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Megajoules to Gigajoules Converter

Convert megajoules (MJ) to gigajoules (GJ), with the formula, a conversion table and exact factors.

Change the values and press Calculate to work out your own figures.

Enter an amount of energy, choose its unit and the unit you want. The answer is exact until it is shown, and the same value appears in every other unit.

A number, fraction (3/8), mixed number (1 1/2), scientific notation (2.5e6) or a simple sum such as 2*3.
The unit you want the answer in. Swap exchanges the two units.
Result
0.001 GJ
joules (watt-seconds)
1,000,000 J
kilojoules
1,000 kJ
calories (thermochemical)
239,005.736138 cal
kilocalories (food Calories)
239.005736138 kcal
megacalories
0.239005736138 Mcal
watt-hours
277.777777778 Wh
kilowatt-hours
0.277777777778 kWh
megawatt-hours
0.000277777777778 MWh
British thermal units (IT)
947.817120313 Btu
million Btu
0.000947817120313 MMBtu
therms (100,000 Btu)
0.00947817120313 thm
quads (10¹⁵ Btu)
9.47817120313 × 10⁻¹³ quad
electronvolts
6.24150907446 × 10²⁴ eV
kiloelectronvolts
6.24150907446 × 10²¹ keV
megaelectronvolts
6.24150907446 × 10¹⁸ MeV

1 MJ = 0.001 GJ

Show the working
  1. 1 MJ = 0.001 GJ
  2. 1 × 0.001 = 0.001 GJ

How to convert megajoules to gigajoules

1 MJ = 0.001 GJ, so multiply by 0.001 to go from megajoules to gigajoules. Going the other way, 1 GJ = 1,000 MJ.

GJ = MJ × 0.001
MJ = GJ × 1,000

Worked example:

1 MJ = 0.001 GJ
5 × 0.001 = 0.005 GJ

Megajoules to gigajoules table

MegajoulesGigajoules
1 MJ0.001 GJ
2 MJ0.002 GJ
3 MJ0.003 GJ
4 MJ0.004 GJ
5 MJ0.005 GJ
6 MJ0.006 GJ
7 MJ0.007 GJ
8 MJ0.008 GJ
9 MJ0.009 GJ
10 MJ0.01 GJ
15 MJ0.015 GJ
20 MJ0.02 GJ
25 MJ0.025 GJ
30 MJ0.03 GJ
40 MJ0.04 GJ
50 MJ0.05 GJ
75 MJ0.075 GJ
100 MJ0.1 GJ
250 MJ0.25 GJ
500 MJ0.5 GJ
1000 MJ1 GJ

About the units

Formula version 0.1.0Reviewed