# Calculating Weight of Solids, Tubing & Circles

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 D^{2}

Pounds per lineal inch = .22274 x D^{2}

D = Diameter in inches

To compute the weight of a square bar:

Pounds per lineal foot = 3.4032 x L^{2}

Pounds per lineal inch = .2836 x L^{2}

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 D^{2}

Pounds per lineal inch = .2456 x D^{2}

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 D^{2}

Pounds per lineal inch = .23494 x D^{2}

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

Lead - 1.448

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. .