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Unit Converters

Joules to BTU Converter

Convert joules (J) to BTU (BTU) instantly. 1 J = 0.0009478171203 BTU.

Free, no sign-upPrivate — runs in your browserUpdated October 2026
1 J = 0.0009478171203 BTU

In all energy units

Joule1 J
Kilojoule0.001 kJ
Calorie (small)0.2390057361 cal
Kilocalorie (food Calorie)0.0002390057361 kcal
Kilowatt-hour2.777778e-7 kWh
British thermal unit0.0009478171203 BTU

How to convert joules to BTU

Multiply the value in joules by 0.0009478171203 (or divide by 1,055.055853) to get BTU.

1 J = 0.0009478171203 BTU

Example

To convert 10 joules to BTU: 10 × 0.0009478171203 = 0.009478171203 BTU.

J to BTU conversion chart

Joules (J)BTU (BTU)
0.1 J0.00009478171203 BTU
0.25 J0.0002369542801 BTU
0.5 J0.0004739085602 BTU
1 J0.0009478171203 BTU
2 J0.001895634241 BTU
3 J0.002843451361 BTU
4 J0.003791268481 BTU
5 J0.004739085602 BTU
6 J0.005686902722 BTU
7 J0.006634719842 BTU
8 J0.007582536963 BTU
9 J0.008530354083 BTU
10 J0.009478171203 BTU
12 J0.01137380544 BTU
15 J0.0142172568 BTU
20 J0.01895634241 BTU
25 J0.02369542801 BTU
30 J0.02843451361 BTU
40 J0.03791268481 BTU
50 J0.04739085602 BTU
75 J0.07108628402 BTU
100 J0.09478171203 BTU
250 J0.2369542801 BTU
500 J0.4739085602 BTU
1,000 J0.9478171203 BTU

About the units

Joule (J)

The joule is the SI unit of energy: the work done by a force of one newton over one meter.

British thermal unit (BTU)

A BTU (IT) is about 1,055 joules, used for heating and air-conditioning capacity.

Related conversions

BTU to joules · Joules to kilojoules · Joules to calories · Joules to kilocalories · Joules to kilowatt-hours · Kilojoules to BTU · Calories to BTU · Kilocalories to BTU · Kilowatt-hours to BTU · All energy units

Frequently asked questions

How many BTU are in a joule?

There are 0.0009478171203 BTU in one joule. Multiply any value in joules by 0.0009478171203 to convert it to BTU.

What is 10 J in BTU?

10 joules equals 0.009478171203 BTU.

How do I convert BTU back to joules?

Multiply by 1,055.055853, since 1 BTU = 1,055.055853 J. You can also use our BTU to joules converter.

What is a joule?

The joule is the SI unit of energy: the work done by a force of one newton over one meter.