Convert joules to BTU
Joules to British thermal units. Enter a value to convert, or use the joules to BTU chart further down the page.
1 joule equals 0.0009478171203 British thermal units. Going the other way, 1 British thermal unit = 1,055.055853 joules.
How to convert joules to BTU
To convert joules to British thermal units, multiply the joule value by 0.0009478171203. You can also divide by 1055.055853 to get the same answer.
BTU = J × 0.0009478171203
Worked example
Convert 15 J to British thermal units:
15 J = 0.0142172568 BTU
joules to BTU conversion chart
Use this joules to BTU table for quick reference without typing anything.
| joules (J) | British thermal units (BTU) |
|---|---|
| 0.01 J | 0.000009478171203 BTU |
| 0.1 J | 0.00009478171203 BTU |
| 1 J | 0.0009478171203 BTU |
| 2 J | 0.001895634241 BTU |
| 3 J | 0.002843451361 BTU |
| 5 J | 0.004739085602 BTU |
| 10 J | 0.009478171203 BTU |
| 20 J | 0.01895634241 BTU |
| 50 J | 0.04739085602 BTU |
| 100 J | 0.09478171203 BTU |
| 1,000 J | 0.9478171203 BTU |
What is a joule?
The joule is the SI unit of energy: the work done by a force of one newton acting over one meter.
What is a British thermal unit?
The BTU is the energy needed to raise one pound of water by one degree Fahrenheit — about 1,055 joules. It rates heating and air-conditioning equipment in the US.
Frequently asked questions
How many BTU are in a joule?
1 joules equals 0.0009478171203 BTU. Going the other way, 1 BTU is 1,055.055853 joules.
How do you convert joules to BTU?
To convert joules to British thermal units, multiply the joule value by 0.0009478171203. You can also divide by 1055.055853 to get the same answer.
What is 10 joules in BTU?
10 joules equals 0.009478171203 BTU. The conversion chart on this page lists the other values people look up most often.
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