Out of all fruits, cranberries have one of the lowest amounts of sugar. In every cup of cranberries, there is only 4g of sugar. This compares to raspberries, blackberries, and strawberries, which have 5, 7, and 7 grams of sugar per cup, respectively. Other similar fruits such as cherries and grapes, have 18 and 15 grams of sugar per cup, respectively.
For dried cranberries, these products can be compared to raisins. There is less total sugar in dried cranberries as compared to raisins, but because raisins are naturally sweet, the added sugar is less in raisins than in dried cranberries.