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Calculate your roof pitch ratio, angle, and pitch factor from rise and run measurements.
It means the roof rises 6 inches for every 12 inches of horizontal run.
A 4/12 to 9/12 pitch is most common in residential construction.
Standard asphalt shingles require a minimum 4/12 pitch for proper water drainage. Low-slope roofs (2/12 to 4/12) require specialized roofing materials like rolled roofing or rubber membranes.
Stand at the gable end of the house, hold a level horizontally at the roofline, measure 12 inches along the level, then measure the vertical distance from that point down to the roof surface.
Material estimates are approximate. Actual quantities may vary due to waste, site conditions, design changes, material dimensions, labor methods and local pricing. Always verify with a qualified contractor or supplier before purchasing materials.