Estimate shingle bundles, squares, underlayment rolls, and roof area from footprint and pitch — with waste, bundles per square, and roll coverage.
Reviewed by James Okonkwo, Licensed Roofing Contractor · Last updated: May 2026
Hip roofs burn bundles faster than gables on the same footprint—those hip planes and valley cuts aren't free. This takeoff runs footprint, 6/12 pitch, hip geometry, waste, and your wrapper's bundles-per-square into one PO line. NRCA-style square math gets you close; field-verify valleys, starter, and ice barrier before the boom truck shows up.
Hip surface multiplier. NRCA takeoffs add hip plane area beyond a flat footprint—this tool applies an ~8% hip factor on top of pitch.[1]
Pitch at 6/12. Rise-over-run adds a 1.118 pitch factor before waste—shallow roofs look smaller until you walk the slope.
Bundles per square. Three is common on architectural lines; thick designer tabs may be four—read the wrapper, not habit.[2]
Underlayment roll coverage. Synthetic at 400 sq ft per roll is a planning number—steep hips eat extra rolls in overlap.
Ridge and starter. Hip caps, ridge caps, and eave ice barrier are LF orders— they don't live inside bundle math.
Example: A 32 ft × 44 ft hip footprint = 1,408 sq ft. At 6/12 with hip multiplier → ≈ 1,700 sq ft roof. Ten percent waste → ≈ 1,870 sq ft → 18.7 squares. At 3 bundles/square → 57 bundles. Underlayment at 400 sq ft/roll → 5 rolls before you add headlap on a cut-up hip.
Roof sq ft ≈ Footprint × Pitch factor × Shape multiplier
Order sq ft = Roof sq ft × (1 + Waste% ÷ 100)
Squares = Order sq ft ÷ 100
Bundles = Squares × Bundles per square (rounded up)
Underlayment rolls: Rolls = ⌈Order sq ft ÷ Sq ft per roll⌉
About 1,700 sq ft roof plus 10% waste → ~19 squares → 57 bundles at 3 per square. Confirm on your wrapper.[2]
Hip planes and diagonal cuts add surface and waste—the hip tab applies an extra multiplier NRCA crews expect.[1]
Simple hips often yes. Go 12–15% if you've got multiple valleys, skylights, or a steep 10/12 tie-in.
That's net roll coverage at 400 sq ft—add a roll if your spec doubles lap at valleys or on steep hips.
See our roof area calculator for pitch factor detail before waste and bundles.
Estimates are based on roofing industry standards. Actual quantities may vary by ±10% depending on roof geometry, waste, and manufacturer coverage. Always confirm with your supplier before ordering.