// multi-utility computation suite · offline · instant · precise
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tool.window-to-floor-area-ratio Calculator
Calculates window-to-floor-area ratio and checks compliance with the IBC minimum of 8% for natural light in habitable rooms. Window area is also a key heat loss driver — this balances compliance with thermal performance.
Inputs
Window Area Sqft
Two-dimensional surface extent (m²). For complex shapes, break into simpler sub-shapes and sum.
Floor Area Sqft
Two-dimensional surface extent (m²). For complex shapes, break into simpler sub-shapes and sum.
Window U Value
Reference formula or conversion factor shown for context.
Heating Degree Days 65
Reference formula or conversion factor shown for context.
Results
window-to-floor ratio (WFR)
The proportional relationship between two quantities.
annual window heat loss (MMBtu)
The result expressed on a per-year basis.
ASHRAE recommendation
Suggested action or value based on the computed results and applicable best-practice guidelines.