Convert kilocalorie to British thermal unit
1 kcal = 3.965666831 BTU
1 kcal = 3.9657 BTU
1 kcal in every energy unit
| electron volt | 2.6114e+22 eV |
| hartree | 9.5969e+20 Eh |
| kiloelectron volt | 2.6114e+19 keV |
| megaelectron volt | 2.6114e+16 MeV |
| gigaelectron volt | 26,114,000,000,000 GeV |
| nanojoule | 4,184,000,000,000 nJ |
| erg | 41,840,000,000 erg |
| teraelectron volt | 26,114,000,000 TeV |
| microjoule | 4,184,000,000 µJ |
| millijoule | 4,184,000 mJ |
| inch-pound | 37,032 in·lb |
| joule | 4,184 J |
| foot-pound | 3,086 ft⋅lb |
| calorie | 1,000 cal |
| calorie (International Table) | 999.33 cal IT |
| kilojoule | 4.184 kJ |
| BTU (thermochemical) | 3.9683 BTU th |
| British thermal unit | 3.9657 BTU |
| watt-hour | 1.1622 Wh |
| kilocalorie | 1 kcal |
| megajoule | 0.004184 MJ |
| horsepower-hour | 0.0015586 hp·h |
| kilowatt-hour | 0.0011622 kWh |
| therm | 0.000039657 therm |
| gigajoule | 0.000004184 GJ |
| million BTU | 0.0000039657 MMBTU |
| megawatt-hour | 0.0000011622 MWh |
| ton of TNT | 0.000001 t TNT |
| tonne of oil equivalent | 9.9933e-08 toe |
| terajoule | 4.1840e-09 TJ |
| gigawatt-hour | 1.1622e-09 GWh |
| kiloton of TNT | 1.0000e-09 kt TNT |
| petajoule | 4.1840e-12 PJ |
| terawatt-hour | 1.1622e-12 TWh |
| megaton of TNT | 1.0000e-12 Mt TNT |
| quad | 3.9657e-15 quad |
How the conversion works
Multiply by 3.965666831 to go from kilocalorie 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 kilocalorie — 1 BTU = 0.2521644007 kcal.
kilocalorie to British thermal unit — common values
| 1 kcal | 3.9656668 BTU |
| 2 kcal | 7.9313337 BTU |
| 3 kcal | 11.897 BTU |
| 5 kcal | 19.828334 BTU |
| 10 kcal | 39.656668 BTU |
| 15 kcal | 59.485002 BTU |
| 20 kcal | 79.313337 BTU |
| 25 kcal | 99.141671 BTU |
| 50 kcal | 198.28334 BTU |
| 75 kcal | 297.42501 BTU |
| 100 kcal | 396.56668 BTU |
| 250 kcal | 991.41671 BTU |
| 500 kcal | 1,982.8334 BTU |
| 1000 kcal | 3,965.6668 BTU |