Roof Size Calculator

Use our Roof Size Calculator to figure out the total net roof area using the roof plan dimensions and slope.

We recommend using the PitchFactor mobile app to determine your roof slope (or pitch), which is the number of inches of vertical rise of the roof over a horizontal distance of 12 inches; for example, a “4 in 12” roof has a slope that rises 4 inches over a 12-inch run.

Once you figure out the size of your roof, check out our Roof Price Calculator to see how much it might cost to get a new roof!


*For simplicity and illustration purposes, notice all roof planes have the same slopes and all hips & valleys are framed at 45 degrees with respect to the eaves.

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