Home›Browse›G›gram caloriegram calorieOur editors are putting together more complete content — check back in about 20 minutesgram caloriegram calorie — nounnoun1. amount of heat needed to raise 1 gram of water by 1°C1.nounDefinitionamount of heat needed to raise 1 gram of water by 1°CExampleOne gram calorie is a tiny unit of energy.