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Roof area = footprint area × pitch multiplier. Pitch multiplier for 6:12 pitch = √(6²+12²)/12 ≈ 1.118. One roofing square = 100 sq ft. Add 10–15% waste for gable roofs, 15–20% for hip roofs. Asphalt shingles: 3 bundles/square. Include underlayment, ridge cap, and drip edge in material orders. Labor averages $3–6/sq ft; total installed cost $5–12/sq ft depending on materials.
~24.00 squares (100 ft² each)