Glass Weight Calculator
Find the weight of a glass pane, tabletop, shelf, or mirror. Pick a rectangular or round pane, enter its size, thickness, and quantity, choose a glass type, and get the weight per pane and total in pounds and kilograms, the weight per square foot, and the cost — with by-thickness and by-glass-type tables and a downloadable PDF.
| Thickness | Per ft² | Per pane | Total |
|---|---|---|---|
| Enter a pane to compare | |||
| Type | Density | Per pane | Total |
|---|---|---|---|
| Enter a pane to compare | |||
How to use the glass weight calculator
Pick a rectangular or round pane, enter its size, thickness and quantity, choose a glass type, and get the weight per pane and total in pounds and kilograms, the weight per square foot and the cost — with by-thickness and by-glass-type tables and a downloadable PDF.
Choose shape & size
Rectangle uses length × width; round uses the diameter. Measure the glass itself, not the frame.
Set the thickness
Pick a common thickness from 1/8″ to 3/4″, or type a custom value in inches.
Pick the glass type
Clear, tempered, low-iron, mirror, acrylic or polycarbonate — this sets the density.
Read the result & save a PDF
See weight per pane and total, compare thicknesses and glass types, and download it.
How glass weight is calculated
Glass weight is just area × thickness × density. Since density is fixed for a given glass type, the weight comes down to how big the pane is and how thick it is — and a handy shortcut falls out of the numbers.
Worked example — 36″ × 24″ pane, 1/4″ clear glass
Area: 36 × 24 = 864 in² = 6 ft²
Weight per ft²: 156 × (0.25 ÷ 12) = 3.25 lb/ft²
Weight per pane: 6 × 3.25 = 19.5 lb
In kilograms: 19.5 × 0.4536 = 8.8 kg
A 36 × 24-inch quarter-inch clear glass pane weighs about 19.5 lb (8.8 kg) — roughly 3.3 lb for every square foot.
Glass weight reference charts
The numbers that come up most — weight per square foot by thickness, how much common pane sizes weigh, and how glass types compare by density.
| Thickness | Nominal | Per ft² | 10 ft² pane |
|---|---|---|---|
| 1/8 in | 3 mm | 1.6 lb | 16 lb |
| 3/16 in | 5 mm | 2.4 lb | 24 lb |
| 1/4 in | 6 mm | 3.3 lb | 33 lb |
| 3/8 in | 10 mm | 4.9 lb | 49 lb |
| 1/2 in | 12 mm | 6.5 lb | 65 lb |
| 3/4 in | 19 mm | 9.75 lb | 98 lb |
Standard soda-lime glass runs about 13 lb per square foot per inch of thickness. Weight scales straight with thickness — double it and the glass weighs twice as much.
| Pane | Area | Weight | In kg |
|---|---|---|---|
| 12 × 36 in shelf | 3.0 ft² | 9.8 lb | 4.4 kg |
| 36 × 24 in pane | 6.0 ft² | 19.5 lb | 8.8 kg |
| 48 × 24 in tabletop | 8.0 ft² | 26 lb | 11.8 kg |
| 30 in round top | 4.9 ft² | 16 lb | 7.2 kg |
| 48 × 36 in panel | 12.0 ft² | 39 lb | 17.7 kg |
Values rounded. At 1/2 inch these same panes weigh twice as much — worth checking before a solo lift or sizing a shelf bracket.
| Material | Density | Per ft² at 1/4″ |
|---|---|---|
| Clear float / tempered | ~156 lb/ft³ | 3.3 lb |
| Low-iron glass | ~158 lb/ft³ | 3.3 lb |
| Mirror | ~157 lb/ft³ | 3.3 lb |
| Acrylic | ~74 lb/ft³ | 1.5 lb |
| Polycarbonate | ~75 lb/ft³ | 1.6 lb |
Clear, tempered, low-iron and mirror glass all weigh about the same — tempering changes strength, not weight. Acrylic and polycarbonate are roughly half as heavy, which matters most on large panels.
A pane’s weight comes from three things: its area and its thickness give the volume, and the glass type’s density turns that volume into a weight — the pounds you have to lift, hang and support.
- Area and thickness are linear — twice the size or twice the thickness is twice the weight.
- Density depends on the material — glass is heavy, acrylic and polycarbonate about half as much.
- Tempering doesn’t add weight — it changes strength and how the glass breaks, not its density.
Everything the calculator works out
One set of inputs gives you the weight per pane and total, in pounds and kilograms, the weight per square foot and the cost — plus a comparison across thicknesses and glass types, and a report to save.
The figures behind every pane
Built for anyone sizing or lifting glass
A tabletop, a shelf, a mirror, a shower panel — the weight decides the brackets, the base, the glazing and whether it’s a one-person or two-person lift. Knowing it before you order or install saves a dropped pane or a bent bracket.
Ordering a glass tabletop, shelf or mirror and wanting to know the weight before buying brackets or planning the lift.
- Measure the glass, not the frame
- Check per-pane weight for lifting
- Compare ¼″ vs ⅜″ before ordering
Quoting and cutting glass to size, needing weight per pane and total for pricing, crating and handling.
- Weight per pane and run total
- Price per square foot
- Save the PDF to the order
Spec’ing glass railings, shower panels or shelving where the weight drives hardware, support and safe-lift planning.
- Size hardware to the load
- Plan two-person lifts
- Confirm glazing with the supplier
7 tips for working out glass weight
The things that throw off a glass estimate or a lift — and the checks that keep the weight accurate and the handling safe.
Glass weight FAQ
The weight, thickness and material questions people ask most when sizing a pane, tabletop, shelf or mirror.
Weight is area times thickness times density. Work out the pane area in square feet, multiply by the thickness in feet (inches ÷ 12), then by the glass density — about 156 lb per cubic foot for standard glass.
A shortcut: standard glass weighs roughly 13 lb per square foot for every inch of thickness, so about 3.3 lb per square foot at 1/4 inch. A 36 by 24-inch quarter-inch pane is 6 square feet, so around 20 lb. The calculator does this for any size, thickness and glass type.
About 3.3 lb per square foot for standard soda-lime glass at 1/4 inch (6 mm). That comes straight from the density: roughly 13 lb per square foot per inch of thickness, times a quarter inch.
So a 10-square-foot quarter-inch pane weighs around 33 lb. Thinner glass is proportionally lighter — 1/8 inch is about 1.6 lb per square foot — and thicker glass heavier in the same proportion.
No — tempered glass weighs essentially the same as standard annealed glass of the same size and thickness. Tempering is a heat treatment that changes the glass’s strength and how it breaks, not its density.
So a tempered pane and a regular pane cut to the same dimensions weigh the same. What does change the weight is thickness, size and glass type — laminated and insulated units add interlayers or extra lites, and acrylic or polycarbonate are much lighter.
Roughly half the weight. Acrylic is about 74 lb per cubic foot and polycarbonate about 75, against roughly 156 for glass — so a plastic sheet weighs a little under half what the same-size glass pane would.
That’s a big difference for large panels, shelves or anything you have to lift and hold overhead. The trade-off is that acrylic and polycarbonate scratch more easily than glass, so the choice is weight and safety versus surface hardness.
Multiply the area by the per-square-foot weight for the thickness. A common 1/4-inch tabletop weighs about 3.3 lb per square foot, and a heavier 1/2-inch top about 6.5 lb per square foot.
So a 48 by 24-inch (8 square foot) half-inch glass top is around 52 lb, while a small 12 by 36-inch quarter-inch shelf is about 10 lb. Use the weight to size the brackets, cabinet or base and to plan a safe lift.
A round pane’s area is π ÷ 4 × diameter². Multiply that area by the thickness and density just like a rectangle — only the area formula changes.
In the calculator, choose the Round shape and enter the diameter. A round pane is about 79% of the weight of a square pane whose side equals the diameter, because the circle fills less of that square.
It depends on the span and support, but 1/4 inch is common for protective tabletop covers, 3/8 to 1/2 inch for freestanding tops and larger shelves, and thinner glass for small framed panes. Thicker glass resists flex and feels more solid, at a real weight penalty.
Because weight scales directly with thickness, going from 1/4 to 1/2 inch doubles the weight. Confirm the right thickness and whether tempering is required with your glass supplier, especially for large or unsupported spans.
No — this estimates a single solid lite of glass. Laminated glass adds a plastic interlayer, and insulated units (IGUs) have two or more lites plus a spacer and air or gas gap, so both weigh more than one pane of the nominal thickness.
For a laminated or insulated build, add the weight of each glass lite separately and allow a little for the interlayer. The calculator is exact for a single pane; for multi-layer assemblies, sum the lites.
Estimate Only — Confirm With Your Glass Supplier: This calculator finds weight as area × thickness × density, using typical densities (standard float and tempered glass ≈ 156 lb/ft³, about 13 lb per square foot per inch of thickness; acrylic and polycarbonate about half). It assumes a single solid lite of glass. Laminated glass and insulated units (IGUs) weigh more because they combine several lites and interlayers, and actual thickness can vary from the nominal size. Use the result to plan lifting, hardware and support, not as a glazing or structural specification. For reference and estimating only; confirm glass thickness, type, weight and support requirements with your glass supplier before ordering or installing.