Glass Weight Calculator

Weigh a glass pane or rod from its shape, size and density.

Eight shapes, nineteen glass densities, and both metric and imperial units.

Updated October 21, 2026

CreatorFrank Zhao

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What this calculator answers

A pane of glass is ordered by its size and handled by its weight, and the second number is the one nobody quotes on the order. This page turns the first into the second: choose the glass, choose the shape, type the measurements, and read how much the piece weighs — in grams, kilograms, tonnes, pounds or tons.

The figure you get is a real one, not a per-square-metre rule of thumb: it multiplies the actual volume of the piece by the density of the glass you picked, so a 6 mm and an 8 mm pane of the same size come out a third apart. One square metre of 6 mm annealed glass is 15 kg; one square metre of 10 mm flint glass is 37 kg.

Four jobs bring people to this page, and they all use the same screen:

Know what you are lifting. A splashback, a table top, a shopfront pane or a shelf: the weight decides whether it is a one-person carry, a two-person lift or a suction-cup job, and whether it can go in the van at all.
Turn a delivery list into a load. Set the piece count and the result is the batch weight that a freight quote, a pallet limit or a lift's capacity actually cares about.
Work backwards from a limit. Type the weight you can safely handle and the number of identical pieces is solved for you — that is how “24 kg per crate” becomes “ten panes of this size”.
Weigh glass that is not a rectangle. Round, semicircular and elliptical tops are calculated from their diameter or axes, a rod from its diameter and length, and any other outline from an area you measure yourself.

This is mass, which the trade calls weight

Grams, kilograms and pounds describe how much glass there is; that is what a scale at the yard reports and what a courier charges for. Strictly, weight is a force — a kilogram of glass presses down with about $\,9.81\ \mathrm{N}$ on Earth and a sixth of that on the Moon, while the mass is unchanged. For handling, shipping and buying, mass is the number that matters, and it is the number on this page.

How to weigh a pane

Choose the glass type

The menu carries nineteen glasses with their densities, and choosing one loads its figure — annealed and tempered sheet around

\,2.5\ \mathrm{g/cm^3}

, borosilicate down at

\,2.23\ \mathrm{g/cm^3}

, flint up at

\,3.7\ \mathrm{g/cm^3}

. If your glass is not listed, pick “— Other glass types —” or “Enter a custom glass density” and type the figure from your supplier.

Choose the shape

Eight shapes are offered. The dimension boxes change to match, so a rectangle asks for a height and a width, a circle for one diameter, an ellipse for two axes, a rod for a diameter and a length, and “Other shapes” for an area you supply.

Type the measurements, then the piece count

Each box is entered in the unit your tape or caliper reads, so a face in centimetres and a thickness in millimetres can sit side by side without converting anything. Set the quantity last; it multiplies the whole batch.

Read the volume and the total weight

A 40 cm × 30 cm pane of 8 mm annealed glass, five of them. The page works in three steps:

A

=

40 \times 30

=

1{,}200\ \mathrm{cm^2}

V

=

1{,}200 \times 0.8

=

960\ \mathrm{cm^3}

W

=

960 \times 2.5 \times 5

=

12{,}000\ \mathrm{g}

=

12\ \mathrm{kg}

So one pane is 2.4 kg and the five together are 12 kg. Sanity check: five panes of 40 cm × 30 cm are 0.6 m² of 8 mm glass, and 0.6 × 8 × 2.5 is also 12 kg.

Go the other way when you are limited by a number instead

The total weight is a working box, not a dead readout. Put the weight you are allowed to lift or ship into it and the page solves for the piece count instead — 24 kg of these panes is exactly ten pieces. Ask for 25 kg and it answers 10.4167 pieces and flags it, because a delivery of two-fifths of a pane is not a thing.

How the weight is worked out

There are only two multiplications in the whole calculation, and one of them is a density. The rest is geometry that depends on which shape you chose.

The two steps

V = A \times t

W = V \times \rho \times n

The first turns the face of the pane into a volume: area times thickness, which is the volume of a flat prism. The second multiplies that volume by how much a cubic centimetre of the glass weighs, and then by the number of pieces. For a rod the same two steps apply, except that the length replaces the thickness: $\;V = A \times L$ .

The face area of each shape

Shape	Face area	What you enter
Rectangular	$h \times w$	Height and width
Square	$s^{2}$	One side
Triangular	$\dfrac{b \times h}{2}$	Base and perpendicular height
Circular	$\dfrac{\pi d^{2}}{4}$	One diameter
Semi-circular	$\dfrac{\pi d^{2}}{8}$	Diameter across the flat edge
Elliptical	$\dfrac{\pi a b}{4}$	Both axes
Round rod	$\dfrac{\pi d^{2}}{4}$	Diameter and length
Other shapes	$A$	The area itself

What the symbols mean

$A$ — face area of the glass, in square centimetres; $t$ — thickness, in centimetres; $\,V$ — volume, in cubic centimetres.
$\rho$ — density of the chosen glass, in grams per cubic centimetre; $n$ — the number of identical pieces; $W$ — the total mass, held in grams and displayed in kilograms unless you change it.
For an ellipse, $a$ is the major axis and $\,b$ the minor axis; a triangle takes $b$ as its base and $\,h$ as its perpendicular height, not its sloping edge.

Everything that can be solved backwards

A

=

\dfrac{V}{t}

\qquad

t

=

\dfrac{V}{A}

\qquad

V

=

\dfrac{W}{\rho \, n}

\qquad

n

=

\dfrac{W}{V \rho}

A diameter goes backwards too, because a circle or rod area can be undone: $\;d = \sqrt{4A/\pi}$ . Give the circle a known area and the page returns the diameter that area implies — handy when a table top is quoted by area but manufactured from a round blank.

Mixed units are converted before anything multiplies

Each box converts what you typed into one common unit before the formulas run — square centimetres for area, cubic centimetres for volume, grams per cubic centimetre for density, grams for mass. That is why a thickness in millimetres, a face in inches and a result in pounds all behave. The factors are exact definitions rather than rounded table values: one inch is exactly 2.54 cm, one foot exactly 30.48 cm, one pound exactly 453.59237 g.

What each type of glass weighs

Density is the only thing that separates one glass from another on this page, and the spread is wider than most people expect — the same 10 mm sheet is 22.3 kg per square metre in borosilicate and 37 kg in flint. The figures below are the ones the type menu loads.

Glass type	Density (g/cm³)	1 m² of 10 mm glass
Alkali silicate	3.02	30.2 kg
Aluminosilicate glass	2.64	26.4 kg
Annealed glass	2.50	25.0 kg
Blue ornamental	2.488	24.88 kg
Borosilicate glass	2.23	22.3 kg
Bottle glass	2.50	25.0 kg
Crown glass	2.50	25.0 kg
Double glazing	2.5125	25.125 kg
Flint	3.70	37.0 kg
Laminated glass	2.48	24.8 kg
Lead crystal	2.96	29.6 kg
Pyrex	2.27	22.7 kg
Quartz	2.211	22.11 kg
Red ornamental	2.554	25.54 kg
Silica glass	2.20	22.0 kg
Soda lime silicate glass	2.486	24.86 kg
Tempered glass	2.52	25.2 kg
Window glass	2.51	25.1 kg
Zinc titania	2.531	25.31 kg

The last column is simply the density times ten, and it is the quickest way to sanity check your own numbers: a 10 mm pane of any soda-lime glass should land near 25 kg per square metre, and every millimetre of thickness adds a tenth of that. Flint and lead crystal are the heavy end because of the lead and heavy-metal oxides in them; borosilicate, Pyrex, quartz and silica sit at the light end because they are mostly silica.

A sealed unit is not one pane

The list has an entry called double glazing at $\,2.5125\ \mathrm{g/cm^3}$ , but the calculation only ever multiplies one area by one thickness. For a sealed insulating unit, enter one pane at a time and add the panes: the trapped air contributes nothing worth counting, and the spacer bar and sealant are not glass. Entering the unit's overall thickness with a glass density overstates the weight by the width of the air gap.

Three real jobs

A 6 mm splashback nobody wants to drop

Situation: A kitchen splashback is cut at 200 cm × 90 cm in 6 mm blue ornamental glass. It has to be carried up a stair and held on the wall while the adhesive grabs.

What was entered

Glass type:Blue ornamental
Shape:Rectangular
Height × width:200 cm × 90 cm
Thickness:6 mm
Quantity:1

V

=

18{,}000 \times 0.6

=

10{,}800\ \mathrm{cm^3}

W

=

10{,}800 \times 2.488

=

26{,}870\ \mathrm{g}

\approx

26.87\ \mathrm{kg}

What to do with it: Treat it as a two-person lift with cups, and plan where it is set down before it leaves the van. One person holding 27 kg of unsupported glass is exactly the situation that ends with a broken pane and a cut hand.

A borosilicate rod under a glass shelf

Situation: A shelf unit uses 20 mm borosilicate rods, 1 m long, as the front supports. The brackets are rated in kilograms and the rods are the first thing they carry.

What was entered

Glass type:Borosilicate glass
Shape:Round rod
Diameter:20 mm
Length:1 m

A

=

\dfrac{\pi \times 2^{2}}{4}

=

3.1416\ \mathrm{cm^2}

W

=

3.1416 \times 100 \times 2.23

=

700.6\ \mathrm{g}

What to do with it: Each rod is about 0.7 kg, so two brackets share well under a kilo of glass before the shelf itself and anything on it. Run the same rod in soda-lime glass and it comes out at 0.785 kg — a 12% difference that matters only if you are choosing between the two.

Filling a crate without going over the limit

Situation: The same 40 cm × 30 cm, 8 mm annealed panes are going out in a crate that is both size-limited and rated to 24 kg for the courier.

What was entered

Glass type:Annealed glass
Pane:40 cm × 30 cm × 8 mm
Weight entered:24 kg

n

=

\dfrac{24{,}000}{960 \times 2.5}

=

10

What to do with it: Ten pieces, 2.4 kg each. If the limit were 25 kg the page would report 10.4167 pieces and mark the count — the honest answer is that ten fit comfortably and eleven would be over.

Measurements that change the answer

Measure the glass, not the opening

Rebates, beads, frame covers and silicone joints are not glass. Measuring the hole in the wall adds a couple of centimetres on each side, which on a 1 m² pane is easily a kilogram of weight that will never exist.

Thickness is the multiplier that bites

Going from 4 mm to 6 mm is 50% more weight, and 6 mm to 10 mm is nearly double. Read thickness with a caliper away from the edge, and for laminated glass take the whole stack including the interlayer, because that is what the piece weighs.

One size per run

Quantity assumes every piece is identical. Two sizes in one order need two runs, or the total will be wrong for both. It is quicker to add two results than to unpick a mixed crate at the van.

Odd outlines go through an area

Arched, L-shaped or patterned panes belong in “Other shapes”: split the outline into rectangles, triangles and circle segments, add the pieces, subtract the cut-outs, and enter the area. If the supplier charges by area, the square yards and material cost calculator turns that area into a price.

Cut-offs do not ship

Measure the finished size, not the blank. A 220 cm × 100 cm blank trimmed down to 200 cm × 90 cm weighs what the trimmed piece weighs — 26.87 kg, not 32.84 kg.

Carry the per-millimetre rule in your head

For ordinary soda-lime glass, one square metre of one millimetre thickness is 2.5 kg. Multiply the area in m² by the thickness in mm by 2.5 and you have a check you can do on site, before opening the calculator.

Questions people ask

Does tempered glass weigh more than ordinary glass?

By about 0.8%. The list carries tempered glass at $\,2.52\ \mathrm{g/cm^3}$ and annealed glass at $\,2.5\ \mathrm{g/cm^3}$ , so a square metre of 10 mm glass is 25.2 kg tempered against 25 kg annealed. Tempering is a heat treatment and does not add material; the two figures differ because the two glasses are not quite the same composition.

Why does it refuse a fractional number of pieces?

Because you cannot deliver 10.4167 panes. The quantity must be a whole number, so when a weight limit does not divide evenly the page shows the implied count — 10.4167 pieces for a 25 kg limit on a 2.4 kg pane — and flags it rather than rounding behind your back. Round down for what fits, or trim the pane size and recalculate.

My glass is not in the density list. What do I enter?

Pick “— Other glass types —” or “Enter a custom glass density” and the density box unlocks so you can type the figure your supplier quotes. Converting is straightforward: $\,2.5\ \mathrm{g/cm^3}$ is $\,2{,}500\ \mathrm{kg/m^3}$ or about $\,156\ \mathrm{lb/ft^3}$ , and the box accepts any of those scales.

Does the total include the frame, sealant or fittings?

No — only glass. Frames, hardware, mastic, packaging and pallet weight all sit on top of the number here. If the frame is aluminium and you are planning the whole lift, the aluminum weight calculator covers profiles, plate and bar by alloy and size, and the two figures add up.

Where the number stops

The densities are nominal figures. A glass recipe varies by plant, colour and batch, so treat the table as a good starting point rather than a certificate. Expect a percent or two either way, and weigh the actual piece when the number has to be exact.
Straight-sided solids only. The formulas are a prism (area times thickness) and a cylinder (rod), so bevelled and polished edges, drilled holes, notches, cut-outs and curved or domed glass are not modelled. Holes and cut-outs make the real piece lighter than the answer; a domed piece can go either way.
Thickness is what you type, not what was ordered. Float glass is sold to a nominal thickness with a manufacturing tolerance, and a caliper reading at one point can differ from the figure on the delivery note. Coatings, printed frit and sandblasting change the weight by a negligible amount, but a laminated stack is genuinely thicker than one of its panes.
This is a weight estimate, not a lifting plan. It says nothing about whether a pane can be carried by one person on your site, what a suction cup or a crane is rated for, or how a pane behaves once it is installed. Manual-handling rules, equipment ratings and site procedures come from your employer or the applicable regulation, not from this page.
Not a structural or compliance calculation. Wind load, deflection, the glass thickness a balustrade or a floor-to-ceiling screen legally needs, and whether a location requires safety glass are separate engineering and regulatory questions. Those decisions belong to a qualified engineer and the standard that applies where you are building.
Glass is heavy and brittle; handling it is the risky part. Use two people and proper cups for anything in the tens of kilograms, keep the load path clear, and never carry a pane by its edges with bare hands. When in doubt, ask for a second pair of hands and a rated lifting aid.

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