Gigajoule is 1000000000 joule units.
Gigajoules to Decijoules Converter — GJ to dJ
Convert Gigajoule (GJ) to Decijoule (dJ) using the exact conversion factor (1 gigajoule = 10,000,000,000 decijoule). See the formula, worked examples, and conversion table.
Gigajoules to Decijoules 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.
Decijoule is 0.1 joule units.
Result = input x 1e+9 / 0.1.
Energy units are compatible.
Reserved above the conversion cards and below the converter.
About Converting Gigajoules to Decijoules
Gigajoule and Decijoule 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 decijoule is 0.1 joule units.
Formula
decijoules = gigajoules × 10000000000
This factor comes from each unit's defined relationship to the category's base unit: 1 gigajoule equals 1000000000 base units, and 1 decijoule equals 0.1 base units, so dividing one by the other gives the direct gigajoule-to-decijoule factor of 10000000000.
Simple example
1 GJ × 10000000000 = 10,000,000,000 dJ
1 gigajoule = 10,000,000,000 decijoules.
Real-world example
100 GJ × 10000000000 = 1e+12 dJ
100 gigajoules = 1e+12 decijoules.
Conversion table
| Gigajoule (GJ) | Decijoule (dJ) |
|---|---|
| 1 GJ | 10,000,000,000 dJ |
| 10 GJ | 100,000,000,000 dJ |
| 50 GJ | 500,000,000,000 dJ |
| 100 GJ | 1e+12 dJ |
| 500 GJ | 5e+12 dJ |
| 1,000 GJ | 1e+13 dJ |
Reverse conversion: Decijoule to Gigajoule
1 dJ × 1e-10 = 1e-10 GJ
1 decijoule = 1e-10 gigajoules.
gigajoules = decijoules × 1e-10
For a page dedicated to this direction, see Decijoule to Gigajoule.
Understanding the Gigajoule (GJ)
Gigajoule is 1000000000 joule units.
Understanding the Decijoule (dJ)
Decijoule is 0.1 joule units.
Reserved between the cards and the FAQ so the page stays balanced.
Frequently asked questions
How many decijoules are in 1 gigajoule?
1 gigajoule equals 10,000,000,000 decijoules, using the exact defined conversion factor rather than an estimate.
How do I convert gigajoule to decijoule?
Multiply the gigajoule value by 10000000000. The converter above does this instantly to whatever precision you set.
How do I convert decijoule back to gigajoule?
Use the reverse factor: 1 decijoule equals 1e-10 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 decijoule?
Decijoule (dJ) is a unit of engineering.
Is the gigajoule to decijoule conversion exact?
Yes. Both gigajoule and decijoule are defined by fixed standards rather than physical artifacts, so the factor of 10000000000 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.