A small peach contains 6.34 grams of carbohydrates, according to FatSecret.com. A medium-sized peach has 7.85 grams of carbohydrates and a large peach has 12.58 grams of carbohydrates.
Half a cup of peach slices has 6.81 grams of carbohydrates, and a whole cup of peach slices contains 13.62 grams of carbohydrates. Peaches also contain fiber; 1.2 grams of fiber are in one small peach, and a large peach has 2.4 grams of fiber. A cup of peach slices also has 1.55 grams of protein and 19 percent of the recommended daily amount of vitamin C. One cup of peach slices is packed with 11 percent of the recommended daily amount of vitamin A.