Window Relative Solar Heat Gain Coefficient – Single Calc

Quickly calculate the Relative Solar Heat Gain Coefficient (RSHGC) for a single window — a key input for energy audits, load calculations, and building envelope assessments.

This Excel-based calculator uses orientation-specific coefficients (North, East/West, South) to account for how sun exposure differs by direction, so you get an accurate, direction-adjusted SHGC instead of relying on a generic nameplate number.

Included:

• Single-window RSHGC calculator (Excel)
• Built-in North / East-West / South coefficients
• Clean, editable inputs — no macros, no special software required

Need to calculate multiple window types at once? Check out the Multi-Window RSHGC Calculator in my shop.

No Subscription · Yours Forever · Customizations Available