Roofing calculators
Roof area, pitch, shingles, metal panels, underlayment, sheathing, and rafters.
Roofing Calculator
Roofing Calculator estimates roof area, squares, bundles, rolls, and sheathing for simple pitched residential roofs.
Open calculator ↗RoofingRoof Area Calculator
Roof Area Calculator estimates sloped roof surface area for converting building footprint and pitch into roof square footage.
Open calculator ↗RoofingRoof Shingle Calculator
Roof Shingle Calculator estimates asphalt shingle squares and bundles for sloped residential roof takeoffs.
Open calculator ↗RoofingAsphalt Shingle Calculator
Asphalt Shingle Calculator estimates asphalt shingle bundles for architectural and three-tab shingle roofs.
Open calculator ↗RoofingMetal Roof Calculator
Metal Roof Calculator estimates metal panels by roof-plane layout for standing-seam and exposed-fastener roof planning.
Open calculator ↗RoofingRoof Pitch Calculator
Roof Pitch Calculator estimates pitch ratio, angle, slope, and common rafter line for checking measured roof rise and run.
Open calculator ↗RoofingRoof Underlayment Calculator
Roof Underlayment Calculator estimates underlayment rolls from roof area for felt or synthetic underlayment planning.
Open calculator ↗RoofingRoof Sheathing Calculator
Roof Sheathing Calculator estimates 4×8 roof sheathing sheets for simple pitched roof deck replacement or new construction.
Open calculator ↗RoofingRafter Calculator
Rafter Calculator estimates common rafter geometric line length for preliminary gable-roof layout from rise, run, and span.
Open calculator ↗Roofing guides
Use these Roofing guides to understand measurements, assumptions, material specifications, and ordering decisions before applying the related calculators.
Rafter Length from Run, Rise, and Pitch
Calculate common-rafter geometric line length from horizontal run and roof pitch, then account separately for overhangs, cuts, and stock length.
Read guide →RoofingRoof Area from Footprint, Pitch, and Overhangs
Calculate sloped roof area from horizontal footprint, pitch, overhang geometry, and separate roof planes before applying roofing waste.
Read guide →RoofingRoof Drip Edge Linear Feet and Pieces
Estimate roof drip edge from eave and rake lengths, required laps, corners, stock-piece length, cuts, and whole-piece rounding.
Read guide →RoofingRoof Ridge Vent Linear Feet
Estimate ridge vent length from required exhaust NFA, usable ridge length, product NFA per linear foot, and balanced intake capacity.
Read guide →RoofingAttic Ventilation Net Free Area
Estimate attic intake and exhaust net free area from attic floor area, applicable ventilation ratio, balance, and product NFA ratings.
Read guide →RoofingRoof Sheathing Nail Count and Spacing
Estimate roof sheathing fasteners from panel layout, supported edges, intermediate framing, specified spacing, and a purchase allowance.
Read guide →