12.602056 W |
| 44 BTU/h | 12.895127 W |
| 45 BTU/h | 13.188198 W |
| 46 BTU/h | 13.481269 W |
| 47 BTU/h | 13.77434 W |
| 48 BTU/h | 14.067411 W |
| 49 BTU/h | 14.360482 W |
| 50 BTU/h | 14.653554 W |
| 60 BTU/h | 17.584264 W |
| 70 BTU/h | 20.514975 W |
| 80 BTU/h | 23.445686 W |
| 90 BTU/h | 26.376396 W |
| 100 BTU/h | 29.307107 W |
Frequently asked questions
How many Watts are in 1 BTU per Hour?
1 BTU/h equals 0.29307107 W.
How do I convert BTU per Hour to Watts?
Multiply the BTU/h value by 0.29307107. Example: 25 BTU/h = 7.326777 W.
What is 2.5 BTU/h in W?
2.5 BTU/h = 0.73267768 W.
Is the BTU/h to W conversion exact?
Yes for practical use: the factors come from international definitions, with rounding applied only for display.
Does the calculator work offline?
Yes. The conversion runs in your browser with JavaScript, so it works after the page has loaded, even without a connection.