Free tool · glass panels
Glass Weight Calculator
Glass weighs about 2.5 kg per square metre for every millimetre of thickness. Enter a panel's size and thickness to get its weight in kg - useful for choosing hinges, floor springs and patch fittings, and for planning how a panel goes up the stairs.
The formula
Weight (kg) = width (m) × height (m) × thickness (mm) × 2.5. Soda-lime glass has a density of roughly 2,500 kg per cubic metre, so one square metre 1 mm thick weighs about 2.5 kg. Toughening does not change the weight; laminated glass is the sum of its layers.
| Thickness | Weight per sq m | Weight per sq ft | Common use |
|---|---|---|---|
| 5 mm | 12.5 kg | 1.2 kg | Windows, cabinet glass |
| 8 mm | 20 kg | 1.9 kg | Small screens, some shower doors |
| 10 mm | 25 kg | 2.3 kg | Shower partitions and enclosures |
| 12 mm | 30 kg | 2.8 kg | Office cabins, shop fronts, doors |
Why the weight matters
A 12 mm door 3 ft by 7 ft weighs around 58 kg. That decides the hardware: hinges and floor springs are rated for a maximum door weight and width, and a door that is too heavy for its fittings drops, drags and wears them out - see glass door dropped and dragging. It also decides access: a panel over about 60 kg needs more hands on a staircase.
Common questions
How heavy is 10 mm glass?
About 25 kg per square metre, or roughly 2.3 kg per square foot. A 3 × 7 ft shower door in 10 mm glass weighs around 49 kg.
How heavy is 12 mm toughened glass?
About 30 kg per square metre, or roughly 2.8 kg per square foot. Toughening does not change the weight of the glass.
Does laminated glass weigh more?
It weighs the sum of its glass layers plus a small amount for the interlayer, so 6+6 mm laminated weighs about the same as 12 mm monolithic glass.
Can a heavy glass door use ordinary hinges?
Only if the hinges are rated for its weight and width. Heavy doors usually go on a floor spring or heavy-duty glass hinges; check the maker's rating.
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- Glass partition cost calculatorWork out the cost of a shower partition, glass cabin or shop front from its size, at FabWise's published all-inclusive rates for Delhi NCR.
- Sq ft & running ft calculatorConvert feet, inches, mm or metres into sq ft for glass and windows, or running ft for railings, across several panels at once. Free, no sign-up.