Mansard Roof Area Calculator

Updated on 14-May-2026

Accurately calculate mansard roof area using building dimensions, slope angles, and overhang. Includes correct formulas, step-by-step example, and support for flat or double-slope mansard roofs.

Building Length

Building Width

Lower Slope Height

Upper Slope Height

Lower Slope Angle (degrees)

Upper Slope Angle (degrees)

Overhang Length

Waste Percentage (%)

Result

messages.Lower Slope Area (all sides)

Upper Slope Area (Flat Top)

Total Roof Area

Total Area with Waste

Number of Squares (1 square = 100 sq ft)

squares

Mansard Roof Area Calculator

Mansard Roof Area Calculator

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Mansard Roof Area Calculator