Gigajoule is 1000000000 joule units.
Gigajoules to Zettajoules Converter — GJ to ZJ
Convert Gigajoule (GJ) to Zettajoule (ZJ) using the exact conversion factor (1 gigajoule = 1e-12 zettajoule). See the formula, worked examples, and conversion table.
Gigajoules to Zettajoules 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.
Zettajoule is 1e+21 joule units.
Result = input x 1e+9 / 1e+21.
Energy uses the joule as the base unit.
Reserved above the conversion cards and below the converter.
About Converting Gigajoules to Zettajoules
Gigajoule and Zettajoule both measure energy, and the conversion is especially useful for comparing nutrition labels (kilocalories) against scientific energy figures (joules). Specifically: Gigajoule is 1000000000 joule units, and zettajoule is 1e+21 joule units.
Formula
zettajoules = gigajoules × 1e-12
This factor comes from each unit's defined relationship to the category's base unit: 1 gigajoule equals 1000000000 base units, and 1 zettajoule equals 1e+21 base units, so dividing one by the other gives the direct gigajoule-to-zettajoule factor of 1e-12.
Simple example
1 GJ × 1e-12 = 1e-12 ZJ
1 gigajoule = 1e-12 zettajoules.
Real-world example
100 GJ × 1e-12 = 1e-10 ZJ
100 gigajoules = 1e-10 zettajoules.
Conversion table
| Gigajoule (GJ) | Zettajoule (ZJ) |
|---|---|
| 1 GJ | 1e-12 ZJ |
| 10 GJ | 1e-11 ZJ |
| 100 GJ | 1e-10 ZJ |
| 500 GJ | 5e-10 ZJ |
| 1,000 GJ | 1e-9 ZJ |
| 2,000 GJ | 2e-9 ZJ |
Reverse conversion: Zettajoule to Gigajoule
1e-12 ZJ × 1e+12 = 1 GJ
1e-12 zettajoules = 1 gigajoule.
gigajoules = zettajoules × 1e+12
For a page dedicated to this direction, see Zettajoule to Gigajoule.
Understanding the Gigajoule (GJ)
Gigajoule is 1000000000 joule units.
Understanding the Zettajoule (ZJ)
Zettajoule is 1e+21 joule units.
Reserved between the cards and the FAQ so the page stays balanced.
Frequently asked questions
How many zettajoules are in 1 gigajoule?
1 gigajoule equals 1e-12 zettajoules, using the exact defined conversion factor rather than an estimate.
How do I convert gigajoule to zettajoule?
Multiply the gigajoule value by 1e-12. The converter above does this instantly to whatever precision you set.
How do I convert zettajoule back to gigajoule?
Use the reverse factor: 1 zettajoule equals 1e+12 gigajoules. You can also use the swap control in the converter above to flip the direction instantly.
What is a gigajoule?
Gigajoule (GJ) is a unit of energy.
What is a zettajoule?
Zettajoule (ZJ) is a unit of energy.
Is the gigajoule to zettajoule conversion exact?
Yes. Both gigajoule and zettajoule are defined by fixed standards rather than physical artifacts, so the factor of 1e-12 used above is exact to as many digits as you choose to display.