A exajoule (EJ) is a metric-prefixed unit of energy equal to 1018 joules, using the SI exa prefix.
Exajoules to Zeptojoules
Convert Exajoule (EJ) to Zeptojoule (zJ) instantly with an exact formula, conversion table, and FAQ.
Reserved for a responsive leaderboard above the conversion details.
Professional calculator style
World-scale conversion engine
30+ categories
6,500+ units
Instant results
Offline ready
Energy calculator
Energy Converter
Convert exajoules (EJ) to zeptojoules (zJ) instantly with formula, conversion table, and FAQ.
Context values
Some unit families need one extra value for a physically accurate result.
A zeptojoule (zJ) is a metric-prefixed unit of energy equal to 10-21 joules, a fraction of a single joule, using the SI zepto prefix.
zJ = EJ × 1.000000000e+39
Results update instantly for Exajoules to Zeptojoules conversions.
Reserved above the conversion cards and below the converter.
Formula
zJ = EJ × 1.000000000e+39
EJ = zJ × 1.000000000e-39
Conversion table
| 1 EJ | 1.000000e+39 zJ |
| 5 EJ | 5.000000e+39 zJ |
| 10 EJ | 1.000000e+40 zJ |
| 20 EJ | 2.000000e+40 zJ |
| 50 EJ | 5.000000e+40 zJ |
| 100 EJ | 1.000000e+41 zJ |
| 500 EJ | 5.000000e+41 zJ |
| 1000 EJ | 1.000000e+42 zJ |
Related conversions
Reserved between the cards and the FAQ so the page stays balanced.
How the formula works
Both exajoule and zeptojoule measure the same physical quantity, so converting between them is a single multiplication. Multiply a value in exajoules by 1.000000000e+39 to get zeptojoules. To reverse the conversion, multiply a zeptojoule value by 1.000000000e-39 to get back to exajoules.
Frequently asked questions
What is Exajoule (EJ)?
A exajoule (EJ) is a metric-prefixed unit of energy equal to 1018 joules, using the SI exa prefix.
What is Zeptojoule (zJ)?
A zeptojoule (zJ) is a metric-prefixed unit of energy equal to 10-21 joules, a fraction of a single joule, using the SI zepto prefix.
How do I convert exajoules to zeptojoules?
Multiply the exajoule value by 1.000000000e+39 to get the equivalent in zeptojoules. For example, 5 EJ × 1.000000000e+39 = 5.000000e+39 zJ.
Is this conversion exact?
Yes. Both units are defined against the SI base unit for this dimension, so the factor 1.000000000e+39 is an exact, non-rounded value.
Can I convert zeptojoules back to exajoules?
Yes. Divide the zeptojoule value by 1.000000000e+39, or multiply it by 1.000000000e-39, to get exajoules.
Reserved between the FAQ and the article so the page stays balanced.
About converting exajoules to zeptojoules
A exajoule (EJ) is a metric-prefixed unit of energy equal to 1018 joules, using the SI exa prefix. A zeptojoule (zJ) is a metric-prefixed unit of energy equal to 10-21 joules, a fraction of a single joule, using the SI zepto prefix.
Use this calculator to move between exajoules and zeptojoules accurately for homework, engineering, billing, or everyday energy calculations. The Universal Converter uses exact unit factors, so results stay consistent across the site.