Updated Roofing & Materials

Roofing Shingle Calculator

Estimate roof area, shingle bundles and squares, ridge caps, starter shingles, underlayment rolls, drip edge length and nail counts with this roofing shingle calculator.

Roof Area from Dimensions Shingle Bundles & Squares Full Roofing Materials Estimate

Roofing Shingle & Roof Material Estimator

Calculation Mode

Length Units Main field = feet or metres, extra field = inches or centimetres.

Roof Area Enter total sloping roof area from drawings, a take-off or the other modes.

Waste & Offcut Factor (%) Increase for complex roofs with many hips, valleys and penetrations.

Shingle Coverage per Bundle Typical three-tab shingles cover about 33.3 ft² per bundle of installed roofing.

Underlayment Coverage per Roll Many felt or synthetic underlay rolls cover roughly 200 ft².

Roof Shape

Building Length

Measured along the ridge or main run of the roof.

Building Width / Span

For a gable roof this is eave-to-eave; for a shed roof it is the horizontal run.

Pitch (rise per 12 of run) For a 6 in 12 roof, enter 6. Leave as is or adjust to match your roof pitch.

Waste & Offcut Factor (%)

Shingle Coverage per Bundle

Number of Roof Sections Sections with zero length or width are ignored. Up to 6 sections are available.

Section 1 Length

Section 1 Width / Span

Section 1 Pitch (rise per 12)

Section 2 Length

Section 2 Width / Span

Section 2 Pitch (rise per 12)

Section 3 Length

Section 3 Width / Span

Section 3 Pitch (rise per 12)

Section 4 Length

Section 4 Width / Span

Section 4 Pitch (rise per 12)

Section 5 Length

Section 5 Width / Span

Section 5 Pitch (rise per 12)

Section 6 Length

Section 6 Width / Span

Section 6 Pitch (rise per 12)

Waste & Offcut Factor (%)

Shingle Coverage per Bundle

Roof Area Use the result from the roof area modes or your own take-off.

Waste & Offcut Factor (%) Higher for complex roofs with many hips, valleys and detailing.

Shingle Coverage per Bundle Effective installed coverage per bundle in ft².

Underlayment Coverage per Roll

Ridge Length

Total length of all ridges to be capped.

Ridge Cap Coverage per Bundle Typical ridge cap coverage is around 30–35 linear feet per bundle.

Eave Length for Starters

Total eave length where starter courses are installed.

Starter Coverage per Bundle Approximate linear feet of eave covered per bundle of starters or cut shingles.

Drip Edge Perimeter Length

Total linear length along eaves and rakes where drip edge will be installed.

Drip Edge Length per Piece Common drip edge pieces are around 10 ft long.

Nails per Roofing Square Estimate nails per 100 ft² of roofing, based on shingle size and nail pattern.

Roofing Shingle Calculator

Roofing Shingle & Roof Material Estimator

Roof Area & Slope Summary

Shingle Bundles & Squares

Materials, Rolls, Caps & Nails

Planning Notes & Assumptions

Roofing Shingle Calculator

Roofing Shingle & Roof Material Estimator

Roof Area & Slope Summary

Shingle Bundles & Squares

Materials, Rolls, Caps & Nails

Planning Notes & Assumptions

Related Calculators