Dimensional lumber: actual sizes of 1x2 to 6x6, 8 to 16 ft (2x4 = 1-1/2 × 3-1/2 in) — dimension sheet
Source: Xem Studio, https://xemstudio.com/objects/dimensional-lumber/  (CC BY 4.0)
Basis: US softwood lumber standard (DOC PS 20), dry dressed sizes: nominal 1 in = 3/4 in, 2 in = 1-1/2 in, 4 in = 3-1/2 in; widths to 6 in lose 1/2 in, 8 in and up lose 3/4 in
Catalog version: 2026-10-20

Sizes: see table below
- Drawn square-edged at the dressed size; real boards have eased (rounded) edges about 1/8 in.
- Pre-cut studs: 92-5/8 in (with a bottom plate and a double top plate makes an 8 ft wall) and 104-5/8 in (9 ft).

nominal  thickness_in  width_in  thickness_mm  width_mm
1x2  3/4  1-1/2  19.0  38.1
1x3  3/4  2-1/2  19.0  63.5
1x4  3/4  3-1/2  19.0  88.9
1x6  3/4  5-1/2  19.0  139.7
1x8  3/4  7-1/4  19.0  184.1
1x10  3/4  9-1/4  19.0  234.9
1x12  3/4  11-1/4  19.0  285.8
2x2  1-1/2  1-1/2  38.1  38.1
2x3  1-1/2  2-1/2  38.1  63.5
2x4  1-1/2  3-1/2  38.1  88.9
2x6  1-1/2  5-1/2  38.1  139.7
2x8  1-1/2  7-1/4  38.1  184.1
2x10  1-1/2  9-1/4  38.1  234.9
2x12  1-1/2  11-1/4  38.1  285.8
4x4  3-1/2  3-1/2  88.9  88.9
4x6  3-1/2  5-1/2  88.9  139.7
6x6  5-1/2  5-1/2  139.7  139.7

Files elsewhere (not hosted by Xem Studio; license as stated by the publisher):
- NIST / ALSC: Voluntary Product Standard DOC PS 20, American Softwood Lumber Standard — standard — NIST / ALSC; dimensions are facts [verify license at link] — https://www.alsc.org/

Free files (CC BY 4.0, Xem Studio; STEP + STL, 72 parts): https://xemstudio.com/files/hardware/dimensional-lumber/index.json
API: https://xemstudio.com/api/geometry?object=dimensional-lumber