Solar Heat Gain Coefficient Calculator

Calculate effective SHGC accounting for window orientation, overhang shading, and interior shading devices.

Clear double: ~0.70, Low-e double: ~0.25-0.40, Triple: ~0.20-0.30
Horizontal projection from window, 0 if none
inches
Vertical distance from top of window to overhang
inches
Vertical height of glazing
inches
Summer peak: 60-75°, use peak cooling design condition
degrees
None: 1.0, Light curtain: 0.75, Medium blind: 0.50, Dark shade: 0.30

Results

Shadow Depth on Window-inches
Shaded Fraction-
Effective SHGC-
References: ASHRAE Fundamentals Ch. 18 - Nonresidential Cooling and Heating Load Calculations