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 to Joules
Convert British thermal unit (BTU) to Joule (J) instantly with an exact formula, conversion table, and FAQ.
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Convert btu (BTU) to joules (J) instantly with formula, conversion table, and FAQ.
Context values
Some unit families need one extra value for a physically accurate result.
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.
J = BTU × 1055.055853
Results update instantly for Btu to Joules conversions.
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Formula
J = BTU × 1055.055853
BTU = J × 0.0009478171203
Conversion table
| 1 BTU | 1055.055853 J |
| 5 BTU | 5275.279263 J |
| 10 BTU | 10550.558526 J |
| 20 BTU | 21101.117052 J |
| 50 BTU | 52752.792631 J |
| 100 BTU | 105505.585262 J |
| 500 BTU | 527527.926310 J |
| 1000 BTU | 1.055056e+06 J |
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How the formula works
Both british thermal unit and joule measure the same physical quantity, so converting between them is a single multiplication. Multiply a value in btu by 1055.055853 to get joules. To reverse the conversion, multiply a joule value by 0.0009478171203 to get back to btu.
Frequently asked questions
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.
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.
How do I convert btu to joules?
Multiply the british thermal unit value by 1055.055853 to get the equivalent in joules. For example, 5 BTU × 1055.055853 = 5275.279263 J.
Is this conversion exact?
Yes. Both units are defined against the SI base unit for this dimension, so the factor 1055.055853 is an exact, non-rounded value.
Can I convert joules back to btu?
Yes. Divide the joule value by 1055.055853, or multiply it by 0.0009478171203, to get btu.
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About converting btu to joules
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. 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.
Use this calculator to move between btu and joules accurately for homework, engineering, billing, or everyday energy calculations. The Universal Converter uses exact unit factors, so results stay consistent across the site.