Convert British thermal unit to kilojoule
1 BTU = 1.055055853 kJ
1 BTU = 1.0551 kJ
1 BTU in every energy unit
| electron volt | 6.5851e+21 eV |
| hartree | 2.4200e+20 Eh |
| kiloelectron volt | 6.5851e+18 keV |
| megaelectron volt | 6.5851e+15 MeV |
| gigaelectron volt | 6,585,100,000,000 GeV |
| nanojoule | 1,055,100,000,000 nJ |
| erg | 10,551,000,000 erg |
| teraelectron volt | 6,585,100,000 TeV |
| microjoule | 1,055,100,000 µJ |
| millijoule | 1,055,100 mJ |
| inch-pound | 9,338 in·lb |
| joule | 1,055.1 J |
| foot-pound | 778.17 ft⋅lb |
| calorie | 252.16 cal |
| calorie (International Table) | 252 cal IT |
| kilojoule | 1.0551 kJ |
| BTU (thermochemical) | 1.0007 BTU th |
| British thermal unit | 1 BTU |
| watt-hour | 0.29307 Wh |
| kilocalorie | 0.25216 kcal |
| megajoule | 0.0010551 MJ |
| horsepower-hour | 0.00039301 hp·h |
| kilowatt-hour | 0.00029307 kWh |
| therm | 0.00001 therm |
| gigajoule | 0.0000010551 GJ |
| million BTU | 0.000001 MMBTU |
| megawatt-hour | 2.9307e-07 MWh |
| ton of TNT | 2.5216e-07 t TNT |
| tonne of oil equivalent | 2.5200e-08 toe |
| terajoule | 1.0551e-09 TJ |
| gigawatt-hour | 2.9307e-10 GWh |
| kiloton of TNT | 2.5216e-10 kt TNT |
| petajoule | 1.0551e-12 PJ |
| terawatt-hour | 2.9307e-13 TWh |
| megaton of TNT | 2.5216e-13 Mt TNT |
| quad | 1.0000e-15 quad |
How the conversion works
Multiply by 1.055055853 to go from British thermal unit 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 British thermal unit — 1 kJ = 0.9478171203 BTU.
British thermal unit to kilojoule — common values
| 1 BTU | 1.0550559 kJ |
| 2 BTU | 2.1101117 kJ |
| 3 BTU | 3.1651676 kJ |
| 5 BTU | 5.2752793 kJ |
| 10 BTU | 10.550559 kJ |
| 15 BTU | 15.825838 kJ |
| 20 BTU | 21.101117 kJ |
| 25 BTU | 26.376396 kJ |
| 50 BTU | 52.752793 kJ |
| 75 BTU | 79.129189 kJ |
| 100 BTU | 105.50559 kJ |
| 250 BTU | 263.76396 kJ |
| 500 BTU | 527.52793 kJ |
| 1000 BTU | 1,055.0559 kJ |