6x6 Actual Size
Find the actual thickness, width, and metric dimensions of a standard 6x6 lumber post.
6x6 Actual Dimensions
| Measurement | Actual Size |
|---|---|
| Nominal Size | 6 × 6 inches |
| Actual Thickness | 5.5 inches |
| Actual Width | 5.5 inches |
| Metric Size | 140 × 140 mm |
What Is the Actual Size of a 6x6?
A commonly sold dry 6x6 post has an actual finished size of approximately 5.5 inches thick × 5.5 inches wide.
The name 6x6 refers to the nominal size of the lumber rather than its final finished dimensions.
Why Is a 6x6 Not Actually 6 by 6 Inches?
Lumber is typically cut larger than its final dimensions and then dried and surfaced. Planing and finishing reduce the dimensions, which is why a nominal 6x6 is commonly about 5.5 × 5.5 inches after finishing.
6x6 Size in Millimeters
The commonly referenced metric dimensions are approximately 140 × 140 mm.
Actual dimensions can vary depending on lumber grade, moisture condition, manufacturer, and product specifications.
Common Uses for 6x6 Lumber
6x6 lumber is commonly used for structural posts, deck supports, timber structures, landscaping, pergolas, and other construction applications requiring a larger post.
Related Lumber Sizes
FAQ
How thick is a 6x6?
A commonly sold dry 6x6 is about 5.5 inches thick.
How wide is a 6x6?
A commonly sold dry 6x6 is about 5.5 inches wide.
What is a 6x6 in millimeters?
The commonly referenced metric size is approximately 140 × 140 mm.