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 to Kilocalories
Convert British thermal unit (BTU) to Kilocalorie (kcal) instantly with an exact formula, conversion table, and FAQ.
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Convert btu (BTU) to kilocalories (kcal) instantly with formula, conversion table, and FAQ.
Context values
Some unit families need one extra value for a physically accurate result.
A kilocalorie (kcal) equals 1,000 small calories and is the unit behind the food "Calorie" shown on nutrition labels.
kcal = BTU × 0.2521644007
Results update instantly for Btu to Kilocalories conversions.
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Formula
kcal = BTU × 0.2521644007
BTU = kcal × 3.965666831
Conversion table
| 1 BTU | 0.252164 kcal |
| 5 BTU | 1.260822 kcal |
| 10 BTU | 2.521644 kcal |
| 20 BTU | 5.043288 kcal |
| 50 BTU | 12.608220 kcal |
| 100 BTU | 25.216440 kcal |
| 500 BTU | 126.082200 kcal |
| 1000 BTU | 252.164401 kcal |
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How the formula works
Both british thermal unit and kilocalorie measure the same physical quantity, so converting between them is a single multiplication. Multiply a value in btu by 0.2521644007 to get kilocalories. To reverse the conversion, multiply a kilocalorie value by 3.965666831 to get back to btu.
Frequently asked questions
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.
What is Kilocalorie (kcal)?
A kilocalorie (kcal) equals 1,000 small calories and is the unit behind the food "Calorie" shown on nutrition labels.
How do I convert btu to kilocalories?
Multiply the british thermal unit value by 0.2521644007 to get the equivalent in kilocalories. For example, 5 BTU × 0.2521644007 = 1.260822 kcal.
Is this conversion exact?
Yes. Both units are defined against the SI base unit for this dimension, so the factor 0.2521644007 is an exact, non-rounded value.
Can I convert kilocalories back to btu?
Yes. Divide the kilocalorie value by 0.2521644007, or multiply it by 3.965666831, to get btu.
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About converting btu to kilocalories
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. A kilocalorie (kcal) equals 1,000 small calories and is the unit behind the food "Calorie" shown on nutrition labels.
Use this calculator to move between btu and kilocalories accurately for homework, engineering, billing, or everyday energy calculations. The Universal Converter uses exact unit factors, so results stay consistent across the site.