How does the Roof Shingles Calculator work?

Measure the footprint area of the roof from below (length × width of house) Then: Apply pitch multiplier: 4/12 pitch = ×1.054, 6/12 = ×1.118, 8/12 = ×1.202 Then: Add 10–15% waste allowance for valleys, hips, and ridges Then: 1 square = 100 sq ft; most shingle bundles cover 33 sq ft → 3 bundles per square.

Can you give an example of how to use the Roof Shingles Calculator?

Example: Input Footprint 1,200 sq ft · 6/12 pitch · 10% waste gives a result of 15 squares (45 bundles) (1200×1.118×1.1÷100=14.75 squares).

Is the Roof Shingles Calculator free to use?

Yes — completely free with no registration, download, or subscription required. All calculations happen instantly in your browser.

How accurate is the Roof Shingles Calculator?

Our Roof Shingles Calculator uses verified mathematical formulas and is accurate to multiple decimal places. Results are calculated in real-time using the same methods used by professionals.

Pratico

Roof Shingles Calculator

Roof length (m)

Roof width (m)

Pitch (rise/run)

e.g. 4 = 4:12

A roof shingles calculator estimates the number of shingles or tiles, and the number of "squares" (100 sq ft / 9.29 m²), needed to cover a roof. It accounts for pitch, waste, and overlap.

References

›Roof shingles — Wikipedia

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Roof Shingles Calculator

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