Structural Lumber  Section Sizes
Basic size, area, moments of inertia and section modulus for timber  metric units.
Size  Area  Section Modulus  Area Moment of Inertia  Radius of Gyration  

S_{xx}  S_{yy}  I_{xx}  I_{yy}  r_{xx}  r_{yy}  
(mm x mm)  (10^{2} mm^{2})  (10^{3} mm^{3})  (10^{3} mm^{3})  (10^{6} mm^{4})  (10^{6} mm^{4})  (mm)  (mm) 
100 x 38  38  63.3  24.1  3.17  0.46  28.9  11.0 
100 x 50  50  83.3  41.7  4.17  1.04  28.9  14.4 
100 x 63  63  105  66.2  5.25  2.08  28.9  18.2 
100 x 75  75  125  93.8  6.25  3.52  28.9  21.7 
100 x 100  100  167  167  8.33  8.33  28.9  28.9 
150 x 38  57  143  36.1  10.7  0.69  43.3  11.0 
150 x 50  75  188  62.5  14.1  1.56  43.3  14.4 
150 x 63  94  236  99.2  17.7  3.13  43.3  18.2 
150 x 75  112  281  141  21.1  5.27  43.3  21.7 
150 x 100  150  375  250  28.1  12.5  43.3  28.9 
150 x 150  225  563  563  42.2  42.2  43.3  43.3 
175 x 38  66  194  42.1  17.0  0.80  50.5  11.0 
175 x 50  87  255  72.9  22.3  1.82  50.5  14.4 
175 x 63  110  322  116  28.1  3.65  50.5  18.2 
175 x 75  131  383  164  33.5  6.15  50.5  21.7 
200 x 38  76  253  48.1  25.3  0.91  57.7  11.0 
200 x 50  100  333  83.3  33.3  2.08  57.7  14.4 
200 x 63  126  420  132  42.0  4.17  57.7  18.2 
200 x 75  150  500  188  50.0  7.03  57.7  21.7 
200 x 100  200  667  333  66.7  16.7  57.7  28.9 
200 x 150  300  1000  750  100  56.3  57.7  43.3 
200 x 200  400  1333  1333  133  133  57.7  57.7 
225 x 38  85  321  54.2  36.1  1.03  65.0  11.0 
225 x 50  112  422  93.8  47.5  2.34  65.0  14.4 
225 x 63  141  532  149  59.8  4.69  65.0  18.2 
225 x 75  168  633  211  71.2  7.91  65.0  21.7 
250 x 50  125  521  104  65.1  2.60  72.2  14.4 
250 x 75  187  781  234  97.7  8.79  72.2  21.7 
250 x 100  250  1042  417  130  20.8  72.2  28.9 
250 x 250  625  2604  2604  326  326  72.2  72.2 
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