Window Size / Area Calculator
Calculate window area and glazing requirements.
Window Area
12.00 ft²
Total Glass Area
48.0 ft²
Rough Opening
36.5" × 48.5"
Glass-to-Floor
24.0%
Min 8% req'd
United Inches (UI): 88". Rough opening = window size + ½" each direction. IRC requires glazing area ≥ 8% of floor area for habitable rooms.