How much does glass weigh per square metre?

Glass weighs 2.5 kg per square metre per millimetre of thickness. So 4mm glass weighs 10 kg/m², 6mm weighs 15 kg/m², 10mm weighs 25 kg/m², and so on. This applies to all types of soda-lime glass (float, toughened, patterned). Laminated glass weighs slightly less due to the PVB interlayer but the difference is negligible for practical purposes.

What is the maximum weight one person can carry glass?

Under the HSE Manual Handling Operations Regulations 1992, the general guideline for repetitive lifting is approximately 25 kg for a single person and 50 kg for two people. However, glass handling involves additional risks (fragility, sharp edges, awkward shape) so lower limits and mechanical aids are recommended. Always use suction cups and cut-resistant gloves.

Is toughened glass heavier than float glass?

No. Toughened (tempered) glass has the same density as float glass at 2,500 kg/m³. The toughening process (heating and rapid cooling) changes the internal stress pattern but not the weight. The only glass types with slightly different weights are laminated glass (marginally lighter due to PVB interlayer) and specialist glasses like borosilicate.

How do I calculate DGU weight?

For a double glazed unit, calculate each pane weight separately and add them together. The gas fill (air, argon, krypton) between panes adds negligible weight. For example, a 4/16/4 DGU measuring 1m x 1m: Pane 1 = 10 kg + Pane 2 = 10 kg = 20 kg total. Use the dedicated DGU calculator for sealed unit specifications.

What suction cups do I need for glass handling?

For panes up to 25 kg, a single heavy-duty suction cup (rated 50 kg+) is adequate. For panes 25-50 kg, use dual suction cups. Over 50 kg, use a vacuum lifter frame with multiple cups rated appropriately. Always check suction cups for damage before each use and never rely on suction cups as the sole means of support during overhead glazing.

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Glass Weight Calculator — Pane Weight & Handling Assessment

Calculate glass weight by type and thickness for handling assessments and structural loading. Includes HSE manual handling guidance for glazing work.

Glass Type

All soda-lime glass has the same density

Glass Thickness

Select thickness or laminated make-up

Pane Width

Width of glass pane (not frame)

Pane Height

Height of glass pane

Number of Panes

Total panes of this size

How We Calculate This

This calculator determines glass weight from dimensions, thickness and type using the standard glass density.

The formula

Weight (kg) = Width (m) × Height (m) × Thickness (m) × 2,500 kg/m³

Simplified: Weight (kg/m²) = Thickness (mm) × 2.5

Quick reference weights per m²

4mm glass = 10 kg/m²
6mm glass = 15 kg/m²
8mm glass = 20 kg/m²
10mm glass = 25 kg/m²
12mm glass = 30 kg/m²
19mm glass = 47.5 kg/m²

Handling categories

Based on HSE Manual Handling Operations Regulations 1992 guidance, adapted for glazing work.

Frequently Asked Questions

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Last updated: March 2026

All calculations are estimates. Verify with your supplier.