Why is the panel count rounded up?

A partial panel cannot be manufactured or installed as a fraction of a unit, so the facade area is divided by the single panel area and rounded up (ceiling) to the next whole panel.

Does this account for corner units, custom-sized panels at building edges, or openings?

No — this estimates panel quantity from total facade area and a typical panel size only. Corner conditions, custom infill panels at edges/setbacks, and openings (louvers, doors) typically require custom-sized units that should be counted separately from the elevation drawings.

How do I determine my single panel area?

Multiply the panel's typical module width by its floor-to-floor (or panel) height, per your specific unitized curtain wall system design — for example, a 1.5m wide × 4m tall unit gives 6 m².

Materials & Quantities

Curtain Wall Panel Count Calculator

Calculate how many unitized curtain wall panels are needed to cover a building facade.

Answers as you typeNo submit button
Every formula citedNamed published standards
Calculated in your browserNo account, nothing uploaded

SettingsSettings for this calculationUS

Market

Imperial · sales tax

Total Facade Area

The total area of the building facade to be covered in unitized curtain wall.

Use the total glazed facade area from the elevation drawings, including spandrel and vision areas.

Single Panel Area

The area of one standard unitized curtain wall panel — a 1.5 × 4 m unit is 6 m², a 5 × 13 ft unit is 65 sq ft.

Determine this from the panel's typical module width and floor-to-floor height — e.g. a 1.5m × 4m unit = 6 m², or a 5ft × 13ft unit = 65 sq ft.

Curtain wall panels needed

83 panels

High confidence

Then change the inputs to see how far the answer moves.

Show calculation logic

How this was calculated

Formula source(s)

Panel count = ceil(total facade area ÷ single panel area), the standard method for estimating unitized curtain wall panel quantities

Inputs used

Total Facade Area: 5380 sq ft
Single Panel Area: 65 sq ft

Final result83 panels

What this calculation does not cover

Gives no spares, and a unitized panel is the one thing on a facade you cannot buy again quickly. Each unit is made to order with a lead time measured in weeks, so one damaged in transit, dropped off the hook, or broken by a following trade leaves an opening in a sealed building until a replacement is fabricated and shipped. Attrition units go on the first order or they are not available when they are needed.
Counts panels, not the anchors they land on. Every unit hangs from cast-in embeds or slab-edge brackets that must be set, surveyed and shimmed to a tolerance a concrete frame rarely holds unaided, and it is that survey — not the panel quantity — that decides whether hanging starts on schedule. Out-of-tolerance edges are corrected with shims and extended anchors, neither of which this number orders.

Estimated cost — your price

Price per panel ($)

This site holds no price list for this material — local prices vary too much to publish honestly. Enter your supplier's price and the result is costed with it.

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 2026-09-06 · in the site-wide review of 2026-09-06 · v1.1.1

Regulatory standards & verification citations1

Panel count = ceil(total facade area ÷ single panel area), the standard method for estimating unitized curtain wall panel quantities

Cite this page

Your workspace

Most jobs need more than one number. Add the calculators you need next and they open right here, underneath this one — your figures stay on screen and nothing is lost to a page change.

Now that you have the number

These guides cover the work this quantity is for — the first ones run this calculator inside the section that raises the question.

Installing a Curtain Walluses this calculator
The mullion carries and the glass rides: a facade install organised around the load path from glass to frame to bracket to slab edge.
Water Testing a Facade on Siteuses this calculator
A nozzle proves a sealed joint and nothing else. Which field method the specification actually bought, who has to witness it, and what one fail costs.
Curtain Wall Condensation: Where the Warm Side Stops

Called something else where you work? Curtain wall — the term in each market, how close the equivalence really is, and the standard that governs it.

Still deciding? Curtain Wall vs Storefront Glazing — the factors that actually differ, with no invented prices.

How to calculate curtain wall panel count in 3 steps

Total Facade AreaThe total area of the building facade to be covered in unitized curtain wall.
Single Panel AreaThe area of one standard unitized curtain wall panel — a 1.5 × 4 m unit is 6 m², a 5 × 13 ft unit is 65 sq ft.
Curtain wall panels neededThe tool computes the curtain wall panels needed from those figures and shows the formula, its sources, and a confidence rating alongside it.

Curtain wall panels needed by total facade area

Page defaults, not your figures above.

Total Facade Area	Curtain wall panels needed (panels)
4,000 sq ft	62
6,000 sq ft	93
8,000 sq ft	124
10,000 sq ft	155

Frequently asked questions

Why is the panel count rounded up?: A partial panel cannot be manufactured or installed as a fraction of a unit, so the facade area is divided by the single panel area and rounded up (ceiling) to the next whole panel.
Does this account for corner units, custom-sized panels at building edges, or openings?: No — this estimates panel quantity from total facade area and a typical panel size only. Corner conditions, custom infill panels at edges/setbacks, and openings (louvers, doors) typically require custom-sized units that should be counted separately from the elevation drawings.
How do I determine my single panel area?: Multiply the panel's typical module width by its floor-to-floor (or panel) height, per your specific unitized curtain wall system design — for example, a 1.5m wide × 4m tall unit gives 6 m².

Preliminary estimate, not certified engineering. This tool produces an indicative quantity calculation for planning purposes only — it is not a certified structural analysis, a guaranteed material takeoff, or a substitute for building department approval. Always verify measurements on-site and have a licensed contractor or structural engineer review any load-bearing, code-sensitive, or safety-critical work before purchasing materials or starting construction. Spotted an arithmetic or standards error? Report it to contact@craftquantities.com with your inputs — a confirmed fix gets a permanent check of its own, so the same mistake cannot come back.