Case 1
- Material
- Float glass
- Length
- 1000mm
- Width
- 1000mm
- Thickness
- 6mm
15.00kg
Open with these valuesGlass Weight Calculator
15.00kg
Result: 15.00 kgOne square metre of float glass weighs 2.5 kg per millimetre of thickness — that single sentence covers most of what this calculator does. Acrylic is under half that, which is why a large pane is often plastic rather than glass.
The numbers at a glance
Held fixed: Material Float glass, Length 1,000.00 mm, Width 1,000.00 mm.
| Thickness (mm) | Result (kg) |
|---|---|
| 2.00 | 5.00 |
| 4.00 | 10.00 |
| 6.00Your value | 15.00 |
| 8.00 | 20.00 |
| 10.00 | 25.00 |
| 12.00 | 30.00 |
Worked examples
Case 2
- Material
- Acrylic
- Length
- 1000mm
- Width
- 1000mm
- Thickness
- 6mm
7.14kg
Open with these valuesCase 3
- Material
- Float glass
- Length
- 500mm
- Width
- 400mm
- Thickness
- 4mm
2.00kg
Open with these valuesHow it's calculated
kg = length × width × thickness × density
- StepPick the material.
- StepSwitch the units above if you work in inches and pounds.
- StepEnter length, width and thickness.
- ResultRead the weight of one pane; a frame adds its own.
Reference table
| Material | Density | One m² at 6 mm |
|---|---|---|
| Float glass | 2500 kg/m³ | 15.0 kg |
| Laminated glass | 2500 kg/m³ | 15.0 kg |
| Borosilicate | 2230 kg/m³ | 13.4 kg |
| Polycarbonate | 1200 kg/m³ | 7.2 kg |
| Acrylic | 1190 kg/m³ | 7.1 kg |
Questions
How much does glass weigh per square metre?
Float glass weighs 2.5 kg per square metre per millimetre of thickness. A square metre at 6 mm is therefore 15 kg, and that single sentence covers most of what this calculator does.
How much lighter is acrylic or polycarbonate?
Roughly half. The same square metre at 6 mm is 15 kg in float glass, 7.2 kg in polycarbonate and 7.14 kg in acrylic; borosilicate sits at 13.38 kg.
Does toughened glass weigh more?
No. Toughening changes the stress in the glass, not its density, so a toughened pane weighs the same as an ordinary one of the same size.
How do I work out a double-glazed unit?
Calculate each pane separately and add them; the gas in the cavity is negligible against the glass. The frame and spacer are not included either.
How accurate is the result?
The arithmetic is exact — volume times density. The density is where the uncertainty sits, and the source behind this calculator carries acrylic exactly while glass is quoted as a range.
Sources and last check
Information, not professional advice.