Megajoule to Gigajoule Converter
Energy · unit-converter
Convert Megajoule to Gigajoule 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: Megajoule (mj)
To: Gigajoule (gj)
About Megajoule
One megajoule is 1,000,000 J. It is common in fuel-content and engineering thermal calculations.
About Gigajoule
One gigajoule is 1,000,000,000 J. Utility-scale and fuel-system reporting commonly use GJ.
How to convert megajoules to gigajoules
1 megajoule is equal to 0.001 gigajoule when both are expressed in joule-equivalents:
1 mj = (1,000,000 J ÷ 1,000,000,000 J) gj = 0.001 gj
Each megajoule is defined as 1,000,000 J and each gigajoule as 1,000,000,000 J in this tool, so one mj equals 1,000,000 ÷ 1,000,000,000 gj = 0.001 gj.
Let d(mj) be the numeric amount in Megajoule (mj), and d(gj) the amount in Gigajoule (gj). Then:
d(gj) = d(mj) × (1,000,000 / 1,000,000,000)
Equivalently, divide by how many mj fit into one gj (joules per gj divided by joules per mj):
d(gj) = d(mj) ÷ 1000
Or: gigajoule = megajoule ÷ 1000
Examples
Example #1: Convert 1 mj to gigajoule
1 mj = 1 mj × (1,000,000/1,000,000,000) gj = 0.001 gj
1 mj = 1 mj ÷ 1000 = 0.001 gj
Example #2: Convert 10 mj to gigajoule
10 mj = 10 mj × (1,000,000/1,000,000,000) gj = 0.01 gj
10 mj = 10 mj ÷ 1000 = 0.01 gj
Summary
To convert Megajoule to Gigajoule, multiply the value in mj by the ratio of joules per mj divided by joules per gj. Equivalently: value_gj = value_mj × (1000000 / 1000000000). Numerically, 1 mj equals 0.001 gj.
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 Megajoule to Gigajoule is 1.000000e-3 (1 mj = 0.001 gj).
Conversion tables
| Megajoule (mj) | Gigajoule (gj) |
|---|---|
| 0.1 | 0.0001 |
| 1 | 0.001 |
| 2 | 0.002 |
| 3 | 0.003 |
| 4 | 0.004 |
| 5 | 0.005 |
| 6 | 0.006 |
| 7 | 0.007 |
| 8 | 0.008 |
| 9 | 0.009 |
| Megajoule (mj) | Gigajoule (gj) |
|---|---|
| 10 | 0.01 |
| 20 | 0.02 |
| 30 | 0.03 |
| 40 | 0.04 |
| 50 | 0.05 |
| 60 | 0.06 |
| 70 | 0.07 |
| 80 | 0.08 |
| 90 | 0.09 |
| 100 | 0.1 |