Roofing Calculators & Guides

Estimate roof pitch multipliers, 100 sq ft roofing squares, 3-bundle-per-square yields, drip edge linear feet, and gutter lengths.

Calculators

Roof Shingle Calculator — Calculate roofing squares, 3-tab and architectural shingle bundles, ridge caps, and starter strips.
Roof Pitch Calculator — Calculate roof pitch slope (X/12), angle in degrees, slope grade percentage, and area multiplier.
Roof Underlayment Calculator — Calculate synthetic underlayment rolls (10-square rolls), #30 felt paper, and ice & water shield barrier rolls.
Metal Roofing Calculator — Calculate standing seam panels, corrugated 3-ft exposed fastener sheets, trim flashes, and gasket screws.
Ridge Cap Calculator — Calculate specialized hip and ridge shingle bundles or 10-ft metal ridge cap trims for roof peaks.
Drip Edge Calculator — Calculate standard 10-ft aluminum/galvanized T-style and L-style drip edge flashing pieces for eaves and rakes.
Roof Ventilation Calculator — Calculate balanced Net Free Vent Area (NFVA 1:300 & 1:150 rules), continuous soffit intake vents, and ridge exhaust vents.
Roof Replacement Cost Calculator — Estimate full turnkey roof replacement costs including shingles, tear-off demo, underlayment, flashing, and licensed contractor labor.