How to convert joules to BTU
To convert joules to BTU, multiply the value by the conversion factor 0.0009478171. To go the other way, multiply by 1,055.06 (or divide by 0.0009478171).
Worked example: 25 J to BTU
- Write the value: 25 J
- Multiply by 0.0009478171: 25 × 0.0009478171
- Result: 0.0236954 BTU
Joule to BTU conversion table
Quick reference values, rounded to 6 significant digits.
| Joule (J) | BTU (BTU) |
|---|---|
| 0.1 J | 0.0000947817 BTU |
| 0.25 J | 0.000236954 BTU |
| 0.5 J | 0.000473909 BTU |
| 1 J | 0.000947817 BTU |
| 2 J | 0.00189563 BTU |
| 3 J | 0.00284345 BTU |
| 4 J | 0.00379127 BTU |
| 5 J | 0.00473909 BTU |
| 6 J | 0.0056869 BTU |
| 7 J | 0.00663472 BTU |
| 8 J | 0.00758254 BTU |
| 9 J | 0.00853035 BTU |
| 10 J | 0.00947817 BTU |
| 12 J | 0.0113738 BTU |
| 15 J | 0.0142173 BTU |
| 20 J | 0.0189563 BTU |
| 25 J | 0.0236954 BTU |
| 30 J | 0.0284345 BTU |
| 40 J | 0.0379127 BTU |
| 50 J | 0.0473909 BTU |
| 75 J | 0.0710863 BTU |
| 100 J | 0.0947817 BTU |
| 250 J | 0.236954 BTU |
| 500 J | 0.473909 BTU |
| 1,000 J | 0.947817 BTU |
BTU to Joule
| BTU | J |
|---|---|
| 1 BTU | 1,055.06 J |
| 5 BTU | 5,275.28 J |
| 10 BTU | 10,550.56 J |
| 50 BTU | 52,752.79 J |
| 100 BTU | 105,506 J |
1 Joule in other energy units
About Joule and BTU
What is a joule (J)?
The joule is the SI unit of energy.
What is a btu (BTU)?
A British Thermal Unit is the energy to heat one pound of water by 1 °F.
Where joule to btu conversion is used
Energy conversions are needed for electricity bills, food calories, heating, batteries and physics. Converting between joules and BTU is especially common when you compare products, read foreign specifications, or fill in forms that expect a specific unit.
Need every unit at once? Use the full Energy Converter.
Frequently asked questions
How many BTU are in 1 joule?
1 Joule equals 0.000947817 BTU.
How do I convert joules to BTU?
Multiply the number of joules by 0.0009478171. For example, 25 J × 0.0009478171 = 0.0236954 BTU.
What is 25 J in BTU?
25 J = 0.0236954 BTU.
How many joules are in 1 btu?
1 BTU equals 1,055.06 J. Use the BTU to Joules converter for the reverse direction.
Is this Joule to BTU converter accurate?
Yes. It uses exact internationally defined conversion factors, calculated with full floating-point precision. Results are displayed rounded for readability.