How to convert watts to BTU per hour
BTU/h = W × 3.412141633Multiply the value in watts by 3.412141633. To go the other way, multiply by 0.2930710702 (or divide by 3.412141633).
A watt is larger than a BTU per hour: one watt contains 3.412141633 BTU per hour.
Worked examples
- 1 watt1 W × 3.412141633 = 3.412141633 BTU/h
- 5 watts5 W × 3.412141633 = 17.06070817 BTU/h
- 10 watts10 W × 3.412141633 = 34.12141633 BTU/h
- 20 watts20 W × 3.412141633 = 68.24283266 BTU/h
- 100 watts100 W × 3.412141633 = 341.2141633 BTU/h
Watts to BTU per hour conversion table
Values are calculated by the conversion engine and rounded to 8 significant figures.
| Watts (W) | BTU per hour (BTU/h) |
|---|---|
| 0.1 W | 0.34121416 BTU/h |
| 0.25 W | 0.85303541 BTU/h |
| 0.5 W | 1.7060708 BTU/h |
| 1 W | 3.4121416 BTU/h |
| 2 W | 6.8242833 BTU/h |
| 3 W | 10.236425 BTU/h |
| 4 W | 13.648567 BTU/h |
| 5 W | 17.060708 BTU/h |
| 6 W | 20.47285 BTU/h |
| 7 W | 23.884991 BTU/h |
| 8 W | 27.297133 BTU/h |
| 9 W | 30.709275 BTU/h |
| 10 W | 34.121416 BTU/h |
| Watts (W) | BTU per hour (BTU/h) |
|---|---|
| 12 W | 40.9457 BTU/h |
| 15 W | 51.182124 BTU/h |
| 20 W | 68.242833 BTU/h |
| 25 W | 85.303541 BTU/h |
| 30 W | 102.36425 BTU/h |
| 40 W | 136.48567 BTU/h |
| 50 W | 170.60708 BTU/h |
| 75 W | 255.91062 BTU/h |
| 100 W | 341.21416 BTU/h |
| 250 W | 853.03541 BTU/h |
| 500 W | 1,706.0708 BTU/h |
| 1,000 W | 3,412.1416 BTU/h |
About the units
Watt (W)
The SI unit of power: one joule per second. An LED bulb draws around 10 W, a microwave about 1,000 W.
BTU per hour (BTU/h)
About 0.293 W. Air conditioners and furnaces are rated in BTU/h — a 12,000 BTU/h unit is one ton of cooling. One BTU per hour equals 0.2930710702 watts (W).
Frequently asked questions
How many BTU per hour are in one watt?
There are 3.412141633 BTU per hour in one watt, and this value is exact by definition.
How do I convert watts to BTU per hour?
Multiply the number of watts by 3.412141633. For example, 10 W × 3.412141633 = 34.12141633 BTU/h.
How many watts are in one BTU per hour?
One BTU per hour equals 0.2930710702 watts. That is the reverse factor, 1 ÷ 3.412141633.
What is 10 watts in BTU per hour?
10 W = 34.12141633 BTU/h.
Is this W to BTU/h converter accurate?
Yes. Both units are defined exactly in terms of SI units, so the conversion factor is exact; results are shown to 12 significant figures by default and you can change precision in the converter. Calculations run in your browser using the same tested engine that generated this page.