Calorie (cal)
The calorie is used for heat energy and often appears in nutrition and chemistry.
History: the calorie originated in heat science as a quantity of heat related to warming water.
Quickly convert calories to BTU without lookup tables or manual math.
This page is focused on converting calories to BTU. Type a number into the first field and the result appears immediately in the second field.
Example: 1 cal = 0.0039656668 BTU. Conversion formula: result = value × 4.184 / 1055.05585262.
Use this converter for everyday calculations, study notes, engineering checks, and quick value verification without installing a separate app.
The calorie is used for heat energy and often appears in nutrition and chemistry.
History: the calorie originated in heat science as a quantity of heat related to warming water.
BTU is used in heat engineering, air conditioning, heating, and English-language engineering tables.
History: BTU began in British heat engineering as the heat required to warm a pound of water by one degree Fahrenheit.
Enter a value in the Calorie field. The converter applies the formula "result = value × 4.184 / 1055.05585262" and immediately shows the result in BTU.
1 cal = 0.0039656668 BTU.
Yes. Use the swap button or choose the reverse pair from the full conversion list.