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Gigajoules to Joules Converter

Convert gigajoules (GJ) to joules (watt-seconds) (J), 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
1,000,000,000 J
kilojoules
1,000,000 kJ
megajoules
1,000 MJ
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 = 1,000,000,000 J

Show the working
  1. 1 GJ = 1000000000 J
  2. 1 × 1000000000 = 1000000000 J

How to convert gigajoules to joules

1 GJ = 1,000,000,000 J, so multiply by 1,000,000,000 to go from gigajoules to joules (watt-seconds). Going the other way, 1 J = 1 × 10⁻⁹ GJ.

J = GJ × 1,000,000,000
GJ = J × 1

Worked example:

1 GJ = 1000000000 J
5 × 1000000000 = 5000000000 J

Gigajoules to joules table

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

About the units

Joules (J)
Joules (watt-seconds), a metric unit. Definition: BIPM SI Brochure, 9th edition (SI units, prefixes and units accepted for use with the SI).

Formula version 0.1.0Reviewed