Convert kilojoule to joule
1 kJ = 1,000 J
1 kJ = 1,000 J
1 kJ in every energy unit
| electron volt | 6.2415e+21 eV |
| hartree | 2.2937e+20 Eh |
| kiloelectron volt | 6.2415e+18 keV |
| megaelectron volt | 6.2415e+15 MeV |
| gigaelectron volt | 6,241,500,000,000 GeV |
| nanojoule | 1,000,000,000,000 nJ |
| erg | 10,000,000,000 erg |
| teraelectron volt | 6,241,500,000 TeV |
| microjoule | 1,000,000,000 µJ |
| millijoule | 1,000,000 mJ |
| inch-pound | 8,850.7 in·lb |
| joule | 1,000 J |
| foot-pound | 737.56 ft⋅lb |
| calorie | 239.01 cal |
| calorie (International Table) | 238.85 cal IT |
| kilojoule | 1 kJ |
| BTU (thermochemical) | 0.94845 BTU th |
| British thermal unit | 0.94782 BTU |
| watt-hour | 0.27778 Wh |
| kilocalorie | 0.23901 kcal |
| megajoule | 0.001 MJ |
| horsepower-hour | 0.00037251 hp·h |
| kilowatt-hour | 0.00027778 kWh |
| therm | 0.0000094782 therm |
| gigajoule | 0.000001 GJ |
| million BTU | 9.4782e-07 MMBTU |
| megawatt-hour | 2.7778e-07 MWh |
| ton of TNT | 2.3901e-07 t TNT |
| tonne of oil equivalent | 2.3885e-08 toe |
| terajoule | 1.0000e-09 TJ |
| gigawatt-hour | 2.7778e-10 GWh |
| kiloton of TNT | 2.3901e-10 kt TNT |
| petajoule | 1.0000e-12 PJ |
| terawatt-hour | 2.7778e-13 TWh |
| megaton of TNT | 2.3901e-13 Mt TNT |
| quad | 9.4782e-16 quad |
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 |