As for the bread, it should say on the packet (unless you buy your's fresh, in which case, ask your baker), you just have to multiply the amount of calories in a slice of bread by two. I don't think you put on too much butter on your bread, so it's a little more than the amount of calories in two slices of bread.read and butter facts 1 slice regular cut bread, toasted with butter 117kcal 1 slice of bread, toasted with butter and jam 143kcal 1 slice toast 65kcal. catherinemeganwhite · 9 years ago. Thumbs up. 3.