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Roofing

Roofing Calculators

Roof area, shingles, underlayment, and gutter sizing. Based on NRCA and SMACNA standards.

Made for roofers

Five calculators for the roof

From estimating material quantities to sizing gutters, these tools cover the math roofers reach for every job.

Roof Area Calculator

Calculate total sloped roof area from footprint and pitch. Outputs square footage and squares.

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Shingle Estimator

Estimate bundles and squares needed from roof area with configurable waste factor.

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Roof Pitch Calculator

Calculate pitch ratio, angle, pitch factor, and rafter length from rise and run.

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Underlayment Calculator

Calculate rolls of underlayment needed based on roof area and overlap percentage.

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Gutter Sizing

Get recommended gutter size and downspout count for your roof drainage area.

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Roofing Reference Charts

Roof Pitch Factor Reference Chart
Pitch ratios from 1:12 to 12:12 with slope factors, angles, and practical notes for material take-offs.

Roofing Tool Guides

Coil vs. Strip Nail Guns: Which to Use for Roofing
Compare coil and strip framing nailers for shingle installation: capacity, speed, and when each makes sense.

Roofing Safety Tips

Fall Protection on Residential Roofs: OSHA Requirements
OSHA 29 CFR 1926.502 requirements for residential roofing: when guardrails, safety nets, and personal fall arrest systems are required.

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