Calculate LDPE weight for sheets, rods, or tubes, reverse-solve sheet thickness, convert units, and estimate purchase allowance, cost, and density sensitivity.

Uniform solid LDPE.

Estimate only: fillers, tolerances and voids affect actual weight.

Nominal assumption; replace with supplier density.

Optional settings

Blank means 0%. Added to net weight.

Optional. Blank omits cost.

LDPE Weight Formulas

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

LDPE Flat Sheet Weight Formula = L * W * T * d

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

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

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

LDPE Square Angle Weight Formula = (2*W*T – T^2) * L * d

LDPE T bar Weight Formula = (W*T + (H-T)*T)* L * d

LDPE C Channel Weight Formula = (2*W*T1 + (H-2*T1)*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 calculator converts each dimension to meters and uses density in kg/m³. Select sheet, solid round rod, round tube, or reverse-solve sheet thickness from net weight. The additional cross-section formulas above can be used separately with consistent units. Purchase allowance is added to net weight; an optional USD/kg price estimates material cost.

What is the density of LDPE?

A nominal density of 920 kg/m³ (0.920 g/cm³) is used by default, consistent with the typical value for Dow LDPE 690. Density varies by grade; use your supplier’s data. The ±5% outputs are illustrative sensitivity scenarios, not a grade specification or tolerance.