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Roofing Calculator: Squares from Roof Area

Enter the area you measured and the roof pitch. This tool converts it into roofing squares — the unit every roofer quotes in — and shows what those squares cost in your market.

Model reviewed August 2026

Select a state to re-price the estimate with local labor and material costs.

Ground footprint under the roof, or the sloped surface if you measured on the roof.

10% for a simple gable roof, 15% for a cut-up roof with many valleys and hips.

National baseline for architectural shingles. Pick a state above to re-price it.

Roofing squares

26.9

1 square = 100 sq ft of roof surface

Squares to orderIncludes 10% waste
29.6 squares
Roof surface area
2,688 sq ft
Shingle bundles (3 per square)
89 bundles
Estimated installed costMaterials and labor, before tear-off and permit
$16,913 – $24,024

Estimates only. Local pricing, site conditions and code requirements change the real number.

The formula

Squares = (area x pitch multiplier) / 100; Squares with waste = squares x (1 + waste %)

One roofing square is exactly 100 square feet of roof surface. If you measured the ground footprint rather than the sloped roof, the pitch multiplier converts it to actual surface area; if you already measured on the roof, choose the flat option.

Worked example

A 2,400 sq ft footprint at a 6:12 pitch works out to about 2,688 sq ft of roof surface, which is 26.9 squares — 29.6 squares once a 10% waste allowance is added, or roughly 89 bundles of shingles.

Frequently asked questions

How many square feet is a roofing square?

Exactly 100 square feet of roof surface. A 30-square roof is 3,000 square feet of sloped surface, not floor area.

How do I calculate roofing squares from my house size?

Multiply the ground footprint by a pitch multiplier (about 1.06 for a low slope, 1.12 for a 6:12, 1.25 for an 8:12 and up to 1.4 for very steep), then divide by 100.

How many squares is a 2,000 sq ft roof?

A measured 2,000 sq ft roof surface is 20 squares. A 2,000 sq ft footprint usually works out to 21 to 28 squares once pitch and overhangs are counted.

How many bundles of shingles per square?

Three bundles cover one square for standard 3-tab and architectural shingles. Heavier designer and premium shingles can take four or five bundles per square.

Should I add waste to my square count?

Yes. Order 10% extra on a simple gable roof and 15% on a roof with multiple valleys, hips, dormers or skylights so cuts and starter courses do not leave you short.

Price this job in your state

Same tool, re-priced with local labor, material and permit-fee indexes.

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Sources

Sources & verification

Model vintage August 2026. The links above are the issuing agencies' own pages — we publish them so you can confirm the current rule yourself, not as evidence that each fact on this page was re-checked with them today. Cost figures are modeled estimates based on national baselines adjusted for local labor and material pricing, not quotes. Permit rules change; confirm with the building department before starting work.