Home › Engineering › Joules to BTU
Convert joules to btu instantly. Enter a value below, or use the formula and reference table further down the page.
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How to convert joules to btu
Multiply the value by 0.0009478171.
BTU = J × 0.0009478171Example: 10 J = 0.0095 BTU.
Joules to BTU conversion table
| Joules (J) | BTU (BTU) |
|---|---|
| 1 J | 0.0009 BTU |
| 2 J | 0.0019 BTU |
| 3 J | 0.0028 BTU |
| 4 J | 0.0038 BTU |
| 5 J | 0.0047 BTU |
| 10 J | 0.0095 BTU |
| 15 J | 0.0142 BTU |
| 20 J | 0.019 BTU |
| 25 J | 0.0237 BTU |
| 50 J | 0.0474 BTU |
| 100 J | 0.0948 BTU |
Frequently asked questions
How many btu is 1 joule?
1 joule equals 0.0009 btu.
What is the formula to convert J to BTU?
To convert J to BTU, multiply the value by 0.0009478171. The full formula is: BTU = J × 0.0009478171.
How do I convert btu back to joules?
Use the same calculator above and type your value into the btu field instead — it converts in both directions. Or use the reverse formula: J = BTU ÷ 0.0009478171.
Is the J to BTU conversion exact?
The conversion factor used here (0.0009478171) is the standard internationally defined value. Results on this page are rounded to four decimal places for readability.