Convert joule to kilojoule
1 J = 0.001 kJ
1 J = 0.001 kJ
1 J in every energy unit
| electron volt | 6.2415e+18 eV |
| hartree | 2.2937e+17 Eh |
| kiloelectron volt | 6.2415e+15 keV |
| megaelectron volt | 6,241,500,000,000 MeV |
| gigaelectron volt | 6,241,500,000 GeV |
| nanojoule | 1,000,000,000 nJ |
| erg | 10,000,000 erg |
| teraelectron volt | 6,241,500 TeV |
| microjoule | 1,000,000 µJ |
| millijoule | 1,000 mJ |
| inch-pound | 8.8507 in·lb |
| joule | 1 J |
| foot-pound | 0.73756 ft⋅lb |
| calorie | 0.23901 cal |
| calorie (International Table) | 0.23885 cal IT |
| kilojoule | 0.001 kJ |
| BTU (thermochemical) | 0.00094845 BTU th |
| British thermal unit | 0.00094782 BTU |
| watt-hour | 0.00027778 Wh |
| kilocalorie | 0.00023901 kcal |
| megajoule | 0.000001 MJ |
| horsepower-hour | 3.7251e-07 hp·h |
| kilowatt-hour | 2.7778e-07 kWh |
| therm | 9.4782e-09 therm |
| gigajoule | 1.0000e-09 GJ |
| million BTU | 9.4782e-10 MMBTU |
| megawatt-hour | 2.7778e-10 MWh |
| ton of TNT | 2.3901e-10 t TNT |
| tonne of oil equivalent | 2.3885e-11 toe |
| terajoule | 1.0000e-12 TJ |
| gigawatt-hour | 2.7778e-13 GWh |
| kiloton of TNT | 2.3901e-13 kt TNT |
| petajoule | 1.0000e-15 PJ |
| terawatt-hour | 2.7778e-16 TWh |
| megaton of TNT | 2.3901e-16 Mt TNT |
| quad | 9.4782e-19 quad |
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 |