How joules and BTU are converted
1,055.05585262 J = 1 BTU. In reverse, 2 BTU = 2,110.11170524 J.
BTU = joules ÷ 1,055.05585262; joules = BTU × 1,055.05585262
- Divide joules by 1,055.05585262 to find BTU.
- Reverse the calculation to convert BTU back to joules.
- Only the displayed values are rounded. The conversion uses the full unit factor.
Worked example — 1,055.05585262 J = 1 BTU. In reverse, 2 BTU = 2,110.11170524 J.
Common joules to BTU values
| Joules | BTU (international table) |
|---|---|
| 1 J | 0.0009478171203 BTU |
| 10 J | 0.009478171203 BTU |
| 100 J | 0.09478171203 BTU |
| 1,000 J | 0.9478171203 BTU |
| 5,000 J | 4.739085602 BTU |
| 10,000 J | 9.478171203 BTU |
Swipe the table sideways to see the rest.
Results use the same exact factors as the calculator.
Things to consider
- Check whether equipment lists BTU or BTU/h. They measure different quantities.
- International-table and thermochemical BTU use slightly different conversion factors.
- Power in kilowatts needs a duration in hours to calculate energy in kWh.
- Negative amounts can represent an energy change, such as heat leaving a system.
Frequently asked questions
How do I convert joules to BTU?
Divide by 1,055.05585262. 1,055.05585262 J = 1 BTU. In reverse, 2 BTU = 2,110.11170524 J.
Can I convert BTU back to joules?
Yes. Choose the reverse direction. Multiply by 1,055.05585262.
Which BTU definition does this use?
International-table BTU, equal to 1,055.05585262 joules. Thermochemical BTU is about 1,054.35026444 joules and is not used here.
Can I convert BTU/h directly to joules?
No. BTU/h measures power, so a duration is required. Multiply BTU/h by hours to get BTU, then convert that energy to joules.
Results are estimates for general information only, not financial, medical or professional advice.