How to convert BTU to kilojoules
kJ = BTU × 1.055055853
Example: 5 BTU × 1.055055853 = 5.275279263 kJ
BTU to Kilojoules table
| BTU (BTU) | Kilojoules (kJ) |
|---|---|
| 0.5 BTU | 0.52752793 kJ |
| 1 BTU | 1.0550559 kJ |
| 2 BTU | 2.1101117 kJ |
| 3 BTU | 3.1651676 kJ |
| 4 BTU | 4.2202234 kJ |
| 5 BTU | 5.2752793 kJ |
| 6 BTU | 6.3303351 kJ |
| 7 BTU | 7.385391 kJ |
| 8 BTU | 8.4404468 kJ |
| 9 BTU | 9.4955027 kJ |
| 10 BTU | 10.550559 kJ |
| 15 BTU | 15.825838 kJ |
| 20 BTU | 21.101117 kJ |
| 25 BTU | 26.376396 kJ |
| 30 BTU | 31.651676 kJ |
| 40 BTU | 42.202234 kJ |
| 50 BTU | 52.752793 kJ |
| 75 BTU | 79.129189 kJ |
| 100 BTU | 105.50559 kJ |
| 250 BTU | 263.76396 kJ |
| 500 BTU | 527.52793 kJ |
| 1,000 BTU | 1,055.0559 kJ |
About these units
BTU (BTU): The British thermal unit (International Table) is about 1,055.06 joules, used for heating and air-conditioning.
Kilojoules (kJ): A kilojoule is 1,000 joules. Food labels in Europe and Australia show energy in kJ.
Frequently asked questions
How many kilojoules are in 1 BTU?
1 BTU equals 1.055055853 kilojoules (kJ).
How do I convert BTU to kJ?
Multiply the value in BTU by 1.055055853. For example, 5 BTU × 1.055055853 = 5.275279263 kJ.
How do I convert kilojoules back to BTU?
Multiply by 0.9478171203 (or divide by 1.055055853). 1 kJ = 0.9478171203 BTU.
What is a BTU?
The British thermal unit (International Table) is about 1,055.06 joules, used for heating and air-conditioning.
Conversion factors come from exact international definitions (NIST SP 811, BIPM) where they exist. Results show up to 10 significant digits. Need every energy unit at once? Use the Energy Converter.