How many cups of bread crumbs do need to 3 slices of bread?

Typically, 3 slices of bread yield about 1 to 1.5 cups of bread crumbs when processed. The exact amount can vary based on the type of bread and how finely it's crumbled. For a finer texture, you might end up with closer to 1.5 cups. Adjust based on your specific recipe requirements!