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 Exajoules
Convert Joule (J) to Exajoule (EJ) instantly with an exact formula, conversion table, and FAQ.
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Convert joules (J) 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 = J × 1.000000000e-18
Results update instantly for Joules to Exajoules conversions.
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Formula
EJ = J × 1.000000000e-18
J = EJ × 1.000000000e+18
Conversion table
| 1 J | 1.000000e-18 EJ |
| 5 J | 5.000000e-18 EJ |
| 10 J | 1.000000e-17 EJ |
| 20 J | 2.000000e-17 EJ |
| 50 J | 5.000000e-17 EJ |
| 100 J | 1.000000e-16 EJ |
| 500 J | 5.000000e-16 EJ |
| 1000 J | 1.000000e-15 EJ |
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How the formula works
Both joule and exajoule measure the same physical quantity, so converting between them is a single multiplication. Multiply a value in joules by 1.000000000e-18 to get exajoules. To reverse the conversion, multiply a exajoule value by 1.000000000e+18 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 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 joules to exajoules?
Multiply the joule value by 1.000000000e-18 to get the equivalent in exajoules. For example, 5 J × 1.000000000e-18 = 5.000000e-18 EJ.
Is this conversion exact?
Yes. Both units are defined against the SI base unit for this dimension, so the factor 1.000000000e-18 is an exact, non-rounded value.
Can I convert exajoules back to joules?
Yes. Divide the exajoule value by 1.000000000e-18, or multiply it by 1.000000000e+18, to get joules.
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About converting joules to exajoules
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. 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 joules 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.