The amount of sugar in an apple is an important factor in how flavourful it is. The sugar content of an apple depends on its size and variety.
Apples average about 3 grams of sugar per ounce. According to the California Apple Commission, a medium apple weighing 156gr. has 16 grams of sugar. The Washington Apple Commission states that a large, 227gr apple contains 25 grams of sugar.
Some apple varieties are sweeter than others. Red and Golden Delicious have 11 to 15 per cent sugar. Granny Smith apples have 12 to 18 per cent sugar. The sugar content of Gala apples is 14 to 16 per cent. Fuji is one of the sweetest varieties with 16 to 18 per cent sugar.
Sugar accounts for about 73 per cent of the carbohydrates in an apple. Fibre makes up most of the remaining carbohydrates. A medium apple contains about 5 grams of fibre.