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

PET Weight Formulas

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

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

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

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

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

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

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

PET 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 PET?

The average density of PET is 0.049855663 lbs/in^3.