The only way 1″ thick rough-cut hardwood lumber can plane out completely to 13/16″ or 3/4″ thick is to skip the flattening ... These are the sizes you should expect to find when shopping ...

Common lumber: This is just plain wood, old-fashioned 2-by-4s and 2-by-6s and 1-by-12s. The measurements refer to rough-cut lumber. With milled lumber, customers pay for a lot of sawdust left ...

Home Depot argues that if you want a dressed piece of lumber that is actually 4″ x 4″, that lumber’s nominal dimension would actually be 4.5″ x 4.5″ but “No such size or product exists.” ...