Calories to British Thermal Units Converter
EngineeringJoules, calories, kilowatt-hours and more.
How to convert Calories to British Thermal Units
Multiply the calories value by 0.00396565: 1 cal = 0.00396565 BTU. Going the other way, 1 BTU = 252.165 cal, so divide by 0.00396565 or use the British Thermal Units to Calories converter.
About these units
Calories (cal)
The calorie used here is the thermochemical calorie, exactly 4.184 joules, roughly the energy needed to warm one gram of water by one degree Celsius. Food calories are actually kilocalories.
British Thermal Units (BTU)
A British thermal unit is the energy needed to raise one pound of water by one degree Fahrenheit, about 1,055 joules. Heating and air-conditioning capacities are rated in BTU per hour.
Calories to British Thermal Units conversion table
| Calories (cal) | British Thermal Units (BTU) |
|---|---|
| 1 cal | 0.00396565 BTU |
| 2 cal | 0.0079313 BTU |
| 3 cal | 0.011897 BTU |
| 4 cal | 0.0158626 BTU |
| 5 cal | 0.0198283 BTU |
| 10 cal | 0.0396565 BTU |
| 20 cal | 0.079313 BTU |
| 25 cal | 0.0991413 BTU |
| 50 cal | 0.198283 BTU |
| 100 cal | 0.396565 BTU |
| 500 cal | 1.98283 BTU |
| 1,000 cal | 3.96565 BTU |