Convert Gigajoule to Megajoule Online

About Gigajoule to Megajoule Conversion

This converter converts Gigajoule (GJ) to Megajoule (MJ). One Gigajoule (GJ) equals 1000 Megajoule (MJ).

Formula:

1 Gigajoule (GJ) = 1000 Megajoule (MJ)

Example:

1 GJ = 1000 MJ
2 GJ = 2000 MJ

Gigajoule (GJ) to Megajoule (MJ) Conversion

Gigajoule to Megajoule conversion explained with exact factors, step-by-step examples, and situations where this conversion is commonly used.

Conversion Formula

Megajoule = Gigajoule × 1000

To convert Gigajoule (GJ) to Megajoule (MJ), multiply the value by 1000. This factor is obtained by comparing their exact meter definitions.

Worked Example

Convert 1 GJ to MJ.

  • Step 1: Write the formula: MJ = GJ × 1000
  • Step 2: Substitute: 1 × 1000
  • Step 3: Result: 1000 MJ
So, 1 GJ = 1000 MJ.

About the Units

Gigajoule (GJ)

One Gigajoule (GJ) equals 1000 Megajoule (MJ)

Used for extremely large distances such as astronomical or planetary scales.

Megajoule (MJ)

One Megajoule (MJ) equals 0.001 Gigajoule (GJ)

Used for extremely large distances such as astronomical or planetary scales.

Where This Conversion Is Used

  • Converting values from Gigajoule to Megajoule for engineering or scientific workflows.
  • Used when normalizing mixed-unit datasets requiring consistent Megajoule representation.
  • Applied when comparing different measurement systems across tools and documents.
  • Essential in astronomy, orbital mechanics, and large-scale simulations.

Frequently Asked Questions

How many Megajoule (MJ) are in 1 Gigajoule (GJ)?

1 GJ = 1000 MJ.

What is the formula for converting Gigajoule (GJ) to Megajoule (MJ)?

Multiply the GJ value by 1000.

Can I reverse the conversion?

Yes. 1 MJ = 0.001 GJ.

Conclusion

By applying the conversion factor shown above, you can reliably convert Gigajoule (GJ) to Megajoule (MJ) for use in scientific analysis, engineering calculations, academic work, or daily measurements.

Quick Links for Unit Converters

Convert Gigajoule to Other Units

Gigajoule to Joule

1 GJ = 1000000000 J

1 Gigajoule (GJ) = 1000000000 Joules (J)

1 GJ equals 1000000000 Js.

Gigajoule to Kilojoule

1 GJ = 1000000 kJ

1 Gigajoule (GJ) = 1000000 Kilojoules (kJ)

1 GJ equals 1000000 kJs.

Gigajoule to Megajoule

1 GJ = 1000 MJ

1 Gigajoule (GJ) = 1000 Megajoules (MJ)

1 GJ equals 1000 MJs.

Gigajoule to Watt-hour

1 GJ = 277777.77777777775 Wh

1 Gigajoule (GJ) = 277777.77777777775 Watt-hours (Wh)

1 GJ equals 277777.77777777775 Whs.

Gigajoule to Kilowatt-hour

1 GJ = 277.77777777777777 kWh

1 Gigajoule (GJ) = 277.77777777777777 Kilowatt-hours (kWh)

1 GJ equals 277.77777777777777 kWhs.

Gigajoule to Megawatt-hour

1 GJ = 0.2777777777777778 MWh

1 Gigajoule (GJ) = 0.2777777777777778 Megawatt-hour (MWh)

1 GJ equals 0.2777777777777778 MWh.

Gigajoule to Erg

1 GJ = 10000000000000000 erg

1 Gigajoule (GJ) = 10000000000000000 Ergs

1 GJ equals 10000000000000000 ergs.

Gigajoule to Calorie

1 GJ = 239005736.1376673 cal

1 Gigajoule (GJ) = 239005736.1376673 Calories (cal)

1 GJ equals 239005736.1376673 cals.

Gigajoule to Kilocalorie

1 GJ = 239005.7361376673 kcal

1 Gigajoule (GJ) = 239005.7361376673 Kilocalories (kcal)

1 GJ equals 239005.7361376673 kcals.

Gigajoule to British Thermal Unit

1 GJ = 947813.3944988911 BTU

1 Gigajoule (GJ) = 947813.3944988911 British Thermal Units (BTU)

1 GJ equals 947813.3944988911 BTUs.

Gigajoule to Foot-pound force

1 GJ = 737562149.4575465 ft_lbf

1 Gigajoule (GJ) = 737562149.4575465 Foot-pound forces (ft⋅lbf)

1 GJ equals 737562149.4575465 ft_lbves.

Gigajoule to Horsepower-hour

1 GJ = 372.506488131757 hp_h

1 Gigajoule (GJ) = 372.506488131757 Horsepower-hours (hp⋅h)

1 GJ equals 372.506488131757 hp_hs.

Gigajoule to Therm

1 GJ = 9.47813394498891 therm_us

1 Gigajoule (GJ) = 9.47813394498891 Therms (US)

1 GJ equals 9.47813394498891 therm_uses.

Gigajoule to Electronvolt

1 GJ = 6.241509074460763e+27 eV

1 Gigajoule (GJ) = 6.241509074460763e+27 Electronvolts (eV)

1 GJ equals 6.241509074460763e+27 eVs.

Gigajoule to Kiloelectronvolt

1 GJ = 6.241509074460763e+24 keV

1 Gigajoule (GJ) = 6.241509074460763e+24 Kiloelectronvolts (keV)

1 GJ equals 6.241509074460763e+24 keVs.

Gigajoule to Megaelectronvolt

1 GJ = 6.241509074460763e+21 MeV

1 Gigajoule (GJ) = 6.241509074460763e+21 Megaelectronvolts (MeV)

1 GJ equals 6.241509074460763e+21 MeVs.

Gigajoule to Gigaelectronvolt

1 GJ = 6241509074460762000 GeV

1 Gigajoule (GJ) = 6241509074460762000 Gigaelectronvolts (GeV)

1 GJ equals 6241509074460762000 GeVs.

Gigajoule to Tonne of Oil Equivalent

1 GJ = 0.023884589662749593 toe

1 Gigajoule (GJ) = 0.023884589662749593 Tonne of Oil Equivalent (toe)

1 GJ equals 0.023884589662749593 toe.

Gigajoule to Tonne of Coal Equivalent

1 GJ = 0.034120842375356564 tce

1 Gigajoule (GJ) = 0.034120842375356564 Tonne of Coal Equivalent (tce)

1 GJ equals 0.034120842375356564 tce.

Gigajoule to Hartree

1 GJ = 2.293712278396325e+26 hartree

1 Gigajoule (GJ) = 2.293712278396325e+26 Hartrees

1 GJ equals 2.293712278396325e+26 hartrees.

Convert Megajoule to Other Units

Megajoule to Joule

1 MJ = 1000000 J

1 Megajoule (MJ) = 1000000 Joules (J)

1 MJ equals 1000000 Js.

Megajoule to Kilojoule

1 MJ = 1000 kJ

1 Megajoule (MJ) = 1000 Kilojoules (kJ)

1 MJ equals 1000 kJs.

Megajoule to Gigajoule

1 MJ = 0.001 GJ

1 Megajoule (MJ) = 0.001 Gigajoule (GJ)

1 MJ equals 0.001 GJ.

Megajoule to Watt-hour

1 MJ = 277.77777777777777 Wh

1 Megajoule (MJ) = 277.77777777777777 Watt-hours (Wh)

1 MJ equals 277.77777777777777 Whs.

Megajoule to Kilowatt-hour

1 MJ = 0.2777777777777778 kWh

1 Megajoule (MJ) = 0.2777777777777778 Kilowatt-hour (kWh)

1 MJ equals 0.2777777777777778 kWh.

Megajoule to Megawatt-hour

1 MJ = 0.0002777777777777778 MWh

1 Megajoule (MJ) = 0.0002777777777777778 Megawatt-hour (MWh)

1 MJ equals 0.0002777777777777778 MWh.

Megajoule to Erg

1 MJ = 10000000000000 erg

1 Megajoule (MJ) = 10000000000000 Ergs

1 MJ equals 10000000000000 ergs.

Megajoule to Calorie

1 MJ = 239005.7361376673 cal

1 Megajoule (MJ) = 239005.7361376673 Calories (cal)

1 MJ equals 239005.7361376673 cals.

Megajoule to Kilocalorie

1 MJ = 239.0057361376673 kcal

1 Megajoule (MJ) = 239.0057361376673 Kilocalories (kcal)

1 MJ equals 239.0057361376673 kcals.

Megajoule to British Thermal Unit

1 MJ = 947.8133944988911 BTU

1 Megajoule (MJ) = 947.8133944988911 British Thermal Units (BTU)

1 MJ equals 947.8133944988911 BTUs.

Megajoule to Foot-pound force

1 MJ = 737562.1494575464 ft_lbf

1 Megajoule (MJ) = 737562.1494575464 Foot-pound forces (ft⋅lbf)

1 MJ equals 737562.1494575464 ft_lbves.

Megajoule to Horsepower-hour

1 MJ = 0.372506488131757 hp_h

1 Megajoule (MJ) = 0.372506488131757 Horsepower-hour (hp⋅h)

1 MJ equals 0.372506488131757 hp_h.

Megajoule to Therm

1 MJ = 0.00947813394498891 therm_us

1 Megajoule (MJ) = 0.00947813394498891 Therm (US)

1 MJ equals 0.00947813394498891 therm_us.

Megajoule to Electronvolt

1 MJ = 6.241509074460763e+24 eV

1 Megajoule (MJ) = 6.241509074460763e+24 Electronvolts (eV)

1 MJ equals 6.241509074460763e+24 eVs.

Megajoule to Kiloelectronvolt

1 MJ = 6.241509074460763e+21 keV

1 Megajoule (MJ) = 6.241509074460763e+21 Kiloelectronvolts (keV)

1 MJ equals 6.241509074460763e+21 keVs.

Megajoule to Megaelectronvolt

1 MJ = 6241509074460762000 MeV

1 Megajoule (MJ) = 6241509074460762000 Megaelectronvolts (MeV)

1 MJ equals 6241509074460762000 MeVs.

Megajoule to Gigaelectronvolt

1 MJ = 6241509074460762 GeV

1 Megajoule (MJ) = 6241509074460762 Gigaelectronvolts (GeV)

1 MJ equals 6241509074460762 GeVs.

Megajoule to Tonne of Oil Equivalent

1 MJ = 0.000023884589662749594 toe

1 Megajoule (MJ) = 0.000023884589662749594 Tonne of Oil Equivalent (toe)

1 MJ equals 0.000023884589662749594 toe.

Megajoule to Tonne of Coal Equivalent

1 MJ = 0.00003412084237535656 tce

1 Megajoule (MJ) = 0.00003412084237535656 Tonne of Coal Equivalent (tce)

1 MJ equals 0.00003412084237535656 tce.

Megajoule to Hartree

1 MJ = 2.293712278396325e+23 hartree

1 Megajoule (MJ) = 2.293712278396325e+23 Hartrees

1 MJ equals 2.293712278396325e+23 hartrees.