Dimension lumber (2" to 4")

3x12

Standard: DOC PS 20 / NDS SupplementSource: Nominal → actual dry sizes (PS 20), calculated
xyb = 2.5d = 11.25
Cross-section, to scaledimensions in inches

Dimensions

Depthd
11.25in
Widthb
2.5in

Mass and area

Cross-sectional areaA
28.12in²
Outside perimeterP
27.5in

Strong axis x–x

Moment of inertiaIx
296.6in⁴
Elastic section modulusSx
52.73in³
Plastic section modulusZx
79.1in³
Radius of gyrationrx
3.248in

Weak axis y–y

Moment of inertiaIy
14.65in⁴
Elastic section modulusSy
11.72in³
Plastic section modulusZy
17.58in³
Radius of gyrationry
0.7217in

Torsion and stability

Torsional constantJ
50.39in⁴

Equivalents in other standards