The kilojoule or kilocalorie is the unit used for the measurement of energy in food. Within the European Union, both the kilocalorie ("kcal") and kilojoule ("kJ") appear on nutrition labels. Thus, 1 kilocalorie (kcal) = 1000 calories (cal). This is equivalent to a thousand calories (abbreviated "cal") or one kilocalorie (kcal). This would represent less than 10% of kilocalories in a notional 2,200 kilocalorie ration. Blue whale milk contains 18 megajoules (MJ) per kg, which is roughly 4,302 Kilocalorie/kg.