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