Gigajoule is 1000000000 joule units.
Gigajoules to Exajoules Converter — GJ to EJ
Convert Gigajoule (GJ) to Exajoule (EJ) using the exact conversion factor (1 gigajoule = 1e-9 exajoule). See the formula, worked examples, and conversion table.
Gigajoules 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+9 / 1e+18.
Energy uses the joule as the base unit.
Reserved above the conversion cards and below the converter.
About Converting Gigajoules to Exajoules
Gigajoule and Exajoule 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 exajoule is 1000000000000000000 joule units.
Formula
exajoules = gigajoules × 1e-9
This factor comes from each unit's defined relationship to the category's base unit: 1 gigajoule equals 1000000000 base units, and 1 exajoule equals 1e+18 base units, so dividing one by the other gives the direct gigajoule-to-exajoule factor of 1e-9.
Simple example
1 GJ × 1e-9 = 1e-9 EJ
1 gigajoule = 1e-9 exajoules.
Real-world example
100 GJ × 1e-9 = 1e-7 EJ
100 gigajoules = 1e-7 exajoules.
Conversion table
| Gigajoule (GJ) | Exajoule (EJ) |
|---|---|
| 1 GJ | 1e-9 EJ |
| 10 GJ | 1e-8 EJ |
| 100 GJ | 1e-7 EJ |
| 500 GJ | 5e-7 EJ |
| 1,000 GJ | 0.000001 EJ |
| 2,000 GJ | 0.000002 EJ |
Reverse conversion: Exajoule to Gigajoule
1e-9 EJ × 1000000000 = 1 GJ
1e-9 exajoules = 1 gigajoules.
gigajoules = exajoules × 1000000000
For a page dedicated to this direction, see Exajoule to Gigajoule.
Understanding the Gigajoule (GJ)
Gigajoule is 1000000000 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 gigajoule?
1 gigajoule equals 1e-9 exajoules, using the exact defined conversion factor rather than an estimate.
How do I convert gigajoule to exajoule?
Multiply the gigajoule value by 1e-9. The converter above does this instantly to whatever precision you set.
How do I convert exajoule back to gigajoule?
Use the reverse factor: 1 exajoule equals 1,000,000,000 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 exajoule?
Exajoule (EJ) is a unit of energy.
Is the gigajoule to exajoule conversion exact?
Yes. Both gigajoule and exajoule are defined by fixed standards rather than physical artifacts, so the factor of 1e-9 used above is exact to as many digits as you choose to display.