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Calcimator

Skylight Sizing Calculator

Calculate optimal skylight area, roof percentage, daylight factor, and heat gain impact for natural daylighting design.

Inputs

sq ft
ft
%
°
°

Results

Skylight Area Needed

23.67 sq ft

Achieved Daylight Factor

5%

Skylights Needed (2×4)

3

Roof Opening Percentage5.92%
Peak Heat Gain7,101 BTU/hr
How to Use This Calculator
  1. Enter the Room Floor Area in sq ft and the Ceiling Height in feet.
  2. Enter the Target Daylight Factor percentage (2% = dim, 5% = well-lit, 10% = very bright).
  3. Enter the Roof Slope in degrees and your Latitude.
  4. Review Skylight Area Needed in sq ft and Recommended Count based on standard 2×4 ft units.
  5. Check Achieved Daylight Factor and Peak Heat Gain in BTU/hr for energy impact assessment.
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