Watts to Btus Per Hour
The watt is the SI unit of power, equal to one joule per second, used to rate everything from light bulbs to engines. BTU per hour measures heating and cooling power, the standard rating unit for air conditioners and furnaces in the US. 1 W equals ≈3.41214 BTU/h, so converting between them is a matter of multiplying by that fixed factor — type any value into the converter below and both sides update instantly as you type.
Both units belong to power, measured here against power's base unit (W) — every other power unit on this site converts through that same reference point, which is why the table below can also be read as a quick cross-check against nearby values.
Formula
BTU/h = W × ≈3.41214
W = BTU/h × ≈0.293071
Worked example: 5 W × ≈3.41214 = ≈17.0607 BTU/h.
Conversion table
| Watt (W) | BTU per hour (BTU/h) |
|---|---|
| 1 W | ≈3.41214 BTU/h |
| 2 W | ≈6.82428 BTU/h |
| 3 W | ≈10.2364 BTU/h |
| 5 W | ≈17.0607 BTU/h |
| 10 W | ≈34.1214 BTU/h |
| 20 W | ≈68.2428 BTU/h |
| 25 W | ≈85.3035 BTU/h |
| 50 W | ≈170.607 BTU/h |
| 100 W | ≈341.214 BTU/h |
| 250 W | ≈853.035 BTU/h |
| 500 W | ≈1,706.07 BTU/h |
| 1,000 W | ≈3,412.14 BTU/h |
Frequently asked
- How many BTUs per hour in a watt?
- 1 W equals ≈3.41214 BTU/h.
- How do I convert Watts to BTUs per hour?
- Multiply the value in W by ≈3.41214 to get BTU/h. The converter above does this instantly as you type.
- Is the conversion exact?
- Yes — Watt and BTU per hour are both defined by a fixed conversion factor to power's base unit (W), so the result shown is exact to the precision displayed, not an approximation.