` = "Roof Section Area"`

Enter a value for all fields

The Area of a Roof Section calculator computes the area (square feet), and number of bundles of shingles for a roof section based on the dimensions (see diagram).  

INSTRUCTIONS: Choose units and enter the following:

• (T) Top Length
• (B) Bottom Length
• (R) Right Side Length
• (L) Left Side Length

Roof Section Area (A): The calculator returns the area in square feet.  However, this can be automatically converted to compatible units via the pull-down menu.  The calculator also returns:

• (nAB) Number of Architectural Shingle Bundles (32.8 ft²) 
• (nSB) Number of Standard Shingle Bundles (33.33 ft²)
• (h) Perpendicular Height (see diagram)

The Math / Science

The surface area of the Roof Section described above is equal to the area of a trapezoid.  The important aspect is that the top (T) and bottom (B) lines are roughly parallel, no two sides are the same length, and no one side is greater than the sum of the other three.  The top or the bottom can be longer.

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Roof Types

Roofing Calculators

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