Daylighting Calculator

Calculate daylight correction factor and effective daylighting area per building code — free architectural design tool

Related Categories:Building Services

Room Type

Required ratio: Effective window area / Floor area ≥ 1/7 (14.3%)

Area Input

Window Area (m²)

Floor Area (m²)

Window Position

Adjacent Distance (m)

Adjacent Height (m)

Window Center Height (m)

Obstruction Angle: 42.0°

Daylighting Check Result

FAIL

9.00% < 14.29%

Calculation Details

Window Area3.6 m²

Correction Coefficient0.50

Effective Window Area1.80 m²

Floor Area20 m²

Effective / Floor9.00%

Required Ratio1/7 = 14.29%

Required Window Area5.71 m²

Formula

Effective Area = Window x Coeff

= 3.6 x 0.50 = 1.80 m²

Check: 1.80 / 20 = 9.00%

< 14.29% (1/7)

Correction Coefficients (Side Window)

Required Ratios by Room Type