Gigajoules to Kilojoules converter

To convert gigajoules to kilojoules, enter the value in the first field. The result in kilojoules is calculated automatically using the exact conversion factor.

1 GJ = 1000000 kJ
1 kJ = 1 × 10^-6 GJ

Formula: kJ = GJ × 1000000
GJ = kJ × 1 × 10^-6

Definitions: 1 GJ = 1000000000 J; 1 kJ = 1000 J

The gigajoule (GJ) is one billion joules. It is used for large energy quantities such as household and industrial gas consumption, district heating and energy budgets, and one gigajoule is about 278 kilowatt-hours.

The kilojoule (kJ) is 1,000 joules. It is used for food energy on nutrition labels in Australia, New Zealand and Europe, often next to kcal, and for reaction energies in chemistry.

See the conversion table with commonly used values, handy for quick reference or study.