Glass Weight Estimator
Glass panel weight in kg and lb from length, width, thickness and panel count, at 2.50 g/cm³ for float glass types, or acrylic and polycarbonate sheet. How it works
Use the Glass Weight Estimator
About the Glass Weight Estimator
A 100 × 80 cm pane of 6 mm annealed glass weighs 12.00 kg (26.46 lb). The glass weight estimator multiplies length × width × thickness by a density of 2.50 g/cm³, so every millimeter of thickness adds 2.5 kg per square meter: 6 mm glass is 15.0 kg/m² and 10 mm glass is 25.0 kg/m². Acrylic and polycarbonate sheet are weighed at 1.19 and 1.20 g/cm³, so the same 100 × 80 cm, 6 mm sheet is 5.71 kg in acrylic and 5.76 kg in polycarbonate.
Weight of 1 m² of glass by thickness
| Thickness | Weight of 1 m² | In pounds |
|---|---|---|
| 3 mm | 7.5 kg | 16.5 lb |
| 4 mm | 10.0 kg | 22.0 lb |
| 5 mm | 12.5 kg | 27.6 lb |
| 6 mm | 15.0 kg | 33.1 lb |
| 8 mm | 20.0 kg | 44.1 lb |
| 10 mm | 25.0 kg | 55.1 lb |
| 12 mm | 30.0 kg | 66.1 lb |
| 15 mm | 37.5 kg | 82.7 lb |
| 19 mm | 47.5 kg | 104.7 lb |
At the tool’s 2.50 g/cm³: each millimeter adds 2.5 kg per square meter. The same figure applies to every glass type the tool offers, including laminated. Acrylic (1.19 g/cm³) and polycarbonate (1.20 g/cm³) weigh a little under half as much.
Weight of single panels
| Length × width × thickness | Weight | In pounds |
|---|---|---|
| 100 × 80 cm × 6 mm | 12.0 kg | 26.5 lb |
| 120 × 60 cm × 4 mm | 7.2 kg | 15.9 lb |
| 210 × 90 cm × 8 mm | 37.8 kg | 83.3 lb |
| 200 × 100 cm × 10 mm | 50.0 kg | 110.2 lb |
| 300 × 200 cm × 12 mm | 180.0 kg | 396.8 lb |
One panel each, 2.50 g/cm³. The last one is over the tool’s 100 kg heavy-panel warning.
How to use this tool
- Choose metric (cm and mm) or imperial (inches).
- Enter the length, width and thickness, pick a glass type (or acrylic or polycarbonate sheet) and enter the number of panels, from 1 to 100.
- Read the weight per panel and for all panels in kg, lb and g, plus the volume. A warning appears when the total is over 100 kg.
Frequently asked questions
- How much does a square meter of glass weigh?
- 2.5 kg for every millimeter of thickness at the tool’s density: 7.5 kg for 3 mm, 12.5 kg for 5 mm, 15.0 kg for 6 mm, 25.0 kg for 10 mm and 47.5 kg for 19 mm. In pounds, 6 mm glass is 33.1 lb per square meter.
- How do I work out glass weight in pounds from inches?
- Switch to imperial and enter inches. A 36 × 48 in pane of 1/4 in (0.25) glass is 7,079 cm³ and weighs 17.70 kg, or 39.02 lb. The tool converts each inch to 2.54 cm, multiplies by 2.50 g/cm³ and divides by 453.592 g per pound.
- Does laminated or tempered glass weigh more?
- Tempered glass has the same composition and weight as annealed. The tool also weighs laminated glass at 2.50 g/cm³, which is the cautious choice, because the PVB interlayer, about 1.07 g/cm³ on a manufacturer’s data page, makes a laminate lighter. A 6.38 mm laminate made of 5.62 mm of glass and a 0.76 mm interlayer averages 2.33 g/cm³, so a 100 × 80 cm sheet is 11.89 kg instead of the 12.76 kg the tool shows, about 7% less.
- What density does glass have?
- The tool uses 2.50 g/cm³ for all six glass types. A page on soda-lime float glass from Valley Design lists 2.44 g/cm³ at 20 °C, which would make the 100 × 80 cm, 6 mm pane 11.71 kg instead of 12.00 kg, 2.4% lighter. Use 2.50 for an estimate and a supplier’s data sheet for a figure you rely on.
- How much does acrylic or polycarbonate sheet weigh?
- About half as much as glass. The tool uses 1.19 g/cm³ for acrylic (PMMA, sold as Plexiglas or Perspex) and 1.20 g/cm³ for polycarbonate (Lexan, Makrolon), the figures on Emco Plastics data pages for Plexiglas G and Makrolon UC sheet. A 100 × 80 cm sheet 6 mm thick is 5.71 kg in acrylic and 5.76 kg in polycarbonate against 12.00 kg in glass, and a 4 × 8 ft sheet 1/4 in thick is 49.53 lb and 49.94 lb against 104.05 lb. Published ranges run 1.17 to 1.20 g/cm³ for acrylic and 1.20 to 1.22 g/cm³ for polycarbonate.
- When does the tool warn that glass is heavy?
- When the total weight of all panels is over 100 kg. One 300 × 200 cm panel of 12 mm glass weighs 180.0 kg (396.8 lb) and triggers it. The warning is a flag to plan handling and support, not a lifting guideline.
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