Dimension lumber (2" to 4")

3x3

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

Dimensions

Depthd
2.5in
Widthb
2.5in

Mass and area

Cross-sectional areaA
6.25in²
Outside perimeterP
10in

Strong axis x–x

Moment of inertiaIx
3.255in⁴
Elastic section modulusSx
2.604in³
Plastic section modulusZx
3.906in³
Radius of gyrationrx
0.7217in

Weak axis y–y

Moment of inertiaIy
3.255in⁴
Elastic section modulusSy
2.604in³
Plastic section modulusZy
3.906in³
Radius of gyrationry
0.7217in

Torsion and stability

Torsional constantJ
5.501in⁴

Equivalents in other standards