Petajoule is 1000000000000000 joule units.
Petajoules to Microjoules Converter — PJ to uJ
Convert Petajoule (PJ) to Microjoule (uJ) using the exact conversion factor (1 petajoule = 1e+21 microjoule). See the formula, worked examples, and conversion table.
Petajoules to Microjoules 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.
Microjoule is 0.000001 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 Microjoules
Petajoule and Microjoule 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 microjoule is 0.000001 joule units.
Formula
microjoules = petajoules × 1e+21
This factor comes from each unit's defined relationship to the category's base unit: 1 petajoule equals 1e+15 base units, and 1 microjoule equals 0.000001 base units, so dividing one by the other gives the direct petajoule-to-microjoule factor of 1e+21.
Simple example
1 PJ × 1e+21 = 1e+21 uJ
1 petajoule = 1e+21 microjoules.
Real-world example
100 PJ × 1e+21 = 1e+23 uJ
100 petajoules = 1e+23 microjoules.
Conversion table
| Petajoule (PJ) | Microjoule (uJ) |
|---|---|
| 1 PJ | 1e+21 uJ |
| 10 PJ | 1e+22 uJ |
| 100 PJ | 1e+23 uJ |
| 500 PJ | 5e+23 uJ |
| 1,000 PJ | 1e+24 uJ |
| 2,000 PJ | 2e+24 uJ |
Reverse conversion: Microjoule to Petajoule
1e+21 uJ × 1e-21 = 1 PJ
1e+21 microjoules = 1 petajoule.
petajoules = microjoules × 1e-21
For a page dedicated to this direction, see Microjoule to Petajoule.
Understanding the Petajoule (PJ)
Petajoule is 1000000000000000 joule units.
Understanding the Microjoule (uJ)
Microjoule is 0.000001 joule units.
Reserved between the cards and the FAQ so the page stays balanced.
Frequently asked questions
How many microjoules are in 1 petajoule?
1 petajoule equals 1e+21 microjoules, using the exact defined conversion factor rather than an estimate.
How do I convert petajoule to microjoule?
Multiply the petajoule value by 1e+21. The converter above does this instantly to whatever precision you set.
How do I convert microjoule back to petajoule?
Use the reverse factor: 1 microjoule equals 1e-21 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 microjoule?
Microjoule (uJ) is a unit of energy.
Is the petajoule to microjoule conversion exact?
Yes. Both petajoule and microjoule 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.