PitchCalc
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Shingle Calculator

Turn a known roof area into waste-adjusted squares and full shingle bundles. This page does not start from a building footprint.

Convert area into bundles

Start from a known roof area. Waste is added, then bundles round up.

Measurements stay in your browser
1Roof area
sq ft

Use sloped area, not the building footprint.

Example area (a 30 × 40 ft roof at 6/12).

Need area first? Open the roof area calculator or the roofing calculator.

2Waste allowance
%

10% is a common starting point for a simple roof.

Coverage and optional price
sq ft

From the product packaging.

USD

Materials only.

Shingle calculator FAQ

Waste, coverage, and rounding are the usual sources of a bad material count.

How do I calculate how many shingle bundles I need?

Start with the sloped roof area, add a waste allowance, then divide by the coverage printed on the bundle. This calculator always rounds up to a whole bundle.

Why can I edit coverage per bundle?

Three bundles per square is a common default, but packages are not identical. Use the coverage from the product you are buying rather than treating 33.33 sq ft as a universal rule.

Is the dollar amount a full project price?

No. An optional price per bundle produces a materials-only subtotal. Labor, tear-off, underlayment, and disposal are excluded.