The joule (J) is the SI derived unit of energy, equal to the work done when a force of one newton acts over one meter.
Joules to Btu
Convert Joule (J) to British thermal unit (BTU) instantly with an exact formula, conversion table, and FAQ.
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Convert joules (J) to btu (BTU) instantly with formula, conversion table, and FAQ.
Context values
Some unit families need one extra value for a physically accurate result.
The British thermal unit (BTU) is the energy needed to raise one pound of water by one degree Fahrenheit, widely used for heating and air-conditioning ratings.
BTU = J × 0.0009478171203
Results update instantly for Joules to Btu conversions.
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Formula
BTU = J × 0.0009478171203
J = BTU × 1055.055853
Conversion table
| 1 J | 0.000948 BTU |
| 5 J | 0.004739 BTU |
| 10 J | 0.009478 BTU |
| 20 J | 0.018956 BTU |
| 50 J | 0.047391 BTU |
| 100 J | 0.094782 BTU |
| 500 J | 0.473909 BTU |
| 1000 J | 0.947817 BTU |
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How the formula works
Both joule and british thermal unit measure the same physical quantity, so converting between them is a single multiplication. Multiply a value in joules by 0.0009478171203 to get btu. To reverse the conversion, multiply a british thermal unit value by 1055.055853 to get back to joules.
Frequently asked questions
What is Joule (J)?
The joule (J) is the SI derived unit of energy, equal to the work done when a force of one newton acts over one meter.
What is British thermal unit (BTU)?
The British thermal unit (BTU) is the energy needed to raise one pound of water by one degree Fahrenheit, widely used for heating and air-conditioning ratings.
How do I convert joules to btu?
Multiply the joule value by 0.0009478171203 to get the equivalent in btu. For example, 5 J × 0.0009478171203 = 0.004739 BTU.
Is this conversion exact?
Yes. Both units are defined against the SI base unit for this dimension, so the factor 0.0009478171203 is an exact, non-rounded value.
Can I convert btu back to joules?
Yes. Divide the british thermal unit value by 0.0009478171203, or multiply it by 1055.055853, to get joules.
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About converting joules to btu
The joule (J) is the SI derived unit of energy, equal to the work done when a force of one newton acts over one meter. The British thermal unit (BTU) is the energy needed to raise one pound of water by one degree Fahrenheit, widely used for heating and air-conditioning ratings.
Use this calculator to move between joules and btu accurately for homework, engineering, billing, or everyday energy calculations. The Universal Converter uses exact unit factors, so results stay consistent across the site.