Scope and source
Use this page to check unit relationships. Btu energy values use the International Table Btu shown in NIST Federal Standard 376B; refrigeration tons use the 12,000 BTU/h convention used by U.S. DOE materials.
1 Btu1.055056 kJ
1 BTU/h0.29307107 W
1 kW3,412.141633 BTU/h
1 RT12,000 BTU/h
Formula
W = BTU/h × 0.29307107
BTU/h = kW × 3,412.141633
RT = BTU/h ÷ 12,000
BTU/h = kW × 3,412.141633
RT = BTU/h ÷ 12,000
Units and symbols
| Term | Meaning | Use |
|---|---|---|
| Btu | Energy | Total heat quantity |
| BTU/h | Heat-transfer rate | HVAC capacity |
| RT | Refrigeration ton | Cooling capacity shorthand |
Lookup table
| BTU/h | kW | RT |
|---|---|---|
| 12,000 | 3.517 | 1 |
| 24,000 | 7.034 | 2 |
| 36,000 | 10.551 | 3 |
Related tool
Convert a specific capacity value.
BTU Calculator