Enter GJ or kWh into the calculator to convert to the other value.

GJ to Kwh Conversion Calculator

Enter exactly 1 value to calculate the other

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 are rounded to 6 decimals; table values are rounded to 3 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.

\mathrm{kWh} = 277.7778\,\mathrm{GJ}
  • 1 GJ = 109 J
  • 1 kWh = 3.6 × 106 J
  • 1 MWh = 3.6 GJ
  • 1 Wh = 3600 J

GJ to Kwh Conversion Table

GJ to kWh
GJ kWh
0.012.778
0.0513.889
0.1027.778
0.2569.444
0.50138.889
0.75208.333
1277.778
1.25347.222
1.50416.667
1.75486.111
2555.556
2.5694.444
3833.333
41111.111
51388.889
7.52083.333
102777.778
154166.667
205555.556
5013888.889
* Exact: 1 GJ = 277.7778 kWh (1 kWh = 3.6 MJ).

How do you convert GJ to kWh? Multiply gigajoules by 277.7778, since 1 kWh = 3.6 MJ and 1 GJ = 1000 MJ.

How do you convert kWh to GJ? Multiply kWh by 0.0036 or divide by 277.7778.

Example Problem

Convert 3.6 GJ to kWh.

Use the formula: kWh = GJ × 277.7778.

kWh = 3.6 × 277.7778 = 1000 kWh