Convert joule to British thermal unit
1 J = 0.0009478171203 BTU
1 J = 0.000948 BTU
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 0.0009478171203 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 |