Megajoule is 1000000 joule units.
Megajoules to Ronnajoules Converter — MJ to RJ
Convert Megajoule (MJ) to Ronnajoule (RJ) using the exact conversion factor (1 megajoule = 1e-21 ronnajoule). See the formula, worked examples, and conversion table.
Megajoules to Ronnajoules 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.
Ronnajoule is 1e+27 joule units.
Result = input x 1e+6 / 1e+27.
Energy uses the joule as the base unit.
Reserved above the conversion cards and below the converter.
About Converting Megajoules to Ronnajoules
Megajoule and Ronnajoule 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 ronnajoule is 1e+27 joule units.
Formula
ronnajoules = megajoules × 1e-21
This factor comes from each unit's defined relationship to the category's base unit: 1 megajoule equals 1000000 base units, and 1 ronnajoule equals 1e+27 base units, so dividing one by the other gives the direct megajoule-to-ronnajoule factor of 1e-21.
Simple example
1 MJ × 1e-21 = 1e-21 RJ
1 megajoule = 1e-21 ronnajoules.
Real-world example
100 MJ × 1e-21 = 1e-19 RJ
100 megajoules = 1e-19 ronnajoules.
Conversion table
| Megajoule (MJ) | Ronnajoule (RJ) |
|---|---|
| 1 MJ | 1e-21 RJ |
| 10 MJ | 1e-20 RJ |
| 100 MJ | 1e-19 RJ |
| 500 MJ | 5e-19 RJ |
| 1,000 MJ | 1e-18 RJ |
| 2,000 MJ | 2e-18 RJ |
Reverse conversion: Ronnajoule to Megajoule
1e-21 RJ × 1e+21 = 1 MJ
1e-21 ronnajoules = 1 megajoules.
megajoules = ronnajoules × 1e+21
For a page dedicated to this direction, see Ronnajoule to Megajoule.
Understanding the Megajoule (MJ)
Megajoule is 1000000 joule units.
Understanding the Ronnajoule (RJ)
Ronnajoule is 1e+27 joule units.
Reserved between the cards and the FAQ so the page stays balanced.
Frequently asked questions
How many ronnajoules are in 1 megajoule?
1 megajoule equals 1e-21 ronnajoules, using the exact defined conversion factor rather than an estimate.
How do I convert megajoule to ronnajoule?
Multiply the megajoule value by 1e-21. The converter above does this instantly to whatever precision you set.
How do I convert ronnajoule back to megajoule?
Use the reverse factor: 1 ronnajoule equals 1e+21 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 ronnajoule?
Ronnajoule (RJ) is a unit of energy.
Is the megajoule to ronnajoule conversion exact?
Yes. Both megajoule and ronnajoule are defined by fixed standards rather than physical artifacts, so the factor of 1e-21 used above is exact to as many digits as you choose to display.