A kilocalorie (kcal) equals 1,000 small calories and is the unit behind the food "Calorie" shown on nutrition labels.
Kilocalories to Btu
Convert Kilocalorie (kcal) to British thermal unit (BTU) instantly with an exact formula, conversion table, and FAQ.
Reserved for a responsive leaderboard above the conversion details.
Professional calculator style
World-scale conversion engine
30+ categories
6,500+ units
Instant results
Offline ready
Energy calculator
Energy Converter
Convert kilocalories (kcal) to btu (BTU) instantly with formula, conversion table, and FAQ.
Context values
Some unit families need one extra value for a physically accurate result.
The British thermal unit (BTU) is the energy needed to raise one pound of water by one degree Fahrenheit, widely used for heating and air-conditioning ratings.
BTU = kcal × 3.965666831
Results update instantly for Kilocalories to Btu conversions.
Reserved above the conversion cards and below the converter.
Formula
BTU = kcal × 3.965666831
kcal = BTU × 0.2521644007
Conversion table
| 1 kcal | 3.965667 BTU |
| 5 kcal | 19.828334 BTU |
| 10 kcal | 39.656668 BTU |
| 20 kcal | 79.313337 BTU |
| 50 kcal | 198.283342 BTU |
| 100 kcal | 396.566683 BTU |
| 500 kcal | 1982.833416 BTU |
| 1000 kcal | 3965.666831 BTU |
Related conversions
Reserved between the cards and the FAQ so the page stays balanced.
How the formula works
Both kilocalorie and british thermal unit measure the same physical quantity, so converting between them is a single multiplication. Multiply a value in kilocalories by 3.965666831 to get btu. To reverse the conversion, multiply a british thermal unit value by 0.2521644007 to get back to kilocalories.
Frequently asked questions
What is Kilocalorie (kcal)?
A kilocalorie (kcal) equals 1,000 small calories and is the unit behind the food "Calorie" shown on nutrition labels.
What is British thermal unit (BTU)?
The British thermal unit (BTU) is the energy needed to raise one pound of water by one degree Fahrenheit, widely used for heating and air-conditioning ratings.
How do I convert kilocalories to btu?
Multiply the kilocalorie value by 3.965666831 to get the equivalent in btu. For example, 5 kcal × 3.965666831 = 19.828334 BTU.
Is this conversion exact?
Yes. Both units are defined against the SI base unit for this dimension, so the factor 3.965666831 is an exact, non-rounded value.
Can I convert btu back to kilocalories?
Yes. Divide the british thermal unit value by 3.965666831, or multiply it by 0.2521644007, to get kilocalories.
Reserved between the FAQ and the article so the page stays balanced.
About converting kilocalories to btu
A kilocalorie (kcal) equals 1,000 small calories and is the unit behind the food "Calorie" shown on nutrition labels. The British thermal unit (BTU) is the energy needed to raise one pound of water by one degree Fahrenheit, widely used for heating and air-conditioning ratings.
Use this calculator to move between kilocalories and btu accurately for homework, engineering, billing, or everyday energy calculations. The Universal Converter uses exact unit factors, so results stay consistent across the site.