For other sizes:
(OD sq - ID sq) x .2223 - weight PIW

For footage in coil:
weight PIW divided by weight per lineal foot

Weight per lineal ft:
thickness (decimals) x width x 3.4

Weight Blank:
decimal thick x width x .2833 x length (in inches)

To convert weights to stainless:
400 series above weight x 1.01
300 series: Above weight x 1.03

Footage per coil:
Weight per coil divided by weight per lineal foot.