Kilojoule is 1000 joule units.
Kilojoules to Gigajoules Converter — kJ to GJ
Convert Kilojoule (kJ) to Gigajoule (GJ) using the exact conversion factor (1 kilojoule = 0.000001 gigajoule). See the formula, worked examples, and conversion table.
Kilojoules 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 1000 / 1e+9.
Energy units are compatible.
Reserved above the conversion cards and below the converter.
About Converting Kilojoules to Gigajoules
Kilojoule 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: Kilojoule is 1000 joule units, and gigajoule is 1000000000 joule units.
Formula
gigajoules = kilojoules × 0.000001
This factor comes from each unit's defined relationship to the category's base unit: 1 kilojoule equals 1000 base units, and 1 gigajoule equals 1000000000 base units, so dividing one by the other gives the direct kilojoule-to-gigajoule factor of 0.000001.
Simple example
1 kJ × 0.000001 = 0.000001 GJ
1 kilojoule = 0.000001 gigajoules.
Real-world example
100 kJ × 0.000001 = 0.0001 GJ
100 kilojoules = 0.0001 gigajoules.
Conversion table
| Kilojoule (kJ) | Gigajoule (GJ) |
|---|---|
| 1 kJ | 0.000001 GJ |
| 10 kJ | 0.00001 GJ |
| 50 kJ | 0.00005 GJ |
| 100 kJ | 0.0001 GJ |
| 500 kJ | 0.0005 GJ |
| 1,000 kJ | 0.001 GJ |
Reverse conversion: Gigajoule to Kilojoule
0.000001 GJ × 1000000 = 1 kJ
0.000001 gigajoules = 1 kilojoule.
kilojoules = gigajoules × 1000000
For a page dedicated to this direction, see Gigajoule to Kilojoule.
Understanding the Kilojoule (kJ)
Kilojoule is 1000 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 kilojoule?
1 kilojoule equals 0.000001 gigajoules, using the exact defined conversion factor rather than an estimate.
How do I convert kilojoule to gigajoule?
Multiply the kilojoule value by 0.000001. The converter above does this instantly to whatever precision you set.
How do I convert gigajoule back to kilojoule?
Use the reverse factor: 1 gigajoule equals 1,000,000 kilojoules. You can also use the swap control in the converter above to flip the direction instantly.
What is a kilojoule?
Kilojoule (kJ) is a unit of engineering.
What is a gigajoule?
Gigajoule (GJ) is a unit of engineering.
Is the kilojoule to gigajoule conversion exact?
Yes. Both kilojoule and gigajoule 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.