Convert 645 Kilocalories to British Thermal Units

645 Kilocalories (kcal)

1 kcal = 3.96842 BTUth

2,559.63 British Thermal Units (BTUth)

1 BTUth = 0.25199 kcal

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The answer is 0.25199 British Thermal Unit

645 Kilocalorie is equal to 2,559.63 British Thermal Unit. Formula to convert 645 kcal to BTUth is 645 / 0.2519896500000025

The answer is 162.533 Kilocalories