ounces to calories
1 Divide total intake by 30 mLâs per ounce. 2  This gives you total ounces in. 3  Multiply total ounces in by number of calories per ounce. 4  Infant formulas are usually 20 kcal/oz, but these are often fortified to 22, 24, or 30 kcal/oz. 5  This gives you total calories per day. 6  Divide by weight in kg. 7  This gives you kcal/kg/day. This gives you total mLs. 2  Divide total intake by 30 mLâs per ounce. 3  This gives you total ounces in. 4  Multiply total ounces in by number of calories per ounce. 5  Infant formulas are usually 20 kcal/oz, but these are often fortified to 22, 24, or 30 kcal/oz. 6  This gives you total calories per day. 7  Divide by weight in kg.