That would really depend on what kind of bread. In white there are approx. 45 calories a slice. Nowadays with more people being health conscience there are so many different kinds of bread available. Not only are there different flavors and ingredients within the same kind there are also breads that are thicker sliced than others too. You can get light breads, gluten free breads, and a long list of every bread you can think of. Homemade bread can be made to fit an individuals likes, dislikes and needs. Bread machines allow the maker to add a number of extra ingredients. Noone can give an exact answer to your question without more info.
Most breads, including whole grain bread have about 100 calories per slice.
It depends on what kind of bread you buy