How to convert energy in kilojoules (kJ) to joules (J).
How to convert kJ to joules
One kilojoules is equal to 1000 joules:
1kJ = 1000J
The energy E in joules (J) is equal to the energy in kilojoules (kJ) times 1000:
E(J) = E(kJ) × 1000
Example
Convert 4kJ to joules.
The energy E in joules (J) is equal to 4 kilojoules times 1000:
E(J) = 4kJ × 1000 = 4000J