Convert British Thermal Units to Kilojoules
BTU to kJ · energy conversion
What are british thermal units and kilojoules?
A British thermal unit is the energy to heat one pound of water by 1 °F, used for heating and AC. A kilojoule is 1,000 joules, used for food energy outside the US. For reference: a food Calorie is one kilocalorie (4,184 J), and home electricity is billed in kilowatt-hours.
How to convert british thermal units to kilojoules
1 BTU = 1.05506 kJ. To convert, multiply the number of british thermal units by 1.05506. For example, 5 BTU = 5.27528 kJ, and 20 BTU = 21.1011 kJ. To go the other way, multiply kilojoules by 0.947817 (since 1 kJ = 0.947817 BTU).
British Thermal Units to Kilojoules conversion table
| British Thermal Units (BTU) | Kilojoules (kJ) |
|---|---|
| 1 | 1.05506 |
| 10 | 10.5506 |
| 100 | 105.506 |
| 500 | 527.528 |
| 1,000 | 1,055.06 |
| 2,000 | 2,110.11 |
| 5,000 | 5,275.28 |
FAQ
What is 1 BTU in kJ?
1 BTU = 1.05506 kJ. To convert any amount, multiply the number of british thermal units by 1.05506.
How do I convert kilojoules back to british thermal units?
Go the other way: 1 kJ = 0.947817 BTU, so multiply kilojoules by 0.947817 to get british thermal units.
Is a british thermal unit bigger than a kilojoule?
Yes — 1 BTU is the larger unit, equal to 1.05506 kJ.
Are these energy conversions exact?
They use the standard internationally-defined conversion factors. Results are rounded to six significant figures for readability, which is accurate enough for everyday and most technical use.