Convert joule to kilojoule
1 J = 0.001 kJ
1 J = 0.001 kJ
1 J in every energy unit
| joule | 1 J |
| kilojoule | 0.001 kJ |
| megajoule | 0.000001 MJ |
| calorie | 0.239 cal |
| kilocalorie | 0.000239 kcal |
| watt-hour | 0.000278 Wh |
| kilowatt-hour | 2.78e-07 kWh |
| British thermal unit | 0.000948 BTU |
| foot-pound | 0.738 ft⋅lb |
| electron volt | 6.24e+18 eV |
| kiloelectron volt | 6.24e+15 keV |
| megaelectron volt | 6,240,000,000,000 MeV |
How the conversion works
Multiply by 0.001 to go from joule to kilojoule, 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? kilojoule to joule — 1 kJ = 1,000 J.
joule to kilojoule — common values
| 1 J | 0.001 kJ |
| 2 J | 0.002 kJ |
| 3 J | 0.003 kJ |
| 5 J | 0.005 kJ |
| 10 J | 0.01 kJ |
| 15 J | 0.015 kJ |
| 20 J | 0.02 kJ |
| 25 J | 0.025 kJ |
| 50 J | 0.05 kJ |
| 75 J | 0.075 kJ |
| 100 J | 0.1 kJ |
| 250 J | 0.25 kJ |
| 500 J | 0.5 kJ |
| 1000 J | 1 kJ |