What is Roofing Calculator?

Estimate roofing materials for your project by entering roof dimensions and pitch. Calculates the number of shingle bundles, squares, underlayment rolls, ridge caps, and nails needed, with waste factor included.

How to use

1. Enter your roof length, width, and select the roof pitch (rise over run).
2. Choose the roofing material type and set the waste percentage (10–15% typical).
3. Review the materials list with quantities and download or print the estimate.

Result

A 40×30 ft ranch house with 6/12 pitch: roof area = 1,342 sq ft (with pitch factor). Needs 14 squares, 42 bundles of 3-tab shingles, 5 rolls of underlayment, and ~28 lbs of nails.

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