Skip to content
RK Calculator
Menu

Gigajoules to Megajoules Converter

Convert gigajoules (GJ) to megajoules (MJ), 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
1,000 MJ
joules (watt-seconds)
1,000,000,000 J
kilojoules
1,000,000 kJ
calories (thermochemical)
239,005,736.138 cal
kilocalories (food Calories)
239,005.736138 kcal
megacalories
239.005736138 Mcal
watt-hours
277,777.777778 Wh
kilowatt-hours
277.777777778 kWh
megawatt-hours
0.277777777778 MWh
British thermal units (IT)
947,817.120313 Btu
million Btu
0.947817120313 MMBtu
therms (100,000 Btu)
9.47817120313 thm
quads (10¹⁵ Btu)
9.47817120313 × 10⁻¹⁰ quad
electronvolts
6.24150907446 × 10²⁷ eV
kiloelectronvolts
6.24150907446 × 10²⁴ keV
megaelectronvolts
6.24150907446 × 10²¹ MeV

1 GJ = 1,000 MJ

Show the working
  1. 1 GJ = 1000 MJ
  2. 1 × 1000 = 1000 MJ

How to convert gigajoules to megajoules

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

MJ = GJ × 1,000
GJ = MJ × 0.001

Worked example:

1 GJ = 1000 MJ
5 × 1000 = 5000 MJ

Gigajoules to megajoules table

GigajoulesMegajoules
1 GJ1,000 MJ
2 GJ2,000 MJ
3 GJ3,000 MJ
4 GJ4,000 MJ
5 GJ5,000 MJ
6 GJ6,000 MJ
7 GJ7,000 MJ
8 GJ8,000 MJ
9 GJ9,000 MJ
10 GJ10,000 MJ
15 GJ15,000 MJ
20 GJ20,000 MJ
25 GJ25,000 MJ
30 GJ30,000 MJ
40 GJ40,000 MJ
50 GJ50,000 MJ
75 GJ75,000 MJ
100 GJ100,000 MJ
250 GJ250,000 MJ
500 GJ500,000 MJ
1000 GJ1,000,000 MJ

About the units

Formula version 0.1.0Reviewed