What is kcal? - RapidTables.com
www.rapidtables.com › convert › energykcal definition kcal is the symbol of kilocalorie. One kilocalorie is equal to 1000 calories. Small & large calories Small calorie (cal) is the energy needed to increase 1 gram of water by 1°C at a pressure of 1 atmosphere. Large calorie (Cal) is the energy needed to increase 1 kg of water by 1°C at a pressure of 1 atmosphere.