Calories to Btus Converter
Convert calorie to British thermal unit instantly. Type a value below — the result updates as you type.
When you need to convert calorie to British thermal unit
Energy conversions appear on nutrition labels, utility bills and appliance specs, letting you compare food energy, electricity use and heating output on a common scale.
Typical values: 0.5 cal is about 0.002 BTU, and 100 cal works out to roughly 0.3966 BTU. Because the ratio is fixed at 0.004, you can scale any amount linearly — doubling the calories doubles the BTUs.
Food packaging, power meters and heating equipment each prefer different energy units, so converting makes them directly comparable.
How to convert calorie to British thermal unit
One calorie equals 0.004 BTUs. To convert, multiply the number of calories by 0.004:
BTUs = calories × 0.004
For example, 10 calories × 0.004 = 0.0397 BTUs.
Calories to BTUs conversion table
| Energy (cal) | Btus (BTU) |
|---|---|
| 1 cal | 0.004 BTU |
| 2 cal | 0.0079 BTU |
| 3 cal | 0.0119 BTU |
| 5 cal | 0.0198 BTU |
| 10 cal | 0.0397 BTU |
| 20 cal | 0.0793 BTU |
| 50 cal | 0.1983 BTU |
| 100 cal | 0.3966 BTU |
FAQ
How many BTUs are in a calorie?
One calorie = 0.004 BTUs.
How do I convert BTUs back to calories?
Divide by 0.004, or use the BTUs to calories converter.