Glass configuration

Glass dimensions Calculated

Width (inches)

Height (inches)

Enter the overall lite dimensions. For an IGU, this is the overall unit size.

Quantity (number of units)

Glass configuration

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Monolithic

Single lite of glass, annealed, HS, or tempered

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Laminated

Two glass lites bonded with interlayer (PVB or SGP)

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Double IGU

Two monolithic lites with sealed gas cavity

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Double IGU, laminated

One laminated lite + one monolithic, sealed cavity

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Double IGU, both laminated

Both lites are laminated (4 glass plies total)

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Triple IGU

Three monolithic lites, two sealed gas cavities

Standard glass weights (per lite, per unit area)

3mm (⅛")	7.5 kg/m² · 1.53 lb/ft²
5mm (3/16")	12.5 kg/m² · 2.56 lb/ft²
6mm (¼")	15.0 kg/m² · 3.07 lb/ft²
8mm (5/16")	20.0 kg/m² · 4.10 lb/ft²
10mm (⅜")	25.0 kg/m² · 5.12 lb/ft²
12mm (½")	30.0 kg/m² · 6.14 lb/ft²
15mm (⅝")	37.5 kg/m² · 7.68 lb/ft²
19mm (¾")	47.5 kg/m² · 9.73 lb/ft²
25mm (1")	62.5 kg/m² · 12.8 lb/ft²

Basis: float glass density 2.5 g/cm³ (GANA standard). Laminated, coated, and heat-treated glass of the same nominal thickness weigh the same to within <1%.

Weight per unit

lb per unit

, kg

Disclaimer & limitations:
Glass lite weights are calculated from the standard float glass density of 2.5 g/cm³ (GANA Glass Handbook). This is the accepted industry basis and applies equally to annealed, heat-strengthened, tempered, and soft-coat coated glass.

Interlayer weights use standard published densities (PVB 1.07 g/cm³, SGP ~0.89 g/cm³).

Spacer bar and sealant weights are estimates based on typical aluminum box spacer (~0.05 kg/m) and combined PIB + silicone secondary seal (~0.18 kg/m of perimeter). Actual values vary by spacer system, sealant bite depth, and product. These components typically add 1–4% to total IGU weight.

Do not use these results for structural engineering calculations or certified shipping manifests. Verify actual weights with your glass fabricator or supplier before use in load design, handling equipment selection, or freight documentation.

Glass Weight Calculator