According to the USDA, a 38 g slice of white toast has 110 calories, 3.5 g protein, 1.5 g fat, 20.5 g carbohydrates, 1 g fiber and 1.8 g sugar. The same sized slice of whole wheat toast has 115 calories, 6 g protein, 1.5 g fat, 19.5 g carbohydrates, 3.5 g fiber and 2 g sugar. An equivalent slice of multigrain toast, which typically contains a variety of whole grains, has 110 calories, 5.5 g protein, 1.75 g fat, 18 g carbohydrates, 3 g fiber and 2.5 g sugar. A tablespoon of salted butter adds 100 calories and 11.5 g fat to a slice of toast.