Did you know that a 2×4 does not actually measure two by four inches?

If you’re new to carpentry and woodworking you may be surprised to learn that lumber today is actually smaller in both width and thickness than its listed size. That’s because the listed dimensions for lumber are based on the rough sawn thickness and width of the board as it comes out of the sawmill before it is planed to make it smooth and uniform in size.

To determine the actual size of planed lumber from the listed dimensions:

  • Thickness: The actual thickness of planed lumber is 1/4″ less for boards 1” in thickness, and 1/2″ less for boards 2″ and thicker. So the actual thickness of a 1” planed board will be 3/4″ while a 2” thick planed board will measure 1½” thick.
  • Width: The actual width of planed lumber is 1/2″ less for boards 6” wide or narrower, and 3/4″ less for boards over 6” wide. So the actual width of a 6” planed board will be 5½” while the actual width of a 10” planed board will be 9¼” wide.

Watch the video above to find out more.


Further Information

Editorial Contributors
avatar for Mitchell Layton

Mitchell Layton

Mitchell Layton is a former professional mover who currently lives in Philadelphia, Pennsylvania. Mitchell spent years packing and moving for REAL Rock N Roll Movers, a commercial and residential moving company based in Los Angeles that’s primarily staffed with up-and-coming musicians. That gave him plenty of experience navigating box trucks up and down the winding streets of LA. In addition to moving hundreds of happy customers into new homes and apartments all across Southern California, Mitchell has also performed corporate moves on company lots for Nickelodeon, Warner Bros, Universal Studios, Paramount, and more. After pouring blood, sweat, and tears into his profession, Mitchell has all the helpful tips you need for your next move.

Learn More