EngiRef / Energy conversion
Convert BTU (IT) to Kilojoules (BTU to kJ)
1 BTU = 1.05505585 kJ. Convert BTU (IT) to kilojoules with the exact factor, a common-values table and a free converter.
Conversion factor
kJ = BTU × 1.05505585
1 BTU = 1.05505585 kJ
Multiply by 1.05505585 kJ to go from BTU (IT) to kilojoules, or divide by it to come back. The factor and every value below are computed by the same converter that runs at /convert, so this page and the tool cannot disagree.
BTU to kJ table
| BTU (IT) (BTU) | Kilojoules (kJ) |
|---|---|
| 1 BTU | 1.05505585 kJ |
| 2 BTU | 2.11011171 kJ |
| 5 BTU | 5.27527926 kJ |
| 10 BTU | 10.5505585 kJ |
| 20 BTU | 21.1011171 kJ |
| 50 BTU | 52.7527926 kJ |
| 100 BTU | 105.505585 kJ |
Every figure is computed at build time by the site’s own converter from the energy unit registry. For a value that is not listed, put it into the interactive converter.
Frequently asked questions
How many kilojoules are in one BTU (IT)?
One BTU (IT) is 1.05505585 kJ, so 100 BTU is 105.505585 kJ.
What is the formula to convert BTU (IT) to kilojoules?
kJ = BTU × 1.05505585. Multiply the value in BTU (IT) by 1.05505585 to get kilojoules.
How do I convert kilojoules back to BTU (IT)?
BTU = kJ × 0.94781712, so 1 kJ is 0.94781712 BTU. The kJ to BTU page carries the same table in that direction.