2x10 actual size
Dry (19% moisture or less)
1-1/2 × 9-1/4 in
38.1 × 235 mm
From the standard, NIST PS 20-25
Nominal, dry and green
| Size | Thickness | Width |
|---|---|---|
| Nominal (the name) | 2 in | 10 in |
| Dry, minimum | 1-1/2 in (38.1 mm) | 9-1/4 in (235 mm) |
| Green, minimum | 1-9/16 in (39.7 mm) | 9-1/2 in (241.3 mm) |
A 2x10 is dimension lumber (2 in to under 5 in nominal thickness) under the American Softwood Lumber Standard, NIST PS 20-25. The standard names lumber by its nominal size and sets the smallest it may be once it has been dressed (planed smooth). Lumber dried to 19% moisture content or less is held to the dry size; lumber surfaced green, above 19%, is left a little bigger because it shrinks as it dries.
Board feet in a 2x10
Thickness × width ÷ 12 gives the board feet in each foot of length. By the nominal size that is 1.667 bd ft per foot; by the dry dressed size it is 1.156. Ask your yard which one it prices on.
| Length | Nominal bd ft | Actual (dry) bd ft |
|---|---|---|
| 8 ft | 13.33 | 9.25 |
| 10 ft | 16.67 | 11.56 |
| 12 ft | 20 | 13.88 |
| 16 ft | 26.67 | 18.5 |
For a whole order, use the board foot calculator. Every size side by side is on the lumber sizes chart.
Sources
- NIST (US Department of Commerce), Voluntary Product Standard PS 20-25, American Softwood Lumber Standard, Table 3 (effective January 2025), read 2026-11-07
- Engineering ToolBox, Softwood lumber: nominal and actual (dry) sizes, read 2026-11-07
- WoodBin, Standard dimensions of lumber (hardwood thickness after G. Wengert; softwood dry and green sizes), read 2026-11-07