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The weight of one square metre, in kilograms.
For monolithic glass, multiply the thickness in millimetres by 2.5 — soda-lime float runs about 2500 kg/m³, so 10 mm is 25 kg/m². For a laminate, count every glass ply and add a little for the interlayer, which stays well under 2 kg/m² at standard thicknesses. For a built-up wall, sum only the layers you are actually installing.
Weight per square foot
5.12 lb/ft²
Converted using an exact defined factor of 0.20481614363859052 lb/ft² per kg/m². Fixed by definition; the uncertainty lives in glass thickness tolerances and in whatever the datasheet's figure did or did not include.
- Conversion factor applied
- 0.2 lb/ft² per kg/m²
They open the calculator with your figures already in it
kg/m² to lb/ft² Calculator: 5.12 lb/ft² — shown in imperial, US market. The link sets both, so the result they see is the one on your screen.
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How this was calculated
Formula source(s)
- One square foot is 0.09290304 m² and one pound is 0.45359237 kg, so a kilogram spread over a square metre is 0.20481614362252169277… lb/ft². The ratio is exact; the printed decimal is a truncation of it.
Inputs used
- Area weight (kg/m²)
- 25
Intermediate steps
- Conversion factor applied
- 0.2 lb/ft² per kg/m²
Confidence note: Converted using an exact defined factor of 0.20481614363859052 lb/ft² per kg/m². Fixed by definition; the uncertainty lives in glass thickness tolerances and in whatever the datasheet's figure did or did not include.
Add the equipment this sizes
This result is a specification — 5.12 lb/ft² — not a quantity. Put the thing it sizes into your project: how many, what you call it, and your supplier’s price.
Computed in your browser — nothing you enter is uploaded. Presented in US customary units and US trade terminology. Where a formula follows a published standard, that standard and its edition are cited beside it on this page; where none governs, the page says so. Local amendments override model codes — verify against the code in force where you build.
Sources checked 2026-08-26 · in the site-wide review of 2026-09-06 · v1.0.0
Regulatory standards & verification citations1
- One square foot is 0.09290304 m² and one pound is 0.45359237 kg, so a kilogram spread over a square metre is 0.20481614362252169277… lb/ft². The ratio is exact; the printed decimal is a truncation of it.
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Glazing and cladding datasheets are metric nearly everywhere; the people needing the figure on a North American job are not. This turns a supplier's 25 kg/m² for 10 mm float into the 5.12 lb/ft² a structural engineer wants as dead load, or into the pounds a vacuum lifter is rated to hold. Convert what will actually be hung or picked up rather than the datasheet line — an insulating unit is both leaves plus its spacer, and a framed panel carries aluminium that never appears on a glass schedule. The arithmetic is quiet enough to hide a slip: lb/ft² runs at roughly a fifth of kg/m², so a misplaced decimal still looks plausible. Anchor on 1 kg/m² ≈ 0.2048 lb/ft².