Calories to British Thermal Units
Convert calories (cal) to British thermal units (BTU). Type in either box; the other updates as you go.
How to convert calories to British thermal units
To convert calories to British thermal units, multiply the number of calories by 0.003965666831.
Example
Convert 5 calories to British thermal units:
Calorie to British thermal unit conversion chart
| Calories (cal) | British Thermal Units (BTU) |
|---|---|
| 1 cal | 0.003965667 BTU |
| 2 cal | 0.007931334 BTU |
| 3 cal | 0.011897 BTU |
| 4 cal | 0.01586267 BTU |
| 5 cal | 0.01982833 BTU |
| 6 cal | 0.023794 BTU |
| 7 cal | 0.02775967 BTU |
| 8 cal | 0.03172533 BTU |
| 9 cal | 0.035691 BTU |
| 10 cal | 0.03965667 BTU |
| 12 cal | 0.047588 BTU |
| 15 cal | 0.059485 BTU |
| 20 cal | 0.07931334 BTU |
| 25 cal | 0.09914167 BTU |
| 30 cal | 0.11897 BTU |
| 40 cal | 0.1586267 BTU |
| 50 cal | 0.1982833 BTU |
| 60 cal | 0.23794 BTU |
| 70 cal | 0.2775967 BTU |
| 75 cal | 0.297425 BTU |
| 80 cal | 0.3172533 BTU |
| 90 cal | 0.35691 BTU |
| 100 cal | 0.3965667 BTU |
| 150 cal | 0.59485 BTU |
| 200 cal | 0.7931334 BTU |
| 250 cal | 0.9914167 BTU |
| 500 cal | 1.982833 BTU |
| 1,000 cal | 3.965667 BTU |
Going the other way? See the British thermal units to calories chart.
About the units
Calorie (cal)
A small calorie (thermochemical) is exactly 4.184 joules, the energy to warm one gram of water by about one degree Celsius.
British Thermal Unit (BTU)
A British thermal unit (International Table) is about 1,055 joules, the heat that warms one pound of water by one degree Fahrenheit.
Frequently asked questions
How many British thermal units are in a calorie?
There are 0.003965666831 British thermal units in a calorie.
How many calories are in a British thermal unit?
There are 252.1644007 calories in a British thermal unit.
How do you convert calories to British thermal units?
To convert calories to British thermal units, multiply the number of calories by 0.003965666831.
What is 5 calories in British thermal units?
5 calories equals 0.0198283 British thermal units.
Convert between joules, calories, kilocalories, kilowatt-hours and BTU. Open the energy converter to see a value in every unit at once.