Milliwatts to kilocalories per second converter above calculates how many kilocalories per second are in 'X' milliwatts (where 'X' is the number of milliwatts to convert to kilocalories per second). In order to convert a value from milliwatts to kilocalories per second (from mW to kcal/s) just type the number of mW to be converted to kcal/s and then click on the 'convert' button.