Watts to BTU Converter
Convert watts (W) to BTU per hour (BTU/h) instantly. Type a value — the result updates as you type, and the swap button converts the other way.
Watts to BTU/h formula
BTU/h = W × 3.41214163
1 watt = 3.41 BTU per hour · 1 BTU per hour = 0.2931 watts
To convert watts to BTU per hour, multiply the value by 3.41214163. For example, 1500 W:
BTU/h = 1500 × 3.41214163BTU/h = 5118.21245
So 1500 W = 5118.21 BTU/h.
Mental math shortcut
Quick mental estimate: multiply by 3.4. For 1500 W that gives about 5100 BTU/h — within 1% of the exact answer. Use the exact formula when precision matters.
Watts to BTU/h conversion table
BTU/h back to Watts
The same values converted the other way, rounded for everyday use:
| BTU per hour | Watts |
|---|---|
| 341.21 BTU/h | 100 W |
| 1706.07 BTU/h | 500 W |
| 2559.11 BTU/h | 750 W |
| 3412.14 BTU/h | 1000 W |
| 5118.21 BTU/h | 1500 W |
| 6824.28 BTU/h | 2000 W |
| 10236.42 BTU/h | 3000 W |
| 17060.71 BTU/h | 5000 W |
About the units
Watts (W)
BTU per hour (BTU/h)
BTU per hour measures heating or cooling power. 1 BTU/h ≈ 0.293 watts; air conditioners are rated in BTU/h.
Frequently asked questions
How many BTU per hour are in a watt?
One watt equals 3.41 BTU per hour.
What is 1500 Watts in BTU/h?
1500 W = 5118.21 BTU/h.
How do I convert BTU/h back to Watts?
Divide the BTU per hour by 3.41214163.