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Conversion result
These are thermal capacity units. Equipment input power depends on its efficiency and rating plate.
BTU/h to kW formula
For HVAC capacity, use kW = BTU/h ÷ 3,412.142. The reverse is BTU/h = kW × 3,412.142. One refrigeration ton is 12,000 BTU/h = 3.517 kW.
| BTU/h | kW | Watts | Tons |
|---|---|---|---|
| 6,000 | 1.759 | 1,759 | 0.500 |
| 9,000 | 2.638 | 2,638 | 0.750 |
| 12,000 | 3.517 | 3,517 | 1.000 |
| 18,000 | 5.276 | 5,276 | 1.500 |
| 24,000 | 7.034 | 7,034 | 2.000 |
| 36,000 | 10.551 | 10,551 | 3.000 |
| 60,000 | 17.585 | 17,585 | 5.000 |
Values are rounded from 1 kW = 3,412.142 BTU/h and 1 ton of cooling = 12,000 BTU/h. Use the equipment manufacturer's published rating for final selection.
FAQ
Does 12,000 BTU mean 12,000 watts?
No. In HVAC, “12,000 BTU” usually means 12,000 BTU/h of cooling capacity, which is about 3.517 kW of thermal capacity. The electrical input is a separate rating.
How do I convert watts to BTU/h?
Multiply watts by 3.412142. For example, 1,000 W of thermal capacity is about 3,412 BTU/h.
Can I use this to size an AC?
Use the conversion to compare published capacities. Use a load calculation to choose equipment size; try the BTU calculator or AC size calculator for a preliminary estimate.