In a single slice of a 14-inch pizza, carbohydrates vary between 24 grams for thin crust and 38 grams for thick crust, according to the USDA. The exact number of carbohydrates in pizza varies depending on size and crust style.
Different pizza chains and styles vary greatly as well. Domino's pizza varies between 16 grams of carbohydrates per serving and 40 grams of carbohydrates depending on pizza style and size. The amount of pizza eaten affects the number of carbohydrates as well. Most serving sizes are considered to be a single slice, but many times diners eat more than one slice.