Convert 1 Gigajoule to Millijoule (1 GJ to mJ)
Looking to convert 1 gigajoule (GJ) to millijoule (mJ)? This page provides the accurate result and a detailed explanation of how the conversion is done. Use this information to understand the relationship between Gigajoule and Millijoule and how to calculate conversions manually or using online tools.

Looking to convert 1 gigajoule (GJ) to millijoule (mJ)? This page provides the accurate result and a detailed explanation of how the conversion is done. Use this information to understand the relationship between Gigajoule and Millijoule and how to calculate conversions manually or using online tools.
What is Gigajoule to Millijoule Conversion?
Gigajoule (GJ) and millijoule (mJ) are both units used to measure energy, but they serve different purposes depending on the scale of the measurement. If you ever need to convert gigajoule to millijoule, knowing the exact conversion formula is essential.
GJ to mj Conversion Formula:
One Gigajoule is equal to 1e+12 Millijoule.
Formula: 1 GJ = 1e+12 mJ
By using this conversion factor, you can easily convert any energy from gigajoule to millijoule with precision.
Convert 1 Gigajoule to Millijoule
To convert 1 gigajoule to millijoule, multiply the value by 1e+12 since:
1 gigajoule = 1e+12 millijoule
So:
1 × 1e+12 = 1e+12
Result: 1 gigajoule = 1e+12 millijoule
Reverse Conversion
Need the reverse result? You can also convert millijoule back to gigajoule by dividing 1e+12:
1e+12 millijoule ÷ 1e+12 = 1 gigajoule
For more, visit: Millijoule to Gigajoule
Explore Related Conversion Tool
This page focuses specifically on converting 1 Gigajoule to Millijoule. If you're looking to convert a different value, you can use our general conversion tool:
Frequently Asked Questions
What is 1 gigajoule in millijoule?
1 gigajoule is equal to 1e+12 millijoule.
How do I convert gigajoule to millijoule?
Multiply the value in gigajoule by 1e+12 to get the equivalent in millijoule.