Zettajoule is 1e+21 joule units.
Zettajoules to Exajoules Converter — ZJ to EJ
Convert Zettajoule (ZJ) to Exajoule (EJ) using the exact conversion factor (1 zettajoule = 1,000 exajoule). See the formula, worked examples, and conversion table.
Zettajoules to Exajoules converter
Converter
Energy Converter
Convert joules, calories, kilowatt-hours, BTU, electronvolts, therms, and mechanical work units.
Context values
Some unit families need one extra value for a physically accurate result.
Exajoule is 1000000000000000000 joule units.
Result = input x 1e+21 / 1e+18.
Energy uses the joule as the base unit.
Reserved above the conversion cards and below the converter.
About Converting Zettajoules to Exajoules
Zettajoule and Exajoule both measure energy, and the conversion is especially useful for comparing nutrition labels (kilocalories) against scientific energy figures (joules). Specifically: Zettajoule is 1e+21 joule units, and exajoule is 1000000000000000000 joule units.
Formula
exajoules = zettajoules × 1000
This factor comes from each unit's defined relationship to the category's base unit: 1 zettajoule equals 1e+21 base units, and 1 exajoule equals 1e+18 base units, so dividing one by the other gives the direct zettajoule-to-exajoule factor of 1000.
Simple example
1 ZJ × 1000 = 1,000 EJ
1 zettajoule = 1,000 exajoules.
Real-world example
100 ZJ × 1000 = 100,000 EJ
100 zettajoules = 100,000 exajoules.
Conversion table
| Zettajoule (ZJ) | Exajoule (EJ) |
|---|---|
| 1 ZJ | 1,000 EJ |
| 10 ZJ | 10,000 EJ |
| 100 ZJ | 100,000 EJ |
| 500 ZJ | 500,000 EJ |
| 1,000 ZJ | 1,000,000 EJ |
| 2,000 ZJ | 2,000,000 EJ |
Reverse conversion: Exajoule to Zettajoule
1 EJ × 0.001 = 0.001 ZJ
1 exajoule = 0.001 zettajoules.
zettajoules = exajoules × 0.001
For a page dedicated to this direction, see Exajoule to Zettajoule.
Understanding the Zettajoule (ZJ)
Zettajoule is 1e+21 joule units.
Understanding the Exajoule (EJ)
Exajoule is 1000000000000000000 joule units.
Reserved between the cards and the FAQ so the page stays balanced.
Frequently asked questions
How many exajoules are in 1 zettajoule?
1 zettajoule equals 1,000 exajoules, using the exact defined conversion factor rather than an estimate.
How do I convert zettajoule to exajoule?
Multiply the zettajoule value by 1000. The converter above does this instantly to whatever precision you set.
How do I convert exajoule back to zettajoule?
Use the reverse factor: 1 exajoule equals 0.001 zettajoules. You can also use the swap control in the converter above to flip the direction instantly.
What is a zettajoule?
Zettajoule (ZJ) is a unit of energy.
What is a exajoule?
Exajoule (EJ) is a unit of energy.
Is the zettajoule to exajoule conversion exact?
Yes. Both zettajoule and exajoule are defined by fixed standards rather than physical artifacts, so the factor of 1000 used above is exact to as many digits as you choose to display.