Weights of metal stock

I found these weights online... could someone confirm they are close to accurate.

Mild steel tubing:
1.5" x 0.120": 1.8#/ft.
1.5" x 0.188": 2.6#/ft.
1.75" x 0.120": 2.0#/ft.
1.75" x 0.188": 3.1#/ft.
2.0" x 0.188": 3.6#/ft.
2.0" x 0.250": 4.7#/ft.
2.0" x 0.500": 8.0#/ft.

Mild steel plate:
0.120": 5.0#/sq. ft.
0.188": 7.7#/sq. ft.
0.250": 10.2#/sq. ft.
0.313": 12.75#/sq. ft.
0.375": 15.3#/sq. ft.

I did a couple and it looks about right. Check this calculator out, it does for all kinds of shapes and materials: http://www.mesteel.com/cgi-bin/w3-msql/goto.htm?url=http://www.mesteel.com/info/conversion.htm