Convert kilojoule to joule
1 kJ = 1,000 J
1 kJ = 1,000 J
1 kJ in every energy unit
| joule | 1,000 J |
| kilojoule | 1 kJ |
| megajoule | 0.001 MJ |
| calorie | 239 cal |
| kilocalorie | 0.239 kcal |
| watt-hour | 0.278 Wh |
| kilowatt-hour | 0.000278 kWh |
| British thermal unit | 0.948 BTU |
| foot-pound | 738 ft⋅lb |
| electron volt | 6.24e+21 eV |
| kiloelectron volt | 6.24e+18 keV |
| megaelectron volt | 6.24e+15 MeV |
How the conversion works
Multiply by 1,000 to go from kilojoule to joule, or divide by it to go back. Every conversion on this site routes through the SI value (J) rather than a table of pairwise factors, so a round-trip returns exactly what you started with.
Going the other way? joule to kilojoule — 1 J = 0.001 kJ.
kilojoule to joule — common values
| 1 kJ | 1,000 J |
| 2 kJ | 2,000 J |
| 3 kJ | 3,000 J |
| 5 kJ | 5,000 J |
| 10 kJ | 10,000 J |
| 15 kJ | 15,000 J |
| 20 kJ | 20,000 J |
| 25 kJ | 25,000 J |
| 50 kJ | 50,000 J |
| 75 kJ | 75,000 J |
| 100 kJ | 100,000 J |
| 250 kJ | 250,000 J |
| 500 kJ | 500,000 J |
| 1000 kJ | 1,000,000 J |