Select the shape of the Polystyrene and enter the required variables. The calculator will evaluate and display the Polystyrene weight.

## Polystyrene Weight Formulas

The following formulas are used to calculate the weight of Polystyrene in different shapes.

Polystyrene Flat Sheet Weight Formula = L * W * H * d

Polystyrene Round Bar Weight Formula = pi * D^2/4 * L * d

Polystyrene Square Hollow Tube Weight Formula = [W^2-(W-T)^2] * L * d

Polystyrene Round Hollow Tube Weight Formula = pi * (R^2-r^2) * L * d

Polystyrene Square Angle Weight Formula = [W^2-(W-T)^2]/2 * L * d

Polystyrene T bar Weight Formula = (W*T – (H-T)*T)* L * d

Polystyrene C Channel Weight Formula = (2*W*T1+H*T2)* L * d

Variables used in these equations:

- L is the length
- W is the width
- H is the height
- d is the density
- D is the outer diameter
- T is the thickness
- R is the outer radius
- r is the inner radius
- T1 is the channel thickness along the width
- T2 is the channel thickness along the height

The units used in all calculations on the calculator are inches for lengths and lbs/in^3 for density. These can be switched for any equivalent unit as long as the density units are also changed to match. For example, if you change the lengths to feet, the density should be in lbs/ft^3 or mass/ft^3.

## What is the density of Polystyrene?

The average density of Polystyrene is 0.000590277778 lbs/in^3.