Petajoule is 1000000000000000 joule units.
Petajoules to Exajoules Converter — PJ to EJ
Convert Petajoule (PJ) to Exajoule (EJ) using the exact conversion factor (1 petajoule = 0.001 exajoule). See the formula, worked examples, and conversion table.
Petajoules to Exajoules converter
Converter
Engineering Converter
Convert common stress, force, torque, power, and energy units used in engineering.
Context values
Some unit families need one extra value for a physically accurate result.
Exajoule is 1000000000000000000 joule units.
Result = input x 1e+15 / 1e+18.
Energy units are compatible.
Reserved above the conversion cards and below the converter.
About Converting Petajoules to Exajoules
Petajoule and Exajoule both measure a quantity used in structural or mechanical engineering — commonly stress, pressure, force, torque, power, or energy — where converting between the unit conventions used in different regions, industries, or equipment specifications is a routine part of design work. Specifically: Petajoule is 1000000000000000 joule units, and exajoule is 1000000000000000000 joule units.
Formula
exajoules = petajoules × 0.001
This factor comes from each unit's defined relationship to the category's base unit: 1 petajoule equals 1e+15 base units, and 1 exajoule equals 1e+18 base units, so dividing one by the other gives the direct petajoule-to-exajoule factor of 0.001.
Simple example
1 PJ × 0.001 = 0.001 EJ
1 petajoule = 0.001 exajoules.
Real-world example
100 PJ × 0.001 = 0.1 EJ
100 petajoules = 0.1 exajoules.
Conversion table
| Petajoule (PJ) | Exajoule (EJ) |
|---|---|
| 1 PJ | 0.001 EJ |
| 10 PJ | 0.01 EJ |
| 50 PJ | 0.05 EJ |
| 100 PJ | 0.1 EJ |
| 500 PJ | 0.5 EJ |
| 1,000 PJ | 1 EJ |
Reverse conversion: Exajoule to Petajoule
0.001 EJ × 1000 = 1 PJ
0.001 exajoules = 1 petajoule.
petajoules = exajoules × 1000
For a page dedicated to this direction, see Exajoule to Petajoule.
Understanding the Petajoule (PJ)
Petajoule is 1000000000000000 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 petajoule?
1 petajoule equals 0.001 exajoules, using the exact defined conversion factor rather than an estimate.
How do I convert petajoule to exajoule?
Multiply the petajoule value by 0.001. The converter above does this instantly to whatever precision you set.
How do I convert exajoule back to petajoule?
Use the reverse factor: 1 exajoule equals 1,000 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 engineering.
What is a exajoule?
Exajoule (EJ) is a unit of engineering.
Is the petajoule to exajoule conversion exact?
Yes. Both petajoule and exajoule are defined by fixed standards rather than physical artifacts, so the factor of 0.001 used above is exact to as many digits as you choose to display.
Why do engineering unit conventions vary so much by region and industry?
Pressure, force, and stress can be expressed in metric (pascal, newton), US customary (psi, pound-force), or older and industry-specific units (atmosphere, torr, kip) depending on the country, industry, and even the equipment manufacturer, which is why engineers routinely need to convert between them when working across specs from different sources.