Petajoule is 1000000000000000 joule units.
Petajoules to Megajoules Converter — PJ to MJ
Convert Petajoule (PJ) to Megajoule (MJ) using the exact conversion factor (1 petajoule = 1,000,000,000 megajoule). See the formula, worked examples, and conversion table.
Petajoules to Megajoules 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.
Megajoule is 1000000 joule units.
Result = input x 1e+15 / 1e+6.
Energy uses the joule as the base unit.
Reserved above the conversion cards and below the converter.
About Converting Petajoules to Megajoules
Petajoule and Megajoule both measure energy, and the conversion is especially useful for comparing nutrition labels (kilocalories) against scientific energy figures (joules). Specifically: Petajoule is 1000000000000000 joule units, and megajoule is 1000000 joule units.
Formula
megajoules = petajoules × 1000000000
This factor comes from each unit's defined relationship to the category's base unit: 1 petajoule equals 1e+15 base units, and 1 megajoule equals 1000000 base units, so dividing one by the other gives the direct petajoule-to-megajoule factor of 1000000000.
Simple example
1 PJ × 1000000000 = 1,000,000,000 MJ
1 petajoule = 1,000,000,000 megajoules.
Real-world example
100 PJ × 1000000000 = 100,000,000,000 MJ
100 petajoules = 100,000,000,000 megajoules.
Conversion table
| Petajoule (PJ) | Megajoule (MJ) |
|---|---|
| 1 PJ | 1,000,000,000 MJ |
| 10 PJ | 10,000,000,000 MJ |
| 100 PJ | 100,000,000,000 MJ |
| 500 PJ | 500,000,000,000 MJ |
| 1,000 PJ | 1e+12 MJ |
| 2,000 PJ | 2e+12 MJ |
Reverse conversion: Megajoule to Petajoule
1 MJ × 1e-9 = 1e-9 PJ
1 megajoule = 1e-9 petajoules.
petajoules = megajoules × 1e-9
For a page dedicated to this direction, see Megajoule to Petajoule.
Understanding the Petajoule (PJ)
Petajoule is 1000000000000000 joule units.
Understanding the Megajoule (MJ)
Megajoule is 1000000 joule units.
Reserved between the cards and the FAQ so the page stays balanced.
Frequently asked questions
How many megajoules are in 1 petajoule?
1 petajoule equals 1,000,000,000 megajoules, using the exact defined conversion factor rather than an estimate.
How do I convert petajoule to megajoule?
Multiply the petajoule value by 1000000000. The converter above does this instantly to whatever precision you set.
How do I convert megajoule back to petajoule?
Use the reverse factor: 1 megajoule equals 1e-9 petajoules. You can also use the swap control in the converter above to flip the direction instantly.
What is a petajoule?
Petajoule (PJ) is a unit of energy.
What is a megajoule?
Megajoule (MJ) is a unit of energy.
Is the petajoule to megajoule conversion exact?
Yes. Both petajoule and megajoule are defined by fixed standards rather than physical artifacts, so the factor of 1000000000 used above is exact to as many digits as you choose to display.