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Don't be confused by “nominal” board dimensions when you buy lumber or read plans. We show you the quick translation to “actual” numbers.
By the DIY experts of The Family Handyman Magazine
Learning the system takes only a few minutes
This chart shows the nominal (in name only) and corresponding actual (real) dimensions of common wood sizes.
Note: The chart can be downloaded and printed from Additional Information below.
If you find reading plans confusing, or have trouble identifying the exact dimensions of wood at a lumberyard or home center, read on. Most lumber is sold in “nominal” (in name only) sizes such as 1x3, 2x4 and 4x4. But these sizes are not the actual dimensions of the wood. The chart below shows the actual dimensions of lumber when it is dry (when wet, it will be slightly larger). This handy chart will help you translate the nominal into the actual (dry). After a while, you'll get the hang of it.
Share what's on your mind and see what other DIYers are thinking about.
October 19, 12:07 PM [GMT -5]
Yes, I noticed my incorrect math. "5.75" width..." should be 5.25" Hence the reason I am looking for dimension help. God bless.
October 19, 12:02 PM [GMT -5]
This was helpful, thanks. You listed Thickness as 1/2" less than indicated at stores. And Width in inches is 3/4" less than indicated. Does this "Inches" conversion also relate to the Feet of length that stores indicate. For instance a 2 x 6 x 8 is actually: 1.5" x 5.75" with 8' length or 7ft 11.25" length?
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