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 0.000947817 British thermal units. Going the other way, 1 British thermal unit = 1,055.06 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 = 0.0142173 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 | 0.00000947817 BTU |
| 0.1 J | 0.0000947817 BTU |
| 1 J | 0.000947817 BTU |
| 2 J | 0.00189563 BTU |
| 3 J | 0.00284345 BTU |
| 5 J | 0.00473909 BTU |
| 10 J | 0.00947817 BTU |
| 20 J | 0.0189563 BTU |
| 50 J | 0.0473909 BTU |
| 100 J | 0.0947817 BTU |
| 1,000 J | 0.947817 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 0.000947817 BTU. Going the other way, 1 BTU is 1,055.06 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 0.00947817 BTU. The conversion chart on this page lists the other values people look up most often.
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