Gigajoule is 1000000000 joule units.
Gigajoules to Petajoules Converter — GJ to PJ
Convert Gigajoule (GJ) to Petajoule (PJ) using the exact conversion factor (1 gigajoule = 0.000001 petajoule). See the formula, worked examples, and conversion table.
Gigajoules to Petajoules 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.
Petajoule is 1000000000000000 joule units.
Result = input x 1e+9 / 1e+15.
Energy units are compatible.
Reserved above the conversion cards and below the converter.
About Converting Gigajoules to Petajoules
Gigajoule and Petajoule 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: Gigajoule is 1000000000 joule units, and petajoule is 1000000000000000 joule units.
Formula
petajoules = gigajoules × 0.000001
This factor comes from each unit's defined relationship to the category's base unit: 1 gigajoule equals 1000000000 base units, and 1 petajoule equals 1e+15 base units, so dividing one by the other gives the direct gigajoule-to-petajoule factor of 0.000001.
Simple example
1 GJ × 0.000001 = 0.000001 PJ
1 gigajoule = 0.000001 petajoules.
Real-world example
100 GJ × 0.000001 = 0.0001 PJ
100 gigajoules = 0.0001 petajoules.
Conversion table
| Gigajoule (GJ) | Petajoule (PJ) |
|---|---|
| 1 GJ | 0.000001 PJ |
| 10 GJ | 0.00001 PJ |
| 50 GJ | 0.00005 PJ |
| 100 GJ | 0.0001 PJ |
| 500 GJ | 0.0005 PJ |
| 1,000 GJ | 0.001 PJ |
Reverse conversion: Petajoule to Gigajoule
0.000001 PJ × 1000000 = 1 GJ
0.000001 petajoules = 1 gigajoule.
gigajoules = petajoules × 1000000
For a page dedicated to this direction, see Petajoule to Gigajoule.
Understanding the Gigajoule (GJ)
Gigajoule is 1000000000 joule units.
Understanding the Petajoule (PJ)
Petajoule is 1000000000000000 joule units.
Reserved between the cards and the FAQ so the page stays balanced.
Frequently asked questions
How many petajoules are in 1 gigajoule?
1 gigajoule equals 0.000001 petajoules, using the exact defined conversion factor rather than an estimate.
How do I convert gigajoule to petajoule?
Multiply the gigajoule value by 0.000001. The converter above does this instantly to whatever precision you set.
How do I convert petajoule back to gigajoule?
Use the reverse factor: 1 petajoule equals 1,000,000 gigajoules. You can also use the swap control in the converter above to flip the direction instantly.
What is a gigajoule?
Gigajoule (GJ) is a unit of engineering.
What is a petajoule?
Petajoule (PJ) is a unit of engineering.
Is the gigajoule to petajoule conversion exact?
Yes. Both gigajoule and petajoule 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.