// multi-utility computation suite · offline · instant · precise
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build.window-to-floor-area Calculator
Calculates the window-to-floor-area ratio (WFA) and compares it to building code minimums for natural light and ventilation. Most residential codes require a minimum WFA of 8% for habitability — this checks compliance before drawings are finalised.
Inputs
Floor Area M2
Two-dimensional surface extent (m²). For complex shapes, break into simpler sub-shapes and sum.
Window Area M2
Two-dimensional surface extent (m²). For complex shapes, break into simpler sub-shapes and sum.
Room Type
Reference formula or conversion factor shown for context.
Results
WFA ratio
The proportional relationship between two quantities.
code minimum (typical)
The smallest value in the dataset or feasible range.
compliant?
Sample size or count used in the calculation.
natural light rating
A standardised quality or risk rating on the applicable scale.