Calories to BTU Converter
Convert calories (cal) to British thermal units (BTU)
Result
0.003965666831 BTU
BTU
1 cal = 0.003965666831 BTU
1 cal in other units
- 1Enter a valueType the number to convert
- 2Pick the unitsChoose what to convert from and to
- 3Read the resultSee it in every other unit too
How to convert calories to British thermal units
One calorie equals 0.003965667 British thermal units, so multiply the number of calories by 0.003965667.
BTU = cal × 0.003965667
1 cal = 0.003965667 BTU · 1 BTU = 252.1644 cal
Worked example
To convert 5 calories to British thermal units: 5 cal × 0.003965667 = 0.01982833 BTU.
About calories (cal)
A (small) calorie is 4.184 J, the energy to warm 1 g of water by 1 °C. Food “Calories” are actually kilocalories.
About British thermal units (BTU)
A British thermal unit is about 1,055 J, used for heating and air-conditioning in the US.
More conversions
Calories to other units
Frequently asked questions
How many British thermal units are in one calorie?
One calorie equals 0.003965667 British thermal units.
How many calories are in one British thermal unit?
One British thermal unit equals 252.1644 calories.
How do I convert calories to British thermal units?
Use the formula BTU = cal × 0.003965667. For example, 5 cal × 0.003965667 = 0.01982833 BTU.