The weight of double and triple glass units

The weight of glass plays big factor in architectural glazing. It is important factor when determining what type of hardware and frame profile is required for windows and doors. Glass weight also plays a important role in determining the number of people and appropriate equipment required to lift glass into place or if a crane is required.

The basic formula to calculate the weight of glass is as follows:

Glass weight (kg) = Glass area (m2) x Glass thickness (mm) x Factor (2.5)

Area of glass is calculated as height (m) x width (m)

If we can calculate the weight of 2mm annealed glass pane per sqm; 

Glass weight = 1 m2 x 2 x 2.5 = 5 kg/m2

The glass weight of 2 mm annealed glass pane is 5 kg per square meters. 


The weights of glass panes per sqm are as follows;

  • 2mm glass weighs 5 kg per m2
  • 4mm glass weighs 10 kg per m2
  • 6mm glass weighs 15 kg per m2
  • 10mm glass weighs 25 kg per m2
  • 12mm glass weighs 30 kg per m2


As you can see then glass can be very heavy, this piece would require a crane to lift it into place.

Weight of double glazed units

The most common thickness of glazing in domestic properties is 4mm, therefore, a typical DGU will weigh 20kg/m2. 

Weight of triple glazed units 

a TGU with 4mm nominal thickness glass will weigh 30kg/m2.