How many bundles do I need?

Divide roof area by 100 for squares, multiply by bundles per square and add waste, then round up.

Does this include underlayment?

Yes, the estimate includes underlayment rolls when roll coverage is provided, but local code and manufacturer instructions control the final layer requirements.

How much waste should shingles use?

Use about 10% for simple roofs and more for hips, valleys, dormers or complex cuts.

Shingle Calculator

Calculate asphalt shingle bundles, roofing squares, starter, ridge caps, underlayment, nails, waste and material cost from roof area or dimensions.

Area input

Roof area

Roof area, sq ft

Shingle waste and coverage

Waste, %

Bundles per square

Roll coverage, sq ft

Linear roof edges

Ridge and hip length, linear ft

Eave length, linear ft

Material prices

Bundle price, $

Underlayment roll price, $

Nails price per lb, $

Typical asphalt shingle stack

Calculate shingle bundles from roofing squares

Shingle-calculator intent is a shopping-list estimate: roofing squares, bundles, starter shingles, ridge caps, underlayment rolls and nails, with waste included.

S q u a r es = \frac{R oo f A r e a _{f t^{2}}}{100}

B u n d l es = ⌈ S q u a r es \times B u n d l es P er S q u a r e \times (1 + W a s t e) ⌉

U n d er l a y m e n tR o l l s = ⌈ \frac{R oo f A r e a _{f t^{2}}}{R o l l C o v er a g e} ⌉

What the bundle count excludes

Starter, ridge caps and hip caps may be separate products from field shingles.
Ice barrier, flashing, ventilation, tear-off, decking repair and disposal are separate line items.
Product bundle coverage varies, so verify the label before buying.

Frequently Asked Questions

Sources and References

Calculations are based on the listed reference sources. Links open in a new tab.

Updated: May 29, 2026

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