Measure first
Use actual roof dimensions and pitch rather than relying only on building footprint when the calculator asks for roof slope.
DIYGAUGE CALCULATORS
Roofing & Exterior
Estimate roofing, shingles, siding, gutters and exterior materials.
Roofing & Exterior
Roofing Calculator
Estimate sloped roof area, roofing squares and approximate shingle bundles.
Roofing & Exterior
Roof Pitch Calculator
Calculate roof pitch, slope percentage and angle.
Roofing & Exterior
Shingle Calculator
Estimate roofing shingle bundles and squares.
Roofing & Exterior
Metal Roofing Calculator
Estimate metal roofing panels from roof dimensions.
Roofing & Exterior
Siding Calculator
Estimate siding area, squares and material cost.
Roofing & Exterior
Gutter Calculator
Estimate gutter length and sections from roof-edge dimensions.
Roofing & Exterior
Downspout Calculator
Estimate downspout quantity from gutter length and spacing.
BETTER INPUTS, BETTER ESTIMATES
Plan Roofing & Exterior projects with fewer surprises
Roof area, pitch, shingles, metal panels, siding, gutters and downspout planning.
Use project-specific values
Where a calculator asks for coverage, yield, spacing, density, package size or price, use the value from the actual product or quote whenever possible.
Verify before ordering
Roofing and exterior work can be safety- and code-sensitive. Treat quantities as planning estimates and verify installation requirements locally.
One estimating standard across DIYGaugeSee how units, waste, rounding and purchase quantities are handled.View methodology →