WWR Windows to Wall Ratio Calculator by Avenir Developments
Plan smarter façades in minutes. This free WWR calculator helps architects, developers and owners balance daylight with cooling loads, compare glazing types (single/double/triple) and align early choices with LEED/ASHRAE‑style best practices—Pakistan and worldwide.
- Two modes: Single Wall or Multiple Walls (building/floor) with orientation auto‑mapping.
- Metric or Imperial units with live conversion
- Color‑coded guidance for conservative, balanced, high and very high WWR ranges.
- Glazing type selector (single/double/triple) with a cooling‑impact indicator
windows-to-wall ratio
What is Windows to Wall Ratio (WWR)?
Windows‑to‑Wall Ratio (WWR) is the percentage of exterior wall area that is glazed. Designers use WWR to shape daylight, views and façade expression while managing solar gains and energy performance. In hot climates like much of Pakistan, East/West glazing adds cooling load; careful orientation, shading and low‑e glass help keep interiors comfortable and efficient.
Windows to Wall Ratio (WWR) Calculator
Calculate WWR = Glazing Area ÷ Gross Wall Area for a single façade or an entire floor/building. Choose glazing type to see a cooling-impact indicator and guidance vs green-building best practices (LEED/ASHRAE-aligned).
Units & Calculation Mode
Single Facade — Wall & Window Inputs
Guidance Snapshot
LEED typically evaluates via whole-building energy modeling (e.g., ASHRAE 90.1). This quick check helps set façade strategy; confirm with your code, climate and glazing specs.
Hot seasons in Islamabad, Lahore and Karachi drive higher cooling loads—East/West façades benefit from vertical fins and selective glazing. Many high‑performance envelopes internationally aim near 20–40% weighted WWR, but compliance is ultimately demonstrated through whole‑building energy modeling (e.g., ASHRAE 90.1 based studies in LEED projects). Treat this calculator as an early‑stage guide and verify against local byelaws and your energy model.
wwr calculator
What is Windows to Wall Ratio (WWR)?
Windows‑to‑Wall Ratio (WWR) is the percentage of exterior wall area that is glazed. Designers use WWR to shape daylight, views and façade expression while managing solar gains and energy performance. In hot climates like much of Pakistan, East/West glazing adds cooling load; careful orientation, shading and low‑e glass help keep interiors comfortable and efficient.
avenir developments
Why Choose Avenir Developments
Avenir Developments is the best architecture firm which provides design + build services for a seamless project
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INTEGRATED DESIGN PRACTICE
Combining architecture, interiors, urban design and development management
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DEEP AUTHORITY-COORDINATION
Experience across CDA, LDA, SBCA, RDA, DHA and leading private societies
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FEASIBILITY TO DELIVERY
Concept options, code reviews, approvals, tender, supervision and close‑out.
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DIGITAL TOOLS LEADERSHIP
WWR, FAR/FSI, GFA, Parking and Stair Calculators used by clients and peers across Pakistan
floor area ratio calculator
Who is this WWR Calculator for?
Designed for architects, planners, developers, investors and students needing quick checks for Pakistan and worldwide Gren Buildings and Environment Impact contexts
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Architects & INTERIOR Designers
Testing massing options and window schedules
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Property Developers & owners
Balancing sellable aesthetics with energy and MEP targets
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Project managers & consultants
Comparing design iterations for approvals and RFPs
GET YOUR PERSONAL PROJECT PLAN IN MINUTES
Share your floor‑to‑floor heights, space program and byelaw constraints. We’ll propose stair options, run headroom checks, and integrate the layout with cores, lifts and egress for a clean approval path.
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faqs
FAQs ABOUT WINDOWS DESIGN
Get answers to common questions about Windows Design and WWR
No. Optimal WWR depends on climate, program, orientation and glass/shading selection. Many high‑performance buildings land in the 20–40% range when cost and energy are balanced.
LEED evaluates energy via modeling against a baseline (often ASHRAE 90.1). WWR influences results but there isn’t a single LEED‑wide cap; it’s about whole‑building performance.
Exclude opaque spandrels from ‘vision’ glazing for this quick check; your energy model should reflect actual thermal properties of each assembly.
It’s a qualitative index based on orientation and glazing type to guide early decisions. Final decisions should consider SHGC, U‑value, VLT, shading and simulation outputs.
Use it as a planning aid. For submissions to CDA, LDA, SBCA, RDA or DHA, follow their current byelaws and provide the required technical documentation.
faqs
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