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Roofing
Roofing calculators for area, pitch, shingle materials, ventilation, snow load, and underlayment
Instant Answers
Pre-calculated results for common scenarios
roof area pitch
Small Shed 20×30 with 4:12 Gable RoofDetached Garage 24×36 with 4:12 Gable RoofSmall House 30×40 with 6:12 Gable RoofWorkshop 24×36 with 6:12 Gable RoofCabin 30×40 with 8:12 Gable RoofLarge Barn 40×60 with 6:12 Gable RoofLarge House 40×60 with 8:12 Gable RoofRanch House 50×30 with 6:12 Gable RoofTwo-Story Home 50×30 with 8:12 Gable RoofSmall House 30×40 with 6:12 Hip RoofCottage 30×40 with 8:12 Hip RoofLarge Home 40×60 with 6:12 Hip RoofExecutive Home 40×60 with 8:12 Hip RoofSmall Shed 10×12 with 3:12 Shed RoofGarden Shed 10×12 with 4:12 Shed RoofWorkshop 12×16 with 3:12 Shed RoofStudio Shed 12×16 with 4:12 Shed RoofRanch House 50×28 with 6:12 Gable RoofCape Cod 30×40 with 12:12 Gable RoofSmall Cabin 24×24 with 6:12 Gable Roof
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Roof Area and Pitch Calculator
Calculate roof surface area accounting for pitch and determine total square footage
IRC 2021 Section R905NRCA Roofing Manual
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Shingle Material Calculator
Estimate asphalt shingles, underlayment, and accessories needed for roofing projects
ASTM D3462 Asphalt ShinglesManufacturer Specifications
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Roof Ventilation Calculator
Calculate required attic ventilation area based on International Residential Code
IRC 2021 Section R806ASHRAE Standard 62.2
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Snow Load Calculator
Determine design snow loads for roofs based on location and roof characteristics
ASCE 7-22 Chapter 7IBC 2021 Section 1608
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Underlayment Calculator
Calculate roofing underlayment material requirements including felt and synthetic products
IRC 2021 Section R905.2.7ASTM D226 & D4869