Roofing, siding & coatings

Exterior calculators for roofing, siding and protective coatings.

Estimate roof shingles, sheathing, simple rafter geometry, siding cartons, deck stain, and fence stain while keeping product coverage and safety limits visible.

Choose the right tool

Exterior projects combine measured planes, slopes, laps, exposure, coatings, and weather-sensitive product instructions. These tools plan material quantities; they do not prove structural adequacy or weather-tight detailing.

Exterior · Area & cartonsSiding CalculatorEstimate siding cartons from walls, gables, openings, and package coverage.Exterior · Squares & bundlesRoof Shingle CalculatorEstimate roofing squares and shingle bundles from plan area and roof slope.Exterior · Area & sheetsRoof Sheathing CalculatorEstimate roof panel count from plan area, slope factor, and net sheet coverage.Exterior · Length & geometryRafter Length CalculatorCalculate simple common-rafter geometry and total stock length without structural sizing.Exterior · Gallons & litersDeck Stain CalculatorEstimate deck stain from floor and rail area, coats, coverage, and waste.Exterior · Gallons & litersFence Stain CalculatorEstimate stain for one or both fence faces with coats and product coverage.

Before calculating

Three checks for a better estimate.

01Measure every plane

Separate roof faces, gables, walls, rails, stairs, and trim so slope and coating assumptions are applied to the correct surfaces.

02Use product coverage

Bundles, cartons, panels, and coatings have product-specific net coverage. Replace every example value with the selected label.

03Verify the assembly

Flashing, underlayment, ventilation, fasteners, structural sizing, and local wind or fire requirements sit outside a quantity estimate.