Picojoule is 1e-12 joule units.
Picojoules to Zeptojoules Converter — pJ to zJ
Convert Picojoule (pJ) to Zeptojoule (zJ) using the exact conversion factor (1 picojoule = 1,000,000,000 zeptojoule). See the formula, worked examples, and conversion table.
Picojoules to Zeptojoules 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.
Zeptojoule is 1e-21 joule units.
Result = input x 1e-12 / 1e-21.
Energy units are compatible.
Reserved above the conversion cards and below the converter.
About Converting Picojoules to Zeptojoules
Picojoule and Zeptojoule 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: Picojoule is 1e-12 joule units, and zeptojoule is 1e-21 joule units.
Formula
zeptojoules = picojoules × 1000000000
This factor comes from each unit's defined relationship to the category's base unit: 1 picojoule equals 1e-12 base units, and 1 zeptojoule equals 1e-21 base units, so dividing one by the other gives the direct picojoule-to-zeptojoule factor of 1000000000.
Simple example
1 pJ × 1000000000 = 1,000,000,000 zJ
1 picojoule = 1,000,000,000 zeptojoules.
Real-world example
100 pJ × 1000000000 = 100,000,000,000 zJ
100 picojoules = 100,000,000,000 zeptojoules.
Conversion table
| Picojoule (pJ) | Zeptojoule (zJ) |
|---|---|
| 1 pJ | 1,000,000,000 zJ |
| 10 pJ | 10,000,000,000 zJ |
| 50 pJ | 50,000,000,000 zJ |
| 100 pJ | 100,000,000,000 zJ |
| 500 pJ | 500,000,000,000 zJ |
| 1,000 pJ | 1e+12 zJ |
Reverse conversion: Zeptojoule to Picojoule
1 zJ × 1e-9 = 1e-9 pJ
1 zeptojoule = 1e-9 picojoules.
picojoules = zeptojoules × 1e-9
For a page dedicated to this direction, see Zeptojoule to Picojoule.
Understanding the Picojoule (pJ)
Picojoule is 1e-12 joule units.
Understanding the Zeptojoule (zJ)
Zeptojoule is 1e-21 joule units.
Reserved between the cards and the FAQ so the page stays balanced.
Frequently asked questions
How many zeptojoules are in 1 picojoule?
1 picojoule equals 1,000,000,000 zeptojoules, using the exact defined conversion factor rather than an estimate.
How do I convert picojoule to zeptojoule?
Multiply the picojoule value by 1000000000. The converter above does this instantly to whatever precision you set.
How do I convert zeptojoule back to picojoule?
Use the reverse factor: 1 zeptojoule equals 1e-9 picojoules. You can also use the swap control in the converter above to flip the direction instantly.
What is a picojoule?
Picojoule (pJ) is a unit of engineering.
What is a zeptojoule?
Zeptojoule (zJ) is a unit of engineering.
Is the picojoule to zeptojoule conversion exact?
Yes. Both picojoule and zeptojoule 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.
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.