Nominal vs Actual Dimensions |

Nominal vs Actual Dimensions |

Lumber is cut to a standard length, width, and depth. However, there is a difference between nominal and actual lumber dimensions.

The standard for converting nominal to actual dimensions is as follows:

  • Subtract ¼ inches for dimensions under 2 inches
  • Subtract ½ inches for dimensions from 2 inches to 8 inches
  • Subtract ¾ inches for dimensions equal to or larger than 8 inches

For quick reference, use the following tables to determine the actual lumber dimensions based on the nominal size.

Standard 1 x Lumber

width="312">Actual Size (inches) width="312">¾  x 1 ½ width="312">¾ x 2 ½ width="312">¾ x 3 ½ width="312">1 x 6 width="312">1 x 8 width="312">1 x 10 width="312">1 x 12
>Nominal Size (inches)

>1 x 2

>1 x 3

>1 x 4

>¾ x 5 ½

>¾ x 7 ¼

>¾ x 9 ¼

>¾ x 11 ¼

 

Standard 2 x Lumber

width="312">Actual Size (inches) width="312">1 ½  x 1 ½ width="312">1 ½ x 2 ½ width="312">1 ½ x 3 ½ width="312">2 x 6 width="312">2 x 8 width="312">2 x 10 width="312">2 x 12
>Nominal Size (inches)

>2 x 2

>2 x 3

>2 x 4

>1 ½ x 5 ½

>1 ½ x 7 ¼

>1 ½ x 9 ¼

>1 ½ x 11 ¼

 

Standard 3 x Lumber

width="312">Actual Size (inches) width="312">2 ½ x 2 ½ width="312">2 ½ x 3 ½ width="312">3 x 6 width="312">3 x 8 width="312">3 x 10 width="312">3 x 12
>Nominal Size (inches)

>3 x 3

>3 x 4

>2 ½ x 5 ½

>2 ½ x 7 ¼

>2 ½ x 9 ¼

>2 ½ x 11 ¼

 

Standard 4 x Lumber

width="312">Actual Size (inches) width="312">3 ½ x 3 ½ width="312">4 x 8 width="312">4 x 10 width="312">4 x 12
>Nominal Size (inches)

>4 x 4

>4 x 6

>3 ½ x 5 ½

>3 ½ x 7 ¼

>3 ½ x 9 ¼

>3 ½ x 11 ¼

Let me know if you have any questions and I’ll get back to you as soon as possible.

 

 

 

 

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