30+ free roofing calculators to estimate roof area, pitch, materials, and costs. Get instant results and downloadable PDF reports.
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Measure roof pitch, slope angle, and rafter length quickly for accurate roofing calculations and planning.
Get your roof’s total surface area in square feet in seconds the single most important number for ordering any roofing material accurately.
Estimate the exact number of metal panels, fasteners, and total cost for your roof works for standing-seam, corrugated, and ribbed profiles.
Know precisely how many shingle bundles and squares you need, waste included, so you finish the job without a costly second trip to the supplier.
Calculate truss dimensions, spacing, and member lengths for roof framing projects with fast and reliable estimates.
Work out how many feet of gutters and downspouts your roof needs for proper drainage and to prevent water damage to your foundation.
Get accurate roofing estimates in three simple steps no signup, no complicated measurements.
Input your roof size, dimensions, and pitch. Even rough estimates work you can always refine the numbers later for a more exact result.
Every calculator uses the same pitch multipliers, waste factors, and coverage rates that professional estimators apply on real jobs — not rounded guesses.
Simple enough for a first-time DIY homeowner, detailed enough for contractors pricing a full job. You choose how deep you go.
We show you the math — area, waste allowance, and per-square-foot breakdown — so you understand exactly how your estimate was calculated.
Use every calculator instantly. No account, no email, no stored data. Your numbers stay yours.
Calculate from the job site on your phone or plan from your desk — fully free, no limits, on any device.
Download a professional PDF report with roofing measurements, material estimates, and project costs to save, print, or share
Explore helpful roofing tips, how-to guides, measurements, materials, and expert advice for smarter roofing projects.
Here is how to measure a roof for shingles in four steps. Find your building’s exterior length and width. Add your eave overhang. Apply a pitch correction for slope. Convert
A low pitch roof has a shallow slope. It generally sits between flat and a standard 4:12 pitch. It needs different materials, ventilation, and waterproofing than a steep roof. Most
The most common types of roof trusses are Fink, Howe, Scissor, Attic, Mono, Queen Post, King Post, and Hip trusses. The right one for your project depends on a few
Most homes can hold about 20 pounds of snow per square foot before the roof feels stressed. That works out to roughly 4 feet of fresh, fluffy snow. Or about
The six main types of gutter guards are micro-mesh, mesh, screen, foam, brush, and reverse-curve and the right one for your home depends mainly on the size of debris you
A gambrel roof design is the right choice when you want the most usable upper floor space for your money, which is why it dominates barns, storage sheds, and Dutch
Yes, all calculators on this site are completely free. No signup, no hidden charges, no subscription required.
Our calculators use standard roofing industry formulas. Results are accurate estimates for planning purposes, but actual material needs may vary slightly based on roof complexity and waste factor.
No account is needed. Simply enter your measurements and get instant results.
Yes, most calculators allow you to download a PDF summary of your results for sharing with contractors or for your own records.
Absolutely. Many contractors use our calculators for quick material and cost estimates before finalizing a project quote.
Browse our complete collection of roofing calculators built for homeowners, contractors, and builders.