Polystyrene Weight Calculator

Calculate polystyrene weight from sheet, cylinder or volume measurements using EPS, XPS or custom density and show results in kg, g and lb.

Pick the polystyrene type, enter the dimensions, and get the weight.

Sheet / Board

Round / Cylinder

By Volume

Polystyrene type Length

Width

Thickness

Please fill in all dimensions.

Polystyrene type Diameter

Length

Please enter diameter and length.

Polystyrene type Volume

Please enter a volume.

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Polystyrene Weight Formulas

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

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

Polystyrene Round Bar Weight Formula = (π/4) * D² * L * d

Polystyrene Square Hollow Tube Weight Formula = [W²-(W-2T)²] * L * d

Polystyrene Round Hollow Tube Weight Formula = (π/4) * (D_o² - D_i²) * L * d

Polystyrene Square Angle Weight Formula = (2*W*T - T²) * L * d

Polystyrene T Bar Weight Formula = (W*T1 + (H-T1)*T2) * L * d

Polystyrene 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 (or outer width / leg length / flange width, depending on shape)
H is the overall height/depth (for T bars and C channels)
T is the thickness (sheet thickness, wall thickness, or angle thickness)
d is the density
D is the diameter (round bar)
D_o is the outer diameter (round hollow tube)
D_i is the inner diameter (round hollow tube)
T1 is the flange thickness (for T bars and C channels)
T2 is the web thickness (for T bars and C channels)

This calculator converts all entered dimensions to inches internally and converts the entered density to lb/in³ internally. You can enter dimensions in inches, mm, cm, m, or ft, and you can enter density in lb/in³, kg/m³, or g/cm³. The result can be displayed in lb, kg, or g.

What is the density of Polystyrene?

Solid (general-purpose) polystyrene is typically about 1.04–1.06 g/cm³ (≈1040–1060 kg/m³, or ≈0.0376–0.0383 lb/in³). Expanded polystyrene (EPS) foams are much less dense (often on the order of ~10–50 kg/m³).