Gigajoule to Megajoule Converter
Energy · unit-converter
Convert Gigajoule to Megajoule with fixed input and output units, a step-by-step formula line, and reference tables. Factors are joule-based; food energy uses thermochemical calories. The full Energy Converter also includes MMBtu, toe, thermal kWh, and MeV/GeV.
Calculator
From: Gigajoule (gj)
To: Megajoule (mj)
About Gigajoule
One gigajoule is 1,000,000,000 J. Utility-scale and fuel-system reporting commonly use GJ.
About Megajoule
One megajoule is 1,000,000 J. It is common in fuel-content and engineering thermal calculations.
How to convert gigajoules to megajoules
1 gigajoule is equal to 1000 megajoule when both are expressed in joule-equivalents:
1 gj = (1,000,000,000 J ÷ 1,000,000 J) mj = 1000 mj
Each gigajoule is defined as 1,000,000,000 J and each megajoule as 1,000,000 J in this tool, so one gj equals 1,000,000,000 ÷ 1,000,000 mj = 1000 mj.
Let d(gj) be the numeric amount in Gigajoule (gj), and d(mj) the amount in Megajoule (mj). Then:
d(mj) = d(gj) × (1,000,000,000 / 1,000,000)
Equivalently, divide by how many gj fit into one mj (joules per mj divided by joules per gj):
d(mj) = d(gj) ÷ 0.001
Or: megajoule = gigajoule ÷ 0.001
Examples
Example #1: Convert 1 gj to megajoule
1 gj = 1 gj × (1,000,000,000/1,000,000) mj = 1000 mj
1 gj = 1 gj ÷ 0.001 = 1000 mj
Example #2: Convert 10 gj to megajoule
10 gj = 10 gj × (1,000,000,000/1,000,000) mj = 10000 mj
10 gj = 10 gj ÷ 0.001 = 10000 mj
Summary
To convert Gigajoule to Megajoule, multiply the value in gj by the ratio of joules per gj divided by joules per mj. Equivalently: value_mj = value_gj × (1000000000 / 1000000). Numerically, 1 gj equals 1000 mj.
Relationship context
Both units are SI energy (joules). Conversions use fixed joule factors, so results stay consistent with the definitions in this converter. The factor from Gigajoule to Megajoule is 1.000000e+3 (1 gj = 1000 mj).
Conversion tables
| Gigajoule (gj) | Megajoule (mj) |
|---|---|
| 0.1 | 100 |
| 1 | 1,000 |
| 2 | 2,000 |
| 3 | 3,000 |
| 4 | 4,000 |
| 5 | 5,000 |
| 6 | 6,000 |
| 7 | 7,000 |
| 8 | 8,000 |
| 9 | 9,000 |
| Gigajoule (gj) | Megajoule (mj) |
|---|---|
| 10 | 10,000 |
| 20 | 20,000 |
| 30 | 30,000 |
| 40 | 40,000 |
| 50 | 50,000 |
| 60 | 60,000 |
| 70 | 70,000 |
| 80 | 80,000 |
| 90 | 90,000 |
| 100 | 100,000 |