Roofing Squares Calculator

Free result — no account.

Formula

Squares = (roof area × pitch factor × (1 + waste%)) ÷ 100. One square = 100 sq ft.

Worked example

1800 sq ft footprint factor 1.1, 10% waste → about 21.8 squares.

Source & last checked

Roofing industry square = 100 sq ft

Last checked: 2026-09-25

FAQ
Is this exact?

No — estimates only. Verify official sources.

Do you store my numbers?

No — it runs in your browser.

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