Petajoule is 1000000000000000 joule units.
Petajoules to Zettajoules Converter — PJ to ZJ
Convert Petajoule (PJ) to Zettajoule (ZJ) using the exact conversion factor (1 petajoule = 0.000001 zettajoule). See the formula, worked examples, and conversion table.
Petajoules to Zettajoules 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.
Zettajoule is 1e+21 joule units.
Result = input x 1e+15 / 1e+21.
Energy units are compatible.
Reserved above the conversion cards and below the converter.
About Converting Petajoules to Zettajoules
Petajoule and Zettajoule 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 zettajoule is 1e+21 joule units.
Formula
zettajoules = petajoules × 0.000001
This factor comes from each unit's defined relationship to the category's base unit: 1 petajoule equals 1e+15 base units, and 1 zettajoule equals 1e+21 base units, so dividing one by the other gives the direct petajoule-to-zettajoule factor of 0.000001.
Simple example
1 PJ × 0.000001 = 0.000001 ZJ
1 petajoule = 0.000001 zettajoules.
Real-world example
100 PJ × 0.000001 = 0.0001 ZJ
100 petajoules = 0.0001 zettajoules.
Conversion table
| Petajoule (PJ) | Zettajoule (ZJ) |
|---|---|
| 1 PJ | 0.000001 ZJ |
| 10 PJ | 0.00001 ZJ |
| 50 PJ | 0.00005 ZJ |
| 100 PJ | 0.0001 ZJ |
| 500 PJ | 0.0005 ZJ |
| 1,000 PJ | 0.001 ZJ |
Reverse conversion: Zettajoule to Petajoule
0.000001 ZJ × 1000000 = 1 PJ
0.000001 zettajoules = 1 petajoule.
petajoules = zettajoules × 1000000
For a page dedicated to this direction, see Zettajoule to Petajoule.
Understanding the Petajoule (PJ)
Petajoule is 1000000000000000 joule units.
Understanding the Zettajoule (ZJ)
Zettajoule is 1e+21 joule units.
Reserved between the cards and the FAQ so the page stays balanced.
Frequently asked questions
How many zettajoules are in 1 petajoule?
1 petajoule equals 0.000001 zettajoules, using the exact defined conversion factor rather than an estimate.
How do I convert petajoule to zettajoule?
Multiply the petajoule value by 0.000001. The converter above does this instantly to whatever precision you set.
How do I convert zettajoule back to petajoule?
Use the reverse factor: 1 zettajoule equals 1,000,000 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 zettajoule?
Zettajoule (ZJ) is a unit of engineering.
Is the petajoule to zettajoule conversion exact?
Yes. Both petajoule and zettajoule are defined by fixed standards rather than physical artifacts, so the factor of 0.000001 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.