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