Gigajoule is 1000000000 joule units.
Gigajoules to Hectojoules Converter — GJ to hJ
Convert Gigajoule (GJ) to Hectojoule (hJ) using the exact conversion factor (1 gigajoule = 10,000,000 hectojoule). See the formula, worked examples, and conversion table.
Gigajoules to Hectojoules converter
Converter
Energy Converter
Convert joules, calories, kilowatt-hours, BTU, electronvolts, therms, and mechanical work units.
Context values
Some unit families need one extra value for a physically accurate result.
Hectojoule is 100 joule units.
Result = input x 1e+9 / 100.
Energy uses the joule as the base unit.
Reserved above the conversion cards and below the converter.
About Converting Gigajoules to Hectojoules
Gigajoule and Hectojoule both measure energy, and the conversion is especially useful for comparing nutrition labels (kilocalories) against scientific energy figures (joules). Specifically: Gigajoule is 1000000000 joule units, and hectojoule is 100 joule units.
Formula
hectojoules = gigajoules × 10000000
This factor comes from each unit's defined relationship to the category's base unit: 1 gigajoule equals 1000000000 base units, and 1 hectojoule equals 100 base units, so dividing one by the other gives the direct gigajoule-to-hectojoule factor of 10000000.
Simple example
1 GJ × 10000000 = 10,000,000 hJ
1 gigajoule = 10,000,000 hectojoules.
Real-world example
100 GJ × 10000000 = 1,000,000,000 hJ
100 gigajoules = 1,000,000,000 hectojoules.
Conversion table
| Gigajoule (GJ) | Hectojoule (hJ) |
|---|---|
| 1 GJ | 10,000,000 hJ |
| 10 GJ | 100,000,000 hJ |
| 100 GJ | 1,000,000,000 hJ |
| 500 GJ | 5,000,000,000 hJ |
| 1,000 GJ | 10,000,000,000 hJ |
| 2,000 GJ | 20,000,000,000 hJ |
Reverse conversion: Hectojoule to Gigajoule
1 hJ × 1e-7 = 1e-7 GJ
1 hectojoule = 1e-7 gigajoules.
gigajoules = hectojoules × 1e-7
For a page dedicated to this direction, see Hectojoule to Gigajoule.
Understanding the Gigajoule (GJ)
Gigajoule is 1000000000 joule units.
Understanding the Hectojoule (hJ)
Hectojoule is 100 joule units.
Reserved between the cards and the FAQ so the page stays balanced.
Frequently asked questions
How many hectojoules are in 1 gigajoule?
1 gigajoule equals 10,000,000 hectojoules, using the exact defined conversion factor rather than an estimate.
How do I convert gigajoule to hectojoule?
Multiply the gigajoule value by 10000000. The converter above does this instantly to whatever precision you set.
How do I convert hectojoule back to gigajoule?
Use the reverse factor: 1 hectojoule equals 1e-7 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 energy.
What is a hectojoule?
Hectojoule (hJ) is a unit of energy.
Is the gigajoule to hectojoule conversion exact?
Yes. Both gigajoule and hectojoule are defined by fixed standards rather than physical artifacts, so the factor of 10000000 used above is exact to as many digits as you choose to display.