Megajoule is 1000000 joule units.
Megajoules to Ergs Converter — MJ to erg
Convert Megajoule (MJ) to Erg (erg) using the exact conversion factor (1 megajoule = 1e+13 erg). See the formula, worked examples, and conversion table.
Megajoules to Ergs 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.
An erg is a CGS energy unit.
Result = input x 1e+6 / 1e-7.
Energy uses the joule as the base unit.
Reserved above the conversion cards and below the converter.
About Converting Megajoules to Ergs
Megajoule and Erg 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 an erg is a CGS energy unit.
Formula
ergs = megajoules × 1e+13
This factor comes from each unit's defined relationship to the category's base unit: 1 megajoule equals 1000000 base units, and 1 erg equals 1e-7 base units, so dividing one by the other gives the direct megajoule-to-erg factor of 1e+13.
Simple example
1 MJ × 1e+13 = 1e+13 erg
1 megajoule = 1e+13 ergs.
Real-world example
100 MJ × 1e+13 = 1e+15 erg
100 megajoules = 1e+15 ergs.
Conversion table
| Megajoule (MJ) | Erg (erg) |
|---|---|
| 1 MJ | 1e+13 erg |
| 10 MJ | 1e+14 erg |
| 100 MJ | 1e+15 erg |
| 500 MJ | 5e+15 erg |
| 1,000 MJ | 1e+16 erg |
| 2,000 MJ | 2e+16 erg |
Reverse conversion: Erg to Megajoule
1e+13 erg × 1e-13 = 1 MJ
1e+13 ergs = 1 megajoule.
megajoules = ergs × 1e-13
For a page dedicated to this direction, see Erg to Megajoule.
Understanding the Megajoule (MJ)
Megajoule is 1000000 joule units.
Understanding the Erg (erg)
An erg is a CGS energy unit.
Reserved between the cards and the FAQ so the page stays balanced.
Frequently asked questions
How many ergs are in 1 megajoule?
1 megajoule equals 1e+13 ergs, using the exact defined conversion factor rather than an estimate.
How do I convert megajoule to erg?
Multiply the megajoule value by 1e+13. The converter above does this instantly to whatever precision you set.
How do I convert erg back to megajoule?
Use the reverse factor: 1 erg equals 1e-13 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 erg?
Erg (erg) is a unit of energy.
Is the megajoule to erg conversion exact?
Yes. Both megajoule and erg are defined by fixed standards rather than physical artifacts, so the factor of 1e+13 used above is exact to as many digits as you choose to display.