Convert calories to BTU
Calories to British thermal units. Enter a value to convert, or use the calories to BTU chart further down the page.
1 calorie equals 0.003965666831 British thermal units. Going the other way, 1 British thermal unit = 252.1644007 calories.
How to convert calories to BTU
To convert calories to British thermal units, multiply the calorie value by 0.003965666831. You can also divide by 252.1644007 to get the same answer.
BTU = cal × 0.003965666831
Worked example
Convert 15 cal to British thermal units:
15 cal = 0.05948500247 BTU
calories to BTU conversion chart
Use this calories to BTU table for quick reference without typing anything.
| calories (cal) | British thermal units (BTU) |
|---|---|
| 0.01 cal | 0.00003965666831 BTU |
| 0.1 cal | 0.0003965666831 BTU |
| 1 cal | 0.003965666831 BTU |
| 2 cal | 0.007931333663 BTU |
| 3 cal | 0.01189700049 BTU |
| 5 cal | 0.01982833416 BTU |
| 10 cal | 0.03965666831 BTU |
| 20 cal | 0.07931333663 BTU |
| 50 cal | 0.1982833416 BTU |
| 100 cal | 0.3965666831 BTU |
| 1,000 cal | 3.965666831 BTU |
What is a calorie?
The thermochemical calorie is defined as exactly 4.184 joules. Note that the “calories” on food labels are actually kilocalories.
What is a British thermal unit?
The BTU is the energy needed to raise one pound of water by one degree Fahrenheit — about 1,055 joules. It rates heating and air-conditioning equipment in the US.
Frequently asked questions
How many BTU are in a calorie?
1 calories equals 0.003965666831 BTU. Going the other way, 1 BTU is 252.1644007 calories.
How do you convert calories to BTU?
To convert calories to British thermal units, multiply the calorie value by 0.003965666831. You can also divide by 252.1644007 to get the same answer.
What is 10 calories in BTU?
10 calories equals 0.03965666831 BTU. The conversion chart on this page lists the other values people look up most often.
Related energy conversions
Convert calories to other units
- BTU to calories
- calories to joules
- calories to kilojoules
- calories to kilocalories
- calories to kWh
- calories to Wh
- calories to foot pounds
Convert other units to BTU
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