Watts to BTU per hour Converter
Type a value in watts to get it in btu per hour, and see the reverse conversion.
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Watts to BTU per hour Converter by TheCalcTools
How the Watts to BTU per hour Converter works
Air conditioner and heater capacities in the US are rated in BTU per hour. One watt is 3.41214 BTU/h; a 1,500 W space heater gives about 5,118 BTU/h.
To convert watts to btu per hour, multiply by 3.412141633. The calculator shows the result to 6 significant figures; the conversion factor itself is exact by definition.
Quick estimate in your head: multiply by 3.41.
The formula
Worked example
Using the default values shown in the calculator:
| Value in watts (W) | 1500 |
|---|
- 1,500 W × 3.412141633 = 5118.21 BTU/h.
Result:
| BTU per hour (BTU/h) | 5118.21 |
|---|---|
| 1 W in BTU/h | 3.41214 |
| Your number read as BTU/h, in W | 439.607 |
| Refrigeration tons (TR) | 0.426518 |
Conversion table
| W | BTU/h |
|---|---|
| 100 W | 341.214 BTU/h |
| 500 W | 1,706.07 BTU/h |
| 750 W | 2,559.11 BTU/h |
| 1,000 W | 3,412.14 BTU/h |
| 1,500 W | 5,118.21 BTU/h |
| 2,000 W | 6,824.28 BTU/h |
| 2,500 W | 8,530.35 BTU/h |
| 3,000 W | 10,236.4 BTU/h |
| 3,517 W | 12,000.5 BTU/h |
| 5,000 W | 17,060.7 BTU/h |
Frequently asked questions
What is 1 watt in btu per hour?
1 watt (W) equals 3.41214 BTU/h.
How many BTU is a 12,000 BTU air conditioner in kW?
12,000 ÷ 3,412.14 ≈ 3.52 kW of cooling (one refrigeration ton).
Sources and further reading
- Wikipedia: British thermal unit
- Wikipedia: Ton of refrigeration
- NIST: Guide for the Use of the International System of Units (SI)
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This calculator gives estimates for information only. Check important results independently before you rely on them. See our disclaimer.