Dimension lumber (2" to 4")

3x4

Standard: DOC PS 20 / NDS SupplementSource: Nominal → actual dry sizes (PS 20), calculated
xyb = 2.5d = 3.5
Cross-section, to scaledimensions in inches

Dimensions

Depthd
3.5in
Widthb
2.5in

Mass and area

Cross-sectional areaA
8.75in²
Outside perimeterP
12in

Strong axis x–x

Moment of inertiaIx
8.932in⁴
Elastic section modulusSx
5.104in³
Plastic section modulusZx
7.656in³
Radius of gyrationrx
1.01in

Weak axis y–y

Moment of inertiaIy
4.557in⁴
Elastic section modulusSy
3.646in³
Plastic section modulusZy
5.469in³
Radius of gyrationry
0.7217in

Torsion and stability

Torsional constantJ
10.2in⁴

Equivalents in other standards