The thickness of hardwood lumber is measured in quarters of an inch. So a 4/4 (four- quarters) would be 1″. This is the thickness before surfacing and the number you use to calculate board feet. This is also the thickness you pay for, even though, after planing, the thickness may be only 3/4″. The chart shows the typical thickness for hardwood lumber before and after planing. (What is softwood?)
4/4 = 1″ 13/16″ 3/4″
5/4 = 1-1/4″ 1-1/16″ 1-13/32″
6/4 = 1-1/2″ 1-1/4″ 1-13/32″
8/4 = 2″ 1 3/4″ 1-1/2″
4/4 (four-quarter) lumber is 1″ thick when rough sawn. When 4/4 lumber is planed, it is typically finished at 13/16″ thick.
5/4 (five-quarter) lumberis 1.25″ thick when rough sawn. When 5/4 lumber is planed, typically it is finished at 1.063″ thick.
6/4 (six-quarter) lumber is 1.5″ thick when rough sawn. When 6/4 lumber is planed, typically it is finished at 1.25″ thick.
8/4 (eight-quarter) lumber is 2″ thick when rough sawn. When 8/4 lumber is planed, typically it is finished at 1.75″ thick.
12/4 (twelve-quarter) lumber is 3″ thick when rough sawn. When 12/4 lumber is planed, typically it is finished at 2.75″ thick.
16/4 (sixteen-quarter) lumber is 4″ thick when rough sawn. When 16/4 lumber is planed, typically it is finished at 3.75″ thick.
We’ve worked with everything we sell, and we only sell what works.
If you need it, KenCraft carries it.
We’re talking about well over 50 products for your projects, including some of the best- known names in woodworking supplies. And we maintain reliable inventory of the “small stuff” woodworkers depend on:
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Since 1965, KenCraft Company, Inc. has dominated the hardwood lumber industry in Northwest Ohio and Southeast Michigan. Today, KenCraft is a family-owned and family-operated company in its 2nd generation.