# Calculating Weight of Solids, Tubing & Circles

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It is often necessary to compute the weight of a metal. Steel bar weights are based upon .2836 pounds per cubic inch.

To compute the weight of a round bar.
Pounds per lineal foot = 2.6729 x D2
Pounds per lineal inch = .22274 x D2
D = Diameter in inches

To compute the weight of a square bar:
Pounds per lineal foot = 3.4032 x L2
Pounds per lineal inch = .2836 x L2
L = Length of one side in inches

To compute the weight of a flat bar:
Pounds per lineal foot = 3.4032 x W x T
Pounds per lineal inch = .2836 x W x T
W = Width in inches
T = Thickness in inches

To compute the weight of a hexagon bar:
Pounds per lineal foot = 2.9473 x D2
Pounds per lineal inch = .2456 x D2
D = Distance from one flat to opposite flat in inches

To compute the weight of an octagon bar:
Pounds per lineal foot = 2.8193 x D2
Pounds per lineal inch = .23494 x D2
D = Distance from one flat to opposite flat in inches

To compute the weight of round tubing:
Pounds per lineal foot = 10.68 x (OD-W) -W
Pounds per lineal inch = .89 x (OD-W) -W
OD = Outside diameter in inches
W = Wall thickness in inches

To compute the weight of a circle:
Pounds per piece = .22274 x T X D2
T = Thickness in inches
D = Diameter in inches

To compute the weight of a ring:
Pounds per piece = .22274 x T x (OD2 -ID2)
OD = Outside diameter in inches
ID = Inside diameter in inches
T = Thickness in inches

To compute the weight of the following metals multiply the weight of steel by the following factors:

*Aluminum - 0.346
Beryllium - 0.236
Brass - 1.084
Cast Iron - 0.911
Columbium - 1.095
Copper - 1.144
Gold - 2.466
Magnesium - 0.229
Molybdenum - 1.303
Monel - 1.084
Nickel - 1.137
St. Steel 300 - 1.010
St. Steel 400 - 1.000
Silver - 1.339
Tantalum - 2.120
Tin - 0.932
Titanium - 0.575
Tungsten - 2.462
Zinc - 0.911
Zirconium - 0.812

*Aluminum depends much upon which aluminum alloy. The multiplier of .346 is based upon 1100 Alloy and is a pretty good generalization for most grades. .