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Structural Lumber - Properties

Properties of structural lumber.

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Timber Structural Properties - Metric units

Nominal Dimension (in)	Actual Dimension (in)	Area (in²)	Section Modulus - S - (in³)	Moment of Inertia - I - (in⁴)	Weight (lb/ft)
1 x 3	0.75 x 2.5	1.875			0.47
1x 4	0.75 x 3.5	2.625			0.64
1 x 6	0.75 x 5.5	4.125			1.0
1 x 8	0.75 x 7.25	5.4375			1.3
1 x 10	0.75 x 9.25	6.9375			1.7
1 x 12	0.75 x 11.25	8.4375			2.1
2 x 3	1.5 x 2.5	3.75	1.56	1.95	0.9
2 x 4	1.5 x 3.5	5.25	3.06	5.36	1.3
2 x 6	1.5 x 5.5	8.25	7.56	20.8	2.0
2 x 8	1.5 x 7.25	10.875	13.1	47.6	2.6
2 x 10	1.5 x 9.25	13.875	21.4	98.9	3.4
2 x 12	1.5 x 11.25	16.875	31.6	178	4.1
3 x 2	2.5 x 1.5	3.75	0.94	0.70	0.9
3 x 4	2.5 x 3.5	8.75	5.10	8.93	2.1
3 x 6	2.5 x 5.5	13.75	12.6	34.7	3.3
3 x 8	2.5 x 7.25	18.125	21.9	79.4	4.4
3 x 10	2.5 x 9.25	23.125	35.7	165	5.6
3 x 12	2.5 x 11.25	28.125	52.7	297	6.8
4 x 2	3.5 x 1.5	5.25	1.31	0.98	1.3
4 x 3	3.5 x 2.5	8.75	3.64	4.56	2.1
4 x 4	3.5 x 3.5	12.25	7.15	12.5	3.0
4 x 6	3.5 x 5.5	19.25	17.6	48.5	4.7
4 x 8	3.5 x 7.25	25.375	30.7	111	6.2
4 x 10	3.5 x 9.25	32.375	49.9	231	7.9
4 x 12	3.5 x 11.25	39.375	73.8	415	9.6
6 x 2	5.5 x 1.5	8.25	2.1	1.55	2.0
6 x 3	5.5 x 2.5	13.8	5.7	7.16	3.3
6 x 4	5.5 x 3.5	19.3	11.2	19.7	4.7
6 x 6	5.5 x 5.5	30.3	27.7	76.3	7.4
6 x 8	5.5 x 7.5	41.3	51.6	193	10.0
6 x 10	5.5 x 9.5	52.3	82.7	393	12.7
6 x 12	5.5 x 11.5	63.3	121	697	15.4
8 x 2	7.25 x 1.5	10.9	2.7	2.04	2.6
8 x 3	7.25 x 2.5	18.1	7.6	9.44	4.4
8 x 4	7.25 x 3.5	25.4	14.8	25.9	6.2
8 x 6	7.5 x 5.5	41.3	37.8	104	10.0
8 x 8	7.5 x 7.5	56.3	70.3	264	13.7
8 x 10	7.5 x 9.5	71.3	113	536	17.3
8 x 12	7.5 x 11.5	86.3	165	951	21.0
8 x 14	7.5 x 13.5	101	228	1538	24.6
8 x 16	7.5 x 15.5	116	300	2327	28.3
10 x 10	9.5 x 9.5	90.3	143	679	21.9
10 x 12	9.5 x 11.5	109	209	1204	26.6
10 x 14	9.5 x 13.5	128	289	1948	31.2
10 x 16	9.5 x 15.5	147	380	2948	35.8
10 x 18	9.5 x 17.5	166	485	4243	40.4
12 x 12	11.5 x 11.5	132			32.1
12 x 14	11.5 x 13.5	152			37.7
12 x 16	11.5 x 15.5	178			43.3

1 in = 25.4 mm
1 in² = 6.45x10² mm²
1 in³ = 1.64x10⁴ mm³
1 in⁴ = 4.16x10⁵ mm⁴
1 lb/ft = 1.49 kg/m

Based on standard commercially available lumber within the USA.

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