Overview
- Primary topic
- Glass weight calculator
- Engineering basis
- kg/m2
- Review status
- Project-specific verification required
Why Glass Weight Matters
Glass weight affects dead load assumptions, frame reactions, brackets, fixings, handling, transport, and installation planning. It also feeds into wider structural glazing review.
Glass Weight Formula
Glass mass equals density multiplied by the volume of glass: m = ρV. For a rectangular pane, volume is width multiplied by height multiplied by glass thickness, with all dimensions converted to metres. Using a glass density of approximately 2,500 kg/m³ gives the familiar estimate of 2.5 kg/m² for each millimetre of glass thickness.
Calculation Basis
Common Monolithic Glass Weights
Using the 2.5 kg/m² per millimetre basis: 4 mm glass is about 10 kg/m², 6 mm is 15 kg/m², 8 mm is 20 kg/m², 10 mm is 25 kg/m², 12 mm is 30 kg/m² and 19 mm is 47.5 kg/m².
Tempered and Laminated Glass
Tempered glass of the same thickness is normally estimated with the same density basis. Laminated glass weight should include both glass plies and any relevant interlayer allowance.
DGU Glass Weight
For DGU glass, review the weight of both panes and the overall build-up. The cavity affects thermal and load-sharing behavior, while the glass panes normally control most of the dead load.
Engineering Use
From Mass to Dead Load
Convert mass to force using gravitational acceleration. VitraLab reports dead load in force-per-area and total-force units alongside kg/m² and total pane mass so the selected result can be used consistently.
Using VitraLab
Open the glass weight calculator to enter pane dimensions and build-up, then review kg/m², total pane mass, dead load and any selected interlayer allowance.
Frequently Asked Questions
What is the basic glass weight rule of thumb?
A common estimate is about 2.5 kg/m2 for each millimetre of glass thickness.
How do I estimate laminated glass weight?
Add the glass ply thicknesses together, apply the glass density estimate, and include any project-specific interlayer allowance where needed.
How is DGU glass weight reviewed?
For a DGU, review the glass panes in the build-up and include project-specific allowances where required. The cavity itself is usually not the main contributor to glass dead load.
Does glass weight replace a structural check?
No. Weight is only one input. Stress, deflection, support condition, load combinations, fixings, and project requirements still need to be reviewed.
Engineering content is prepared and maintained by VitraLab Engineering. Worked examples show how the current calculator treats a defined case; they do not replace project-specific verification.