Convert Calories (thermo) to BTU (IT)

Calories (thermo) → BTU (IT)
cal × 0.003965667 = BTU BTU × 252.1644 = cal

To convert calories (thermo) (cal) to btu (it) (BTU), multiply the calories (thermo) value by 0.003965667. 1 cal = 0.003965667 BTU, and 1 BTU = 252.1644 cal. The conversion is a linear scaling with no offset, so the same factor applies to any value.

Going the other way? Convert BTU to cal.

cal to BTU table
Calories (thermo) (cal) BTU (IT) (BTU)
0.1 cal 0.0003965667 BTU
0.5 cal 0.001982833 BTU
1 cal 0.003965667 BTU
2 cal 0.007931334 BTU
5 cal 0.01982833 BTU
10 cal 0.03965667 BTU
20 cal 0.07931334 BTU
50 cal 0.1982833 BTU
100 cal 0.3965667 BTU
500 cal 1.982833 BTU
1000 cal 3.965667 BTU