Low-E Coating Calculator

Analyze Low-E coating performance including U-factor reduction, SHGC, daylight factor, and seasonal performance by surface position.

Coating Emissivity

Solar Transmittance

Visible Transmittance

Coating Position

Tab to move between fields

U-Factor Reduction

41.26%

SHGC Value

0.44

Light-to-Solar Gain Ratio1.59

Winter Performance90%

Summer Performance48%

How to Use This Calculator

Enter the Coating Emissivity (typical Low-E range: 0.04–0.15), Solar Transmittance, and Visible Transmittance.
Select the Coating Position: Surface 2 (heating climate) or Surface 3 (cooling climate).
Review U-Factor Reduction percentage to quantify the insulation improvement from the Low-E coating.
Check SHGC Value to confirm solar heat control for your climate and orientation.
Use the Light-to-Solar Gain Ratio to balance daylight transmission against solar heat gain.

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