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Comparison of Column Areas

The carying capacity of a column is primarily based on the gross area of the cross sectional (assuming the same amount of steel is used).

Use the table below to determine what size round column to substitute for a square column.

 
SQUARE
Square Column
Size
(Inches)
Gross Area
(Sq. In.)
8 x 8 64
10 x 10 100
12 x 12 144
14 x 14 196
16 x 16 256
18 x 18 324
20 x 20 400
22 x 22 484
24 x 24 576
26 x 26 676
28 x 28 784
30 x 30 900
32 x 32 1024
34 x 34 1156
36 x 36 1296
42 x 42 1764
48 x 48 2304
ROUND
Round Column
Diameter
(Inches)
Gross Area
(Sq. In.)
8 50
10 79
12 113
14 154
16 201
18 254
20 314
22 380
24 452
26 531
28 616
30 707
32 804
34 908
36 1018
42 1385
48 1810