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Convert joule [J] to British thermal unit [BTU] instantly with formula, examples, chart, and FAQs.
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1 joule [J] = 0.000948 British thermal unit [BTU]
1 joule [J] = 0.000948 British thermal unit [BTU]
Example: 1 joule [J] equals 0.000948 British thermal unit [BTU].
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 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.
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.
| joule [J] | British thermal unit [BTU] |
|---|---|
| 1 | 0.000948 |
| 2 | 0.001896 |
| 5 | 0.004739 |
| 10 | 0.009478 |
| 20 | 0.018956 |
| 25 | 0.023695 |
| 50 | 0.047391 |
| 100 | 0.094782 |
| 1000 | 0.947817 |
Use this formula: 1 joule [J] = 0.000948 British thermal unit [BTU] Enter your value in the calculator and the result updates instantly.
1 joule [J] equals 0.000948 British thermal unit [BTU].
Yes. Use the swap button in the calculator or open the related reverse conversion link when it is listed on this page.