For a person without diabetes, the normal glucose levels should be in the range of 70 to 120 mg/dl. According to American Diabetes Association, the normal glucose range for diabetics should always be less than 154 mg/dl. The normal glucose range for children before breakfast should be in the range 70 to 99 mg/dl. Two to four hours after a meal, the normal glucose range should be between 70 to 139 mg/dl. We will now see the normal range for glucose at different times of the day.