Direct conversion
Convert British thermal unit [BTU] to joule [J] instantly with formula, examples, chart, and FAQs.
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Use the calculator below for any custom value, then check the formula, examples, chart, and reverse conversion links.
1 British thermal unit [BTU] = 1055.055853 joule [J]
1 British thermal unit [BTU] = 1055.055853 joule [J]
Example: 1 British thermal unit [BTU] equals 1055.055853 joule [J].
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 joule is the SI derived unit of energy, work, and heat.
HistoryThe joule is named after James Prescott Joule and became the standard SI energy unit.
Current useJoules are used in physics, engineering, nutrition science, batteries, heating, and mechanical work.
| British thermal unit [BTU] | joule [J] |
|---|---|
| 1 | 1055.055853 |
| 2 | 2110.111705 |
| 5 | 5275.279263 |
| 10 | 10550.558526 |
| 20 | 21101.117052 |
| 25 | 26376.396316 |
| 50 | 52752.792631 |
| 100 | 105505.585262 |
| 1000 | 1055055.85262 |
Use this formula: 1 British thermal unit [BTU] = 1055.055853 joule [J] Enter your value in the calculator and the result updates instantly.
1 British thermal unit [BTU] equals 1055.055853 joule [J].
Yes. Use the swap button in the calculator or open the related reverse conversion link when it is listed on this page.