downsizingnow48
Elite Member
Both Lowes and HD give the actual size as well as the nominal size in their website product descriptions. I am pretty sure they have for a long time. They probably have whole buildings full of lawyers who work on stuff like that.
Shop (Common: 2-in x 4-in x 8-ft; Actual: 1.5-in x 3.5-in x 8-ft) Stud at Lowes.com
Shop (Common: 2-in x 4-in x 8-ft; Actual: 1.5-in x 3.5-in x 8-ft) Stud at Lowes.com