About 2x4ActualSize.com

2x4ActualSize.com is a simple reference site that answers one question really well: what are the real (actual) dimensions of common lumber sizes? We publish clear, fast answers for 2x4s, 2x6s, 4x4s, and more, in inches, millimeters, and centimeters.

Our Mission

Make lumber dimensions easy. No fluff, no hunting through forums. Just accurate sizes, quick conversions, and short explanations you can trust.

What “actual size” means

In North American construction, a “2×4” is the nominal label. After drying and planing, the actual finished size is smaller: 1.5 inches by 3.5 inches (38 mm by 89 mm). We apply this same nominal vs actual concept across all common boards.

How we verify measurements

• Use the standard U.S./Canada surfaced framing sizes (kiln dried, surfaced on four sides).
• Convert inches to millimeters using 25.4 mm per inch, and to centimeters by dividing mm by 10.
• Round metric values to the nearest whole mm or two decimals for cm when appropriate.
• Note exceptions such as rough sawn, green, or specialty lumber that can differ slightly.

Editorial standards

• Accuracy first: Pages show the actual size up top, with a short table and plain language.
• Evergreen content: Lumber sizes do not change often; we keep pages stable and review them periodically.
• Clarity: We avoid jargon and keep pages scannable for DIYers and pros alike.

Who we are

We are a small team of builders and DIY researchers who love clean, useful reference pages. We are not a lumber retailer. We do this so your next cut fits the first time.

When sizes can vary

Actual sizes are standardized, but minor variation can occur due to mill tolerances and moisture content. Pressure treated boards can shrink as they dry. Rough sawn or specialty products may be closer to nominal dimensions. Always measure the board you will actually use when precision matters.

Popular pages

• 2×4 actual size (home)
• 2×4 dimensions
• 2×4 width
• 2×6 actual size
• 4×4 actual size
• 2×4 in mm and 2×4 in cm

Contact

Spotted an error or want a size we have not covered yet? Send a note to: hello [at] 2x4actualsize.com (replace [at] with @).

Disclaimer

Information on this site is for general reference. Building codes and material specs can vary by region, supplier, and product line. Always verify critical measurements on the actual board before cutting or fastening.

Last updated: April 2025