MM to sq ft converter for glass
Enter your panel size in millimetres to get the area in square feet and square metres — the numbers a glass shop uses on the bill. Add a ₹/sqft rate to see an indicative panel cost.
1,200 mm × 2,100 mm = 25,20,000 mm² ÷ 92,903.04 = 27.13 sq ft
Exact conversion (1 sq ft = 92,903.04 mm²). The cost figure is indicative only — fabricators usually round each piece up to the next 0.25 or 0.5 sq ft, may apply a minimum billable area, and add cutting, polishing and toughening charges. Confirm the billing method with your supplier.
The formula
Area (sq ft) = width (mm) × height (mm) ÷ 92,903.04. The divisor is exact: 1 foot is 304.8mm, so one square foot is 304.8 × 304.8 = 92,903.04 mm². For square metres, divide the mm² figure by 1,000,000 instead — or divide the sq ft figure by 10.764.
Worked example: a 1200mm × 2100mm shower panel is 1200 × 2100 = 2,520,000 mm² ÷ 92,903.04 = 27.13 sq ft. At an indicative ₹120–160/sqft for 10mm toughened glass, that is roughly ₹3,300–4,300 for the glass alone, before edge polishing, cutouts and installation.
Why sizes are in mm but quotes are in ₹ per sq ft
Indian glass fabrication is fully metric: cutting tables, CNC machines, IS standards and thickness are all specified in millimetres, and float-glass makers like Saint-Gobain, AIS and Modi Guard publish sheet sizes in mm. Pricing, however, kept the older imperial trade convention — every counter quote, rate card and bill you see is in rupees per square foot.
So the same panel lives in two unit systems: you measure and order it in mm, and the shop converts that to sq ft to price it. This page does that conversion the same way the trade does, which makes it easy to sanity-check a quotation line by line.
Common glass panel sizes in sq ft
| Size (mm) | Typical use | Area (sq ft) | Area (m²) |
|---|---|---|---|
| 610 × 1220 | 2 ft × 4 ft cut piece | 8.01 | 0.74 |
| 915 × 1830 | 3 ft × 6 ft piece | 18.02 | 1.67 |
| 1220 × 2440 | 4 ft × 8 ft full sheet | 32.04 | 2.98 |
| 1200 × 2100 | Typical door / shower panel | 27.13 | 2.52 |
| 1500 × 2400 | Large partition / facade panel | 38.75 | 3.60 |
How fabricators round the area on the bill
Billed area is almost always rounded up, never down. Most fabricators round each piece to the next 0.25 or 0.5 sq ft — so the 27.13 sq ft panel above is typically billed as 27.25 or 27.5 sq ft. Many also apply a minimum billable area per piece (often around 1 sq ft), which is why a small 300mm × 300mm shelf costs more per sq ft than the rate card suggests.
These conventions vary by supplier — some measure to the next inch before calculating area, and works like polishing, holes and cutouts are billed separately. When comparing two quotes, ask both suppliers how they round and what their minimum billable area is; on a job with many small pieces the rounding rule can matter more than the headline rate.
Frequently asked questions
How do I convert mm to square feet for glass?
Multiply the width and height in millimetres, then divide by 92,903.04. Example: a 1200mm × 2100mm panel is 2,520,000 mm² ÷ 92,903.04 = 27.13 sq ft. The divisor comes from 1 foot = 304.8mm, so 1 sq ft = 304.8 × 304.8 = 92,903.04 mm².
Why is glass measured in mm but priced per square foot in India?
Fabrication is metric — cutting machines, IS standards and thickness are all specified in millimetres — but the Indian glass trade kept the older imperial pricing convention, so quotes are given in rupees per square foot. Suppliers therefore take your mm sizes and convert them to sq ft on the bill.
How many square feet is a 4ft × 8ft glass sheet?
A 4ft × 8ft sheet is 32 square feet. In millimetres that is roughly 1220mm × 2440mm, which works out to 32.04 sq ft — the tiny difference exists because 1220mm and 2440mm are metric roundings of the exact imperial size.
How do glass shops round the area when billing?
Most fabricators round each piece up to the next 0.25 or 0.5 sq ft, and many apply a minimum billable area per piece — often around 1 sq ft — so small pieces cost more per sq ft than the rate suggests. The exact rounding rule varies by supplier, so ask before comparing quotes.
How do I convert glass area from square feet to square metres?
Divide the square-foot figure by 10.764, or multiply by 0.0929. Example: a 32 sq ft sheet is about 2.97 m². Architects and IS load tables usually work in m², while shop quotations stay in sq ft, so you will often need both numbers on the same project.
Does glass thickness change the mm to sq ft conversion?
No. The conversion is pure area — only width and height matter. Thickness affects the rate you are quoted (12mm glass costs more per sq ft than 5mm) and the panel weight, but a 1200mm × 2100mm panel is 27.13 sq ft whether it is 4mm or 19mm thick.
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