Convert British thermal unit to kilocalorie
1 BTU = 0.2521644007 kcal
1 BTU = 0.25216 kcal
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 0.2521644007 to go from British thermal unit to kilocalorie, 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? kilocalorie to British thermal unit — 1 kcal = 3.965666831 BTU.
British thermal unit to kilocalorie — common values
| 1 BTU | 0.2521644 kcal |
| 2 BTU | 0.5043288 kcal |
| 3 BTU | 0.7564932 kcal |
| 5 BTU | 1.260822 kcal |
| 10 BTU | 2.521644 kcal |
| 15 BTU | 3.782466 kcal |
| 20 BTU | 5.043288 kcal |
| 25 BTU | 6.30411 kcal |
| 50 BTU | 12.60822 kcal |
| 75 BTU | 18.91233 kcal |
| 100 BTU | 25.21644 kcal |
| 250 BTU | 63.0411 kcal |
| 500 BTU | 126.0822 kcal |
| 1000 BTU | 252.1644 kcal |