Convert British thermal unit to calorie
1 BTU = 252.1644007 cal
1 BTU = 252 cal
1 BTU in every energy unit
| joule | 1,060 J |
| kilojoule | 1.06 kJ |
| megajoule | 0.00106 MJ |
| calorie | 252 cal |
| kilocalorie | 0.252 kcal |
| watt-hour | 0.293 Wh |
| kilowatt-hour | 0.000293 kWh |
| British thermal unit | 1 BTU |
| foot-pound | 778 ft⋅lb |
| electron volt | 6.59e+21 eV |
| kiloelectron volt | 6.59e+18 keV |
| megaelectron volt | 6.59e+15 MeV |
How the conversion works
Multiply by 252.1644007 to go from British thermal unit to calorie, 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? calorie to British thermal unit — 1 cal = 0.003965666831 BTU.
British thermal unit to calorie — common values
| 1 BTU | 252.1644 cal |
| 2 BTU | 504.3288 cal |
| 3 BTU | 756.4932 cal |
| 5 BTU | 1,260.822 cal |
| 10 BTU | 2,521.644 cal |
| 15 BTU | 3,782.466 cal |
| 20 BTU | 5,043.288 cal |
| 25 BTU | 6,304.11 cal |
| 50 BTU | 12,608.22 cal |
| 75 BTU | 18,912.33 cal |
| 100 BTU | 25,216.44 cal |
| 250 BTU | 63,041.1 cal |
| 500 BTU | 126,082.2 cal |
| 1000 BTU | 252,164.4 cal |