Glass Weight Calculator
Find the weight of glass panels from size and thickness using the 2.5 kg per m² per mm convention.
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What this tool does
Find the weight of glass panels from size and thickness using the 2.5 kg per m² per mm convention. Soda-lime float glass density is ≈2,500 kg/m³, which the glazing industry expresses as 2.5 kg per m² for every mm of thickness. Hardware, framing and coatings are not included.
How to use the Glass Weight Calculator
- Enter or select panel length in in.
- Enter or select panel width in in.
- Enter or select glass thickness.
- Enter or select number of panels.
- Read the calculated result; change any measurement to compare alternatives.
Formula
weight = area (m²) × thickness (mm) × 2.5 kg — the published glass-industry convention (soda-lime glass ≈ 2,500 kg/m³)
- glassL
- Panel length (in, before metric conversion)
- glassW
- Panel width (in, before metric conversion)
- thickMm
- Glass thickness
- panels
- Number of panels
Soda-lime float glass density is ≈2,500 kg/m³, which the glazing industry expresses as 2.5 kg per m² for every mm of thickness. Hardware, framing and coatings are not included.
Worked example
For glass weight calculator, the following measurements illustrate the exact method: Panel length: 48; Panel width: 36; Glass thickness: 3; Number of panels: 1.
Inputs
- Panel length48 in
- Panel width36 in
- Glass thickness3 mm
- Number of panels1
Result
- Glass weight18.43 lb
- Glass weight (kg)8.36 kg
- Panel area12 sq ft
- Weight per panel (lb)18.43
Results explained
- Glass weight
- Glass weight from the formula above, expressed in lb before metric conversion. Soda-lime float glass density is ≈2,500 kg/m³, which the glazing industry expresses as 2.5 kg per m² for every mm of thickness. Hardware, framing and coatings are not included.
- Glass weight (kg)
- Glass weight (kg) from the formula above. Soda-lime float glass density is ≈2,500 kg/m³, which the glazing industry expresses as 2.5 kg per m² for every mm of thickness. Hardware, framing and coatings are not included.
- Panel area
- Panel area from the formula above, expressed in sqft before metric conversion. Soda-lime float glass density is ≈2,500 kg/m³, which the glazing industry expresses as 2.5 kg per m² for every mm of thickness. Hardware, framing and coatings are not included.
- Weight per panel (lb)
- Weight per panel (lb) from the formula above. Soda-lime float glass density is ≈2,500 kg/m³, which the glazing industry expresses as 2.5 kg per m² for every mm of thickness. Hardware, framing and coatings are not included.
Frequently asked questions
2.5 kg per square metre per millimetre of thickness. A 1 m² pane of 6 mm glass weighs 15 kg (about 33 lb).
48 × 36 in is 1.11 m², so 1.11 × 10 mm × 2.5 kg = 27.8 kg ≈ 61 lb — a two-person lift, which is why thick shower glass needs hinges rated for the weight.
No — tempering is a heat treatment, not a material change. Laminated glass weighs slightly more per thickness because of the interlayer; the difference is small for planning.
About 6 mm (actual float thickness ≈ 5.9 mm). Common mappings: 1/8 in ≈ 3 mm, 3/16 ≈ 5 mm, 3/8 ≈ 10 mm, 1/2 ≈ 12 mm.
Hinges, brackets, suction-cup lifters and the wall structure all have weight ratings. Exceeding a hinge rating is the common failure in frameless shower doors.