Convert joules to BTU
1 J = 0.00094782 BTU. Change the amount below, or read the formula and the reference table further down.
1 joule equals
BTU
1 J = 0.00094782 BTU
The formula
Joules and BTU both measure energy from the same zero, so a single multiplier does the job.
BTU = J × 0.0009478171
Going the other way? Convert BTU to joules.
Joules to BTU table
Common values, rounded for reading.
| Joules (J) | BTU (BTU) |
|---|---|
| 1 | 0.000948 |
| 2 | 0.001896 |
| 3 | 0.002843 |
| 4 | 0.003791 |
| 5 | 0.004739 |
| 6 | 0.005687 |
| 7 | 0.006635 |
| 8 | 0.007583 |
| 9 | 0.00853 |
| 10 | 0.009478 |
| 15 | 0.014217 |
| 20 | 0.018956 |
| 25 | 0.023695 |
| 30 | 0.028435 |
| 40 | 0.037913 |
| 50 | 0.047391 |
| 75 | 0.071086 |
| 100 | 0.094782 |
| 250 | 0.236954 |
| 500 | 0.473909 |
| 1,000 | 0.947817 |
Questions people ask
- How many BTU are in a joule?
- One joule equals 0.0009478171 BTU.
- How do I convert joules to BTU by hand?
- Multiply the number of joules by 0.0009478171. For a rough check, 0.001 is close enough for most everyday use.
- What is 1 joule in BTU?
- 1 joule is 0.00094782 BTU.
Calcuit generates this page from a unit table, so the factors here match every other page on the site.