Free Roofing & Gutter Calculators

Calculate chemical dosages, equipment sizing, water volume, and operating costs for your roofing project — all for free. No signup, no guesswork.

Browse by Category

Roof Materials & Area

Roof area calculators, shingle and metal panel estimators, pitch converters, underlayment sizing, and ventilation tools.

8 calculators

Gutters & Drainage

Gutter length estimators, downspout sizing, gutter guards, rain barrels, French drains, and slope calculators.

7 calculators

Cost & Labor

Roof replacement and repair cost estimators, material comparisons, ROI calculators, flashing, and labor time estimates.

8 calculators

Structural & Climate

Roof load calculators, snow load, wind uplift, insulation R-value, lifespan estimators, solar compatibility, and ice dam risk.

7 calculators

Popular Calculators

Roof Area Calculator

Calculate your total roof area from the building footprint and roof pitch, accounting for overhangs and complexity.

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Shingle Calculator

Calculate how many bundles and squares of shingles you need for your roof, including waste factor.

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Metal Roofing Panel Calculator

Calculate the number of metal roofing panels needed based on your roof dimensions and panel width.

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Roof Pitch Calculator

Convert between roof pitch (rise/run), degrees, and percentage. Find the pitch factor for area calculations.

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Gutter Length Calculator

Calculate the total linear feet of gutters needed for your home, including corners, end caps, and joiners.

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Roof Replacement Cost Estimator

Estimate the total cost of a roof replacement including materials, labor, tear-off, and disposal.

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Roof Repair Cost Calculator

Estimate the cost of common roof repairs including leak fixes, damaged shingles, flashing, and small section replacements.

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Roofing Material Comparison

Compare different roofing materials side by side on cost, lifespan, weight, energy efficiency, and maintenance.

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Snow Load Calculator

Calculate the weight of snow on your roof based on snow depth, density, and roof area to assess structural risk.

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Roof Lifespan Estimator

Estimate your roof remaining lifespan based on material, age, climate, maintenance, and visible condition.

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