How Do You Read Lumber Sizes?-Free Lumber Size Chart

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If you’re new to woodworking you have probably noticed when going to start your project that your so called 1×2 is actually a 3/4″x1-1/2″. Confusing, right?

I have made a printable lumber size for you so you can download and/or print it to hang in your workspace.

Now let’s go over the history of why the actual lumber dimensions are different from the nominal dimensions.

What is the difference between nominal & actual lumber dimensions?

You’re probably wondering why would someone make wood dimensions so confusing? I totally agree but there is a good explanation to this madness.

Nominal lumber sizes are your common names that we all know like 1×2, 2×4, 1×3. The nominal dimensions are the size of the board before it is ran through the planer, squared to size and kiln dried.

Nominal Lumber Sizes

The actual lumber dimensions refer to only the width and depth of the board but not the length. Keep in mind that the actual lumber size is anywhere from 1/4 to 3/4 inch smaller than its nominal lumber size.

Actual Lumber Sizes

The nominal lumber dimensions are your common board size names like 1×2 and 2×4.

Why are lumber sizes different than the actual lumber dimensions?

When wood is cut down, trimmed to size, squared off and dried out you will always have shrinkage. As the years have gone by our process of creating lumber has gotten more consistent. Making it easier for big box stores to sell lumber that is consistent in size.

Swipe up to learn more!

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