Laminated Glass Design Calculator

Interlayer thickness from impact and sound requirements.

Glass ply 1 (mm)

Glass ply 2 (mm)

Interlayer layers

Interlayer type

Panel width (mm)

Panel height (mm)

Tab to move between fields

Total thickness (mm)

8.76

Interlayer thickness (mm)0.76

Equiv. thickness for deflection (mm)5.04

Equiv. thickness for stress (mm)5.66

Panel weight (kg)31.25

STC rating (estimate)37

UV blocking (%)99

Meets CPSC 16 CFR 12011

Impact CategoryCat II (>9 ft²)

How to Use This Calculator

Enter Glass Ply 1 and Ply 2 thicknesses in mm and the number of Interlayer Layers.
Select the Interlayer Type: standard PVB, acoustic PVB, or SGP (SentryGlas).
Enter Panel Width and Height in mm.
Review Total Thickness, Equivalent Thickness for deflection, and Panel Weight in kg.
Check STC Rating estimate, UV Blocking percentage, and Impact Standard compliance.

How the result changes with Glass ply 1 (mm)

Glass ply 1 (mm): Thickness of first (outer) glass ply.
Glass ply 2 (mm): Thickness of second (inner) glass ply.
Interlayer layers: Number of interlayer sheets (each PVB = 0.38 mm, SGP = 0.89 mm).
Interlayer type: 0 = PVB standard, 1 = PVB acoustic, 2 = SGP (SentryGlas).
Panel width (mm): Width of the laminated panel.
Panel height (mm): Height of the laminated panel.

Total thickness (mm): Overall laminate thickness including glass plies and interlayer.
Interlayer thickness (mm): Combined interlayer thickness.
Equiv. thickness for deflection (mm): Effective monolithic thickness for deflection calculations (depends on interlayer coupling).
Equiv. thickness for stress (mm): Effective thickness for stress calculations on ply 1.
Panel weight (kg): Total weight including glass and interlayer.
STC rating (estimate): Estimated Sound Transmission Class rating.
UV blocking (%): Percentage of UV radiation blocked by interlayer.
Meets CPSC 16 CFR 1201: 1 = likely meets impact safety standard, 0 = may not meet.

Identify Input Parameters
4 parameters
Glass ply 1 (mm) = 4, Glass ply 2 (mm) = 4, Interlayer layers = 2, Interlayer type = 0 = 6 input(s) provided
Calculate Total thickness
Total thickness = ply1Mm + ply2Mm + interlayerThicknessMm
8.76 = 8.76
Calculate Interlayer thickness
0.76 = 0.76
Calculate Equiv. thickness for deflection
Equiv. thickness for deflection = pow(
5.04 = 5.04