Roof shingle calculator

Region and unitsSwitching region converts your measurements and reloads that region’s cost presets. Your numbers stay in this browser only.

Roof section

Name (optional)Printed on the materials list, e.g. Main roof, Garage.Shape

Length along the ridge (ft)ftFootprint of this section, measured on the plan or the ground.Width, eave to eave (ft)ftAcross the slopes, wall to wall.

Eave overhang, each side (ft)ftAdded on every side of the footprint. 0 if you measured the roof edge itself.Pitch (rise per 12 of run)x:126 means 6:12. Use the pitch calculator to convert degrees.

Shingle type

3 bundles per square, 64 shingles per square (Owens Corning, Section 07 31 13 specification guide, 2013, TruDefinition Oakridge shingles, read 2026-09-20). Heavier shingles take 4 to 5 bundles per square: Owens Corning Duration Premium 4 bundles of 16, Berkshire 5 bundles of 9; IKO Crowne Slate 4, Armourshake 5. Check the bundle wrapper.

Waste (%)%Starting value: IKO, Blueprint for Roofing, read 2026-09-20; edit it.

Underlayment

10 squares per roll (Owens Corning, Section 07 31 13 specification guide, 2013, Deck Defense synthetic underlayment, read 2026-09-20).

Ridge cap shingles

25 linear ft per bundle (Superarbor, GAF Seal-A-Ridge hip and ridge cap shingles, read 2026-09-20).

Installed cost, per square ($)Material

Low ($ per square)$Starting value: HomeAdvisor, "How Much Does a Roof Replacement Cost?", updated 17 June 2026, table "Roofing Material | Average Cost", read 2026-09-20; edit it.High ($ per square)$Installed, tear-off not included. Leave both empty for quantities only.

Result

Roof area: 1,342 sq ft
Roofing squares: 13.4 squares
Bundles to order (10% waste): 45 bundles
Squares to order, waste included: 14.8 squares
Underlayment: 2 rolls
Ridge cap (40 ft of ridge and hips): 2 bundles
Roofing nails: 3,435 nails, about 18.6 lb
Drip edge (147 ft of eaves and rakes): 15 pieces of 10 ft
Installed cost range: $5,367 to $8,050
Plan area (footprint with overhang): 1,200 sq ft

Bundles, rolls and pieces are rounded up to what you buy. Nails are counted on the roof as laid (64 shingles per square x 4 nails); the cost is the installed price per square times the roof area, so waste is not priced twice. Planning quantities from manufacturer coverage figures and published cost ranges, each with its source and date: measure the roof and follow the product data sheet. Not a structural assessment.

Free calculator by RoofTally. Open the full version for the materials list, the guide and the sources. Planning quantities, not a survey.