A exajoule (EJ) is a metric-prefixed unit of energy equal to 1018 joules, using the SI exa prefix.
Exajoules to Watt hours
Convert Exajoule (EJ) to Watt-hour (Wh) instantly with an exact formula, conversion table, and FAQ.
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Convert exajoules (EJ) to watt hours (Wh) instantly with formula, conversion table, and FAQ.
Context values
Some unit families need one extra value for a physically accurate result.
A watt-hour (Wh) is the energy delivered by one watt of power sustained for one hour, equal to 3,600 joules.
Wh = EJ × 277777777777778
Results update instantly for Exajoules to Watt hours conversions.
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Formula
Wh = EJ × 277777777777778
EJ = Wh × 3.600000000e-15
Conversion table
| 1 EJ | 2.777778e+14 Wh |
| 5 EJ | 1.388889e+15 Wh |
| 10 EJ | 2.777778e+15 Wh |
| 20 EJ | 5.555556e+15 Wh |
| 50 EJ | 1.388889e+16 Wh |
| 100 EJ | 2.777778e+16 Wh |
| 500 EJ | 1.388889e+17 Wh |
| 1000 EJ | 2.777778e+17 Wh |
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How the formula works
Both exajoule and watt-hour measure the same physical quantity, so converting between them is a single multiplication. Multiply a value in exajoules by 277777777777778 to get watt hours. To reverse the conversion, multiply a watt-hour value by 3.600000000e-15 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 Watt-hour (Wh)?
A watt-hour (Wh) is the energy delivered by one watt of power sustained for one hour, equal to 3,600 joules.
How do I convert exajoules to watt hours?
Multiply the exajoule value by 277777777777778 to get the equivalent in watt hours. For example, 5 EJ × 277777777777778 = 1.388889e+15 Wh.
Is this conversion exact?
Yes. Both units are defined against the SI base unit for this dimension, so the factor 277777777777778 is an exact, non-rounded value.
Can I convert watt hours back to exajoules?
Yes. Divide the watt-hour value by 277777777777778, or multiply it by 3.600000000e-15, to get exajoules.
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About converting exajoules to watt hours
A exajoule (EJ) is a metric-prefixed unit of energy equal to 1018 joules, using the SI exa prefix. A watt-hour (Wh) is the energy delivered by one watt of power sustained for one hour, equal to 3,600 joules.
Use this calculator to move between exajoules and watt hours accurately for homework, engineering, billing, or everyday energy calculations. The Universal Converter uses exact unit factors, so results stay consistent across the site.