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 Exajoules
Convert British thermal unit (BTU) to Exajoule (EJ) instantly with an exact formula, conversion table, and FAQ.
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Convert btu (BTU) to exajoules (EJ) instantly with formula, conversion table, and FAQ.
Context values
Some unit families need one extra value for a physically accurate result.
A exajoule (EJ) is a metric-prefixed unit of energy equal to 1018 joules, using the SI exa prefix.
EJ = BTU × 1.055055853e-15
Results update instantly for Btu to Exajoules conversions.
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Formula
EJ = BTU × 1.055055853e-15
BTU = EJ × 947817120313317
Conversion table
| 1 BTU | 1.055056e-15 EJ |
| 5 BTU | 5.275279e-15 EJ |
| 10 BTU | 1.055056e-14 EJ |
| 20 BTU | 2.110112e-14 EJ |
| 50 BTU | 5.275279e-14 EJ |
| 100 BTU | 1.055056e-13 EJ |
| 500 BTU | 5.275279e-13 EJ |
| 1000 BTU | 1.055056e-12 EJ |
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How the formula works
Both british thermal unit and exajoule measure the same physical quantity, so converting between them is a single multiplication. Multiply a value in btu by 1.055055853e-15 to get exajoules. To reverse the conversion, multiply a exajoule value by 947817120313317 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 Exajoule (EJ)?
A exajoule (EJ) is a metric-prefixed unit of energy equal to 1018 joules, using the SI exa prefix.
How do I convert btu to exajoules?
Multiply the british thermal unit value by 1.055055853e-15 to get the equivalent in exajoules. For example, 5 BTU × 1.055055853e-15 = 5.275279e-15 EJ.
Is this conversion exact?
Yes. Both units are defined against the SI base unit for this dimension, so the factor 1.055055853e-15 is an exact, non-rounded value.
Can I convert exajoules back to btu?
Yes. Divide the exajoule value by 1.055055853e-15, or multiply it by 947817120313317, to get btu.
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About converting btu to exajoules
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. A exajoule (EJ) is a metric-prefixed unit of energy equal to 1018 joules, using the SI exa prefix.
Use this calculator to move between btu and exajoules accurately for homework, engineering, billing, or everyday energy calculations. The Universal Converter uses exact unit factors, so results stay consistent across the site.