Megajoule is 1000000 joule units.
Megajoules to Exajoules Converter — MJ to EJ
Convert Megajoule (MJ) to Exajoule (EJ) using the exact conversion factor (1 megajoule = 1e-12 exajoule). See the formula, worked examples, and conversion table.
Megajoules 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+6 / 1e+18.
Energy uses the joule as the base unit.
Reserved above the conversion cards and below the converter.
About Converting Megajoules to Exajoules
Megajoule and Exajoule both measure energy, and the conversion is especially useful for comparing nutrition labels (kilocalories) against scientific energy figures (joules). Specifically: Megajoule is 1000000 joule units, and exajoule is 1000000000000000000 joule units.
Formula
exajoules = megajoules × 1e-12
This factor comes from each unit's defined relationship to the category's base unit: 1 megajoule equals 1000000 base units, and 1 exajoule equals 1e+18 base units, so dividing one by the other gives the direct megajoule-to-exajoule factor of 1e-12.
Simple example
1 MJ × 1e-12 = 1e-12 EJ
1 megajoule = 1e-12 exajoules.
Real-world example
100 MJ × 1e-12 = 1e-10 EJ
100 megajoules = 1e-10 exajoules.
Conversion table
| Megajoule (MJ) | Exajoule (EJ) |
|---|---|
| 1 MJ | 1e-12 EJ |
| 10 MJ | 1e-11 EJ |
| 100 MJ | 1e-10 EJ |
| 500 MJ | 5e-10 EJ |
| 1,000 MJ | 1e-9 EJ |
| 2,000 MJ | 2e-9 EJ |
Reverse conversion: Exajoule to Megajoule
1e-12 EJ × 1e+12 = 1 MJ
1e-12 exajoules = 1 megajoule.
megajoules = exajoules × 1e+12
For a page dedicated to this direction, see Exajoule to Megajoule.
Understanding the Megajoule (MJ)
Megajoule is 1000000 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 megajoule?
1 megajoule equals 1e-12 exajoules, using the exact defined conversion factor rather than an estimate.
How do I convert megajoule to exajoule?
Multiply the megajoule value by 1e-12. The converter above does this instantly to whatever precision you set.
How do I convert exajoule back to megajoule?
Use the reverse factor: 1 exajoule equals 1e+12 megajoules. You can also use the swap control in the converter above to flip the direction instantly.
What is a megajoule?
Megajoule (MJ) is a unit of energy.
What is a exajoule?
Exajoule (EJ) is a unit of energy.
Is the megajoule to exajoule conversion exact?
Yes. Both megajoule and exajoule 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.