BTU Conversions

Use this easy and mobile-friendly calculator to convert between BTUs and other units of Energy.
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1 BTU ≈
0.25216444 Nutritional Calories
result rounded
Decimal places
A British thermal unit is the amount of energy required to heat a pound of water by 1 degree Fahrenheit. This can vary slightly depending on the temperature of the water, therefore different estimates for the BTU exist. The International Standards Organization defines a BTU as 1055.056 joules.
A nutritional Calorie, or kilocalorie, is commonly used in food labeling. It is equal to 4.184 kilojoules. The average American consumes about 2,700 kilocalories per day.