Gigajoule is 1000000000 joule units.
Gigajoules to Decajoules Converter — GJ to daJ
Convert Gigajoule (GJ) to Decajoule (daJ) using the exact conversion factor (1 gigajoule = 100,000,000 decajoule). See the formula, worked examples, and conversion table.
Gigajoules to Decajoules 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.
Decajoule is 10 joule units.
Result = input x 1e+9 / 10.
Energy units are compatible.
Reserved above the conversion cards and below the converter.
About Converting Gigajoules to Decajoules
Gigajoule and Decajoule 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 decajoule is 10 joule units.
Formula
decajoules = gigajoules × 100000000
This factor comes from each unit's defined relationship to the category's base unit: 1 gigajoule equals 1000000000 base units, and 1 decajoule equals 10 base units, so dividing one by the other gives the direct gigajoule-to-decajoule factor of 100000000.
Simple example
1 GJ × 100000000 = 100,000,000 daJ
1 gigajoule = 100,000,000 decajoules.
Real-world example
100 GJ × 100000000 = 10,000,000,000 daJ
100 gigajoules = 10,000,000,000 decajoules.
Conversion table
| Gigajoule (GJ) | Decajoule (daJ) |
|---|---|
| 1 GJ | 100,000,000 daJ |
| 10 GJ | 1,000,000,000 daJ |
| 50 GJ | 5,000,000,000 daJ |
| 100 GJ | 10,000,000,000 daJ |
| 500 GJ | 50,000,000,000 daJ |
| 1,000 GJ | 100,000,000,000 daJ |
Reverse conversion: Decajoule to Gigajoule
1 daJ × 1e-8 = 1e-8 GJ
1 decajoule = 1e-8 gigajoules.
gigajoules = decajoules × 1e-8
For a page dedicated to this direction, see Decajoule to Gigajoule.
Understanding the Gigajoule (GJ)
Gigajoule is 1000000000 joule units.
Understanding the Decajoule (daJ)
Decajoule is 10 joule units.
Reserved between the cards and the FAQ so the page stays balanced.
Frequently asked questions
How many decajoules are in 1 gigajoule?
1 gigajoule equals 100,000,000 decajoules, using the exact defined conversion factor rather than an estimate.
How do I convert gigajoule to decajoule?
Multiply the gigajoule value by 100000000. The converter above does this instantly to whatever precision you set.
How do I convert decajoule back to gigajoule?
Use the reverse factor: 1 decajoule equals 1e-8 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 decajoule?
Decajoule (daJ) is a unit of engineering.
Is the gigajoule to decajoule conversion exact?
Yes. Both gigajoule and decajoule are defined by fixed standards rather than physical artifacts, so the factor of 100000000 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.