GJ to kWh Conversion Calculator

Convert GJ to kWh (1 GJ = 277.78 kWh) or kWh to GJ, with MJ, MWh and GWh options, plus optional average power and energy cost.

Assumptions Assumptions

Pure energy-to-energy conversion using SI definitions; no fuel heat-content factors are applied.
Exact identity used: 1 kWh = 3.6 MJ (1 W = 1 J/s and 1 h = 3600 s).
Calculator outputs use up to four decimal places, with scientific notation for very small or large values; table values are rounded to three decimals.
Units supported on the GJ side: J, kJ, MJ, GJ, TJ; on the kWh side: Wh, kWh, MWh, GWh.

When to Use This Calculator

Converting utility or project energy totals between GJ and kWh (e.g., billing, reporting, compliance).
Standardizing datasets that mix Wh/kWh/MWh/GWh with J/kJ/MJ/GJ/TJ.
Cross-checking energy budgets and equipment specs without separate conversion charts.

Input Definitions

GJ side — J (10⁰), kJ (10³), MJ (10⁶), GJ (10⁹), TJ (10¹²).
kWh side — Wh, kWh, MWh, GWh (1 Wh = 3600 J).
Conversions — kWh = GJ × 277.7778; GJ = kWh × 0.0036; equivalently, kWh = J ÷ 3.6×10⁶ and GJ = J ÷ 10⁹.

GJ to kWh Formula

The following formula converts gigajoules to kilowatt-hours, followed by a few exact identities you can use for other unit steps.

kWh = GJ / 0.0036

GJ to kWh
GJ	kWh
0.01	2.778
0.05	13.889
0.10	27.778
0.25	69.444
0.50	138.889
0.75	208.333
1	277.778
1.25	347.222
1.50	416.667
1.75	486.111
2	555.556
2.5	694.444
3	833.333
4	1111.111
5	1388.889
7.5	2083.333
10	2777.778
15	4166.667
20	5555.556
50	13888.889
* Approximately 1 GJ = 277.7778 kWh. The exact identity is 1 kWh = 3.6 MJ.

How do you convert GJ to kWh? Divide gigajoules by 0.0036, since 1 kWh = 3.6 MJ and 1 GJ = 1000 MJ. Multiplying by 277.7778 is an approximation.

How do you convert kWh to GJ? Multiply kWh by the exact factor 0.0036.

Convert 3.6 GJ to kWh.

Use the exact formula: kWh = GJ ÷ 0.0036.

kWh = 3.6 ÷ 0.0036 = 1000 kWh