A unit of measurement of energy. One kilocalorie equals 1 000 calories. In the International System of Units (SI), the universal unit of energy is the joule (J). One kilocalorie = 4.184 kilojoules (kJ).[1]As a general rule, adults require 2,100 Kcal per day. To convert items to kcal, a useful tool is the NutVal calculator.[2]
[1]“The State of Food Insecurity in the World 2015” available at http://www.fao.org/3/a-i4646e.pdf