Convert joule to British thermal unit
1 J = 0.0009478171203 BTU
1 J = 0.00094782 BTU
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 0.0009478171203 to go from joule to British thermal unit, 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? British thermal unit to joule — 1 BTU = 1,055.055853 J.
joule to British thermal unit — common values
| 1 J | 0.00094781712 BTU |
| 2 J | 0.0018956342 BTU |
| 3 J | 0.0028434514 BTU |
| 5 J | 0.0047390856 BTU |
| 10 J | 0.0094781712 BTU |
| 15 J | 0.014217257 BTU |
| 20 J | 0.018956342 BTU |
| 25 J | 0.023695428 BTU |
| 50 J | 0.047390856 BTU |
| 75 J | 0.071086284 BTU |
| 100 J | 0.094781712 BTU |
| 250 J | 0.23695428 BTU |
| 500 J | 0.47390856 BTU |
| 1000 J | 0.94781712 BTU |