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Joules to BTU (J to BTU)
Convert joules to BTU: 1 J = 0.000947817 BTU. Exact conversion factor, formula, 22-row table and worked examples, with JSON API and MCP access.
Formula
1 J = 0.000947817 BTU
BTU = joules × 0.0009478171203 — reverse: joules = BTU × 1055.055853
The factor is derived from the SI definitions of both units (base unit: J) as listed in NIST SP 811; results on this page are shown to 6 significant figures, the API returns up to 12.
Worked examples
- 5 J = 0.00473909 BTU
- 12.5 J = 0.0118477 BTU
- 100 J = 0.0947817 BTU
Joules to BTU conversion table
| Joules (J) | BTU (BTU) |
|---|---|
| 1 | 0.000947817 |
| 2 | 0.00189563 |
| 3 | 0.00284345 |
| 4 | 0.00379127 |
| 5 | 0.00473909 |
| 6 | 0.0056869 |
| 7 | 0.00663472 |
| 8 | 0.00758254 |
| 9 | 0.00853035 |
| 10 | 0.00947817 |
| 15 | 0.0142173 |
| 20 | 0.0189563 |
| 25 | 0.0236954 |
| 30 | 0.0284345 |
| 40 | 0.0379127 |
| 50 | 0.0473909 |
| 75 | 0.0710863 |
| 100 | 0.0947817 |
| 200 | 0.189563 |
| 250 | 0.236954 |
| 500 | 0.473909 |
| 1000 | 0.947817 |
FAQ
How many BTU are in one joule?
1 J = 0.000947817 BTU. The factor comes from the SI definitions of both units (NIST SP 811 / BIPM), so it is exact or correct to at least 10 significant figures.
What is the formula to convert joules to BTU?
Multiply the value in joules by 0.0009478171203: BTU = joules × 0.0009478171203. For example, 5 J = 0.00473909 BTU.
How do I convert BTU back to joules?
Multiply by the inverse factor 1055.055853 (joules = BTU × 1055.055853), or use the BTU-to-joules page.
Related conversions
- BTU to joules (reverse)
- Energy Converter — all energy units in one tool
- Kilocalories (food calories) to Kilojoules
- Kilojoules to Kilocalories (food calories)
- Joules to Calories (small, thermochemical)
- Calories (small, thermochemical) to Joules
- Kilowatt-hours to Megajoules
- Megajoules to Kilowatt-hours
- Kilowatt-hours to BTU
- BTU to Kilowatt-hours
Machine access
- API:
GET https://tttkmbb.com/api/v1/convert?value=5&from_unit=J&to_unit=BTU - MCP: server
https://tttkmbb.com/mcp, toolconvert_unitswith{"value":5,"from_unit":"J","to_unit":"BTU"} - Markdown: https://tttkmbb.com/conversion/joules-to-btu.md · JSON: https://tttkmbb.com/conversion/joules-to-btu.json (add
?value=for a result) · Units: /api/v1/units?quantity=energy - OpenAPI operationId:
convert_units. Freshness:static. Authentication: none.