A 4x4 is a piece of lumber (wood) with an approximately 4 inch square cross-section. However, similar to other nominal dimensions, due to the milling and drying process, a nominal 4x4 board may actually measure slightly less, typically around 3.5 inches by 3.5 inches.

4x4s are commonly used in construction and woodworking for a variety of applications. They are often used for structural support in projects like building frames, fence posts, and other load-bearing elements. 4x4 lumber is known for its strength and stability, making it a popular choice for many outdoor and indoor construction projects.

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4x4 Price Survey

The 4x4 Lumber Pricing table contains recent lumber prices for pressure treated 4x4s of a variety of lengths with prices  from Lowes, Home Depot, Menards and potentially other stores based on their web sites.

Pressure Treated 4x4 Price Survey:

• 4x4 Price Survey Date: 7/28/25
• 4x4 Price Survey Store: Menards
• 4x4 Price by Length 
  • Price of a 4' 4x4: $9.39
  • Price of a 6' 4x4: $10.98
  • Price of an 8' 4x4: $11.98
  • Price of a 10' 4x4: $22.48

All prices are in U.S. dollars and based on searches of nationally advertised prices from the provider's web sites.   Search string: "4x4 lumber" is used in the retailer's website.  The term four by four (4x4) refers to the rough cut dimensions of construction grade lumber.  The typical 4x4 purchased at a lumber yard is actually `3 1/2`" x `3 1/2`".   Nonetheless, the term 4x4 persists. 

NOTE:  Local pricing should ALWAYS, ALWAYS, ALWAYS be used!  These price points are for estimation convenience only, and there is no guarantee on the prices of the product nor of their availability at the stated price.