Joules to thermochemical / food kilocalories: 1 J = 0.00023900573614 kcalth
Joules to international kilocalories: 1 J = 0.00023884589663 kcalit
Joules to 15oC kilocalories: 1 J = 0.00023892008123 kcal15
Joules to 15oC kilocalories: 1 J = 0.00023912003826 kcal15