Roofing Calculators Directory
Free, accurate, and easy-to-use roofing calculators engineered for homeowners, contractors, estimators, and builders.
Featured Calculators
Roofing Calculator
Master calculator: compute true 3D surface area, pitch multipliers, roofing squares, material bundles, and comprehensive itemized project costs.
Roof Area Calculator
Compute true roof surface square footage from building footprint, overhang eaves/rakes, multi-plane sections, and pitch slope multipliers.
Roof Pitch Calculator
Find pitch ratio (X/12), slope angle in degrees, grade percentage, area multiplier, and hip/valley factors with visual diagrams.
Roof Slope Calculator
Convert between pitch (X/12), angle in degrees (°), slope grade (%), and ratio (1 in X) with building code classifications and drainage standards.
Roofing Square Calculator
Convert total square footage to standard 100 sq ft roofing squares (SQ) with customizable waste factors, bundle counts, and dead load weights.
Roof Shingle Calculator
Estimate 3-tab, architectural, or luxury shingle bundles, starter strip courses, hip & ridge caps, coil nails, and synthetic underlayment.
Roof Cost Calculator
Itemize materials, labor, tear-off, synthetic underlayment, flashing kits, ventilation, dumpster fees, and custom contractor rates.
Roof Replacement Cost Calculator
Estimate full tear-off and replacement costs including multi-layer stripping, rotted plywood decking sheets, chimney flashing, and pitch difficulty.
Metal Roof Calculator
Calculate standing seam, corrugated, or ribbed metal panels, cut lengths with eave overhangs, linear footage, clips/screws, and trim pieces.
Rafter Calculator
Determine theoretical rafter line length, overhang tail length, tip-to-tip cut length, plumb & seat angles, bird’s mouth depth, and lumber stock.
Calculators by Category
Explore dedicated calculators tailored for measurements, materials, costs, geometry, and installation.
Roof Geometry & Slopes
Calculate pitch ratios, slope in degrees, grade percentages, hip/valley multipliers, and rafter framing cuts.
Measurements & Area
Calculate footprint dimensions, overhangs, actual 3D rafter surface area, and conversion to roofing squares.
Materials & Shingles
Calculate bundles of asphalt shingles, standing seam metal panels, underlayment rolls, starter strips, and fasteners.
Cost & Replacements
Accurate estimates for tear-off, labor, decking inspection, disposal fees, and material replacement costs.