Direct conversion
Convert British thermal unit [BTU] to kilojoule [kJ] instantly with formula, examples, chart, and FAQs.
Quick answer
Use the calculator below for any custom value, then check the formula, examples, chart, and reverse conversion links.
1 British thermal unit [BTU] = 1.055056 kilojoule [kJ]
1 British thermal unit [BTU] = 1.055056 kilojoule [kJ]
Example: 1 British thermal unit [BTU] equals 1.055056 kilojoule [kJ].
Energy conversions use joule as the reference unit, including electrical, thermal, nutrition, and mechanical energy units.
Displayed results are rounded for readability. The calculator keeps enough precision for everyday use and switches to scientific notation for very large or very small values. Last reviewed: 2026-05-21.
The British thermal unit (BTU) is a energy unit used to express measurements in this converter.
HistoryThis unit is included because it appears in practical measurement systems, technical references, product specifications, or everyday conversion needs.
Current useUse British thermal unit when comparing energy values, checking specifications, converting between systems, or preparing quick estimates.
The kilojoule is an energy unit equal to 1000 joules.
HistoryKilojoules are a metric multiple of joules and became common where joules are too small.
Current useKilojoules are used for food energy labels, thermodynamics, exercise energy, and engineering calculations.
| British thermal unit [BTU] | kilojoule [kJ] |
|---|---|
| 1 | 1.055056 |
| 2 | 2.110112 |
| 5 | 5.275279 |
| 10 | 10.550559 |
| 20 | 21.101117 |
| 25 | 26.376396 |
| 50 | 52.752793 |
| 100 | 105.505585 |
| 1000 | 1055.055853 |
Use this formula: 1 British thermal unit [BTU] = 1.055056 kilojoule [kJ] Enter your value in the calculator and the result updates instantly.
1 British thermal unit [BTU] equals 1.055056 kilojoule [kJ].
Yes. Use the swap button in the calculator or open the related reverse conversion link when it is listed on this page.