Thermochemical / food kilocalories to joules: 1 kcalth = 4184 J
International kilocalories to joules: 1 kcalIT = 4186.8 J
15oC kilocalories to joules: 1 kcal15 = 4185.5 J
20oC kilocalories to joules: 1 kcalth = 4182 J