Convert Calories to British Thermal Units
1 calorie = 0.003965667 British thermal units. Type any value below to convert in either direction — the calculation happens in your browser.
Calories to British Thermal Units formula
Multiply the number of calories by 0.003965667 to get British thermal units.
British thermal units = calories × 0.003965667To go the other way: divide the number of British thermal units by 0.003965667, or multiply by 252.164401.
calories = British thermal units ÷ 0.003965667Calories to British Thermal Units conversion table
| Calories | British Thermal Units |
|---|---|
| 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 |
| 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 |
| 75 cal | 0.297425 BTU |
| 100 cal | 0.3965667 BTU |
| 250 cal | 0.9914167 BTU |
| 500 cal | 1.982833 BTU |
| 1,000 cal | 3.965667 BTU |
British Thermal Units to Calories conversion table
| British Thermal Units | Calories |
|---|---|
| 1 BTU | 252.164401 cal |
| 2 BTU | 504.328801 cal |
| 3 BTU | 756.493202 cal |
| 4 BTU | 1,008.658 cal |
| 5 BTU | 1,260.822 cal |
| 6 BTU | 1,512.986 cal |
| 7 BTU | 1,765.151 cal |
| 8 BTU | 2,017.315 cal |
| 9 BTU | 2,269.48 cal |
| 10 BTU | 2,521.644 cal |
About the calorie
A thermochemical calorie is exactly 4.184 joules — the energy to heat one gram of water by one degree Celsius.
About the British thermal unit
A BTU is the energy needed to raise one pound of water by one degree Fahrenheit, about 1,055 joules.
Frequently asked questions
How many British thermal units are in a calorie?
There are 0.003965667 British thermal units in one calorie.
How many calories are in a British thermal unit?
There are 252.164401 calories in one British thermal unit.
Is this conversion exact?
The ratio between the calorie and the British thermal unit is fixed by definition, so the conversion is exact — the figures shown here are rounded for readability only.
What is 10 calories in British thermal units?
10 calories equals 0.03965667 British thermal units.
Related energy conversions
- Joules to British Thermal Units
- Kilojoules to British Thermal Units
- Calories to Joules
- Calories to Kilojoules
- Calories to Kilocalories
- Calories to Watt Hours
- Calories to Kilowatt Hours
- Calories to Electronvolts
- Calories to Foot Pounds
- Kilocalories to British Thermal Units
- Watt Hours to British Thermal Units
- Kilowatt Hours to British Thermal Units
- Electronvolts to British Thermal Units
- Foot Pounds to British Thermal Units