Roofing Calculator

Turn roof measurements into shingle bundles, then take the same material list into your quotes.

Your measurements

Editable example

Use the unit on each label. You can also type feet and inches with ft and in, or the marks on your tape measure.

Roof section 1

Footprint length (ft)Footprint width (ft)Pitch rise, in 12

Measure fromLength unitsChanges the dimensions labeled ft or m without a fixed unit. Thickness, openings and package sizes keep the inches, square feet, cubic feet and gallons shown on their labels.Extra for cuts (%)

Package sizes, prices and materials

Shingle coverage per bundle (sq ft)Change this to the coverage on your shingles.Your price per bundle ($)Underlayment coverage per roll (sq ft)Total eaves (ft)Total rakes (ft)Ridges and hips (ft)Usable drip-edge length per piece (ft)Ridge-cap coverage per pack (ft)Nails per square from fastening scheduleNails per boxSheathing area to replace from plan (sq ft)Sheathing coverage per sheet (sq ft)Required net free ventilation area from design (sq in)Net free area per vent (sq in)

Example: replace these measurements

Your material list

42 shingle bundles

1,252.2 sq ft measured

Shopping list & save options

Sloped roof area: 1,252.2 sq ft
With your cut allowance: 1,377.42 sq ft
Roofing squares: 13.77
Shingle subtotal: Add your bundle price
Underlayment rolls: Add roll coverage
Drip-edge pieces: Add edge measurements
Ridge-cap packs: Add ridge measurements
Nail boxes: Enter fastening and package counts
Replacement sheathing sheets: Enter both measurements
Vents from supplied design: Enter both measurements

Length and width are the horizontal footprint, including overhangs. Pitch adds the slope. Shown section only; roof details need a measured plan.

The calculation

Section 1: 1,120 sq ft × 1.118 = 1,252.2 sq ft
1,252.2 × (1 + 10/100) ÷ 33.3333 = 41.32 bundles before rounding.

Material price trends, separate from your quote

These U.S. producer indexes track material prices over time. They are not store prices, labor rates or local installed costs. We do not use them to increase a historical project median.

Historical household spending: the national 2023 AHS median for roofing was $10,000. Roofing projects across differing roof sizes, materials and scopes. Area and material are not held constant. This broader category does not price your specific job.

Prepared asphalt and tar roofing and siding products

+3.9% from August 2025 to August 2026. Latest observation is preliminary and may be revised.

BLS producer index, not seasonally adjusted
Period	Index level, not dollars
August 2025	360.038
August 2026	374.098

U.S. Bureau of Labor Statistics · Updated 2026-09-20. Use your quoted unit price in the material calculator; delivery, tax, preparation and labor remain separate.

Plan the work as well as the order: Roof installation & repair: What to check in the plan.

Before ordering, use the roof measurement, waste & material handoff guide to check the inputs and take the right questions to the supplier. Choose another calculator.

How to plan the quantity

Measure the horizontal footprint of each roof section, including overhangs. Use the pitch of that section, not the height of the whole house. A second story does not double the roof footprint.

The pitch factor turns the horizontal area into sloped roof area. Add your allowance for cuts, divide by the coverage per bundle, then round up to whole bundles. Starter strips, valley treatment and flashing need their own measured lengths.

Eaves are the lower horizontal edges. Rakes are the sloped outer edges. Enter their combined lengths when you want drip-edge pieces. Use the usable coverage after overlaps, not the full length printed on a piece.

Before you order

This is a roof-covering list. Rotten decking, tear-off, labor, disposal, permits, ventilation and flashing are separate quote items.
Split different pitches into separate sections. Hips, valleys, dormers and openings need a measured plan; an area allowance does not design their details. Use existing plans or a professional measurement instead of climbing onto a roof.