Free roofing tool

Shingle calculator (bundles & squares)

Find how many roofing squares and shingle bundles your roof needs, with waste included.

Enter your roof area to see how many roofing squares and shingle bundles you need. Roofers price in squares (100 sq ft), and shingles come three bundles to a square.

Roof area (sq ft) Waste factor (%) Use ~10% for simple roofs, ~15–20% for cut-up roofs with lots of valleys.

Roofing squares needed

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Order a little extra for waste, hips, and valleys. A pro confirms exact counts.

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How shingle math works

A roofing square is 100 sq ft of roof. Most 3-tab and architectural shingles come 3 bundles per square. Always add a waste factor — about 10% for a simple gable roof, and 15–20% for a complex hip roof with many valleys. See what is a roofing square.

Cost ranges reflect 2026 U.S. installed prices (BLS producer/labor data, Remodeling Cost vs. Value, and manufacturer pricing). Your real price depends on your roof, region, and pro — see the full cost guide.

FAQ

Shingle Calculator questions

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How many bundles of shingles do I need?

About 3 bundles per roofing square (100 sq ft), plus a waste factor. A 2,400 sq ft roof is 24 squares, or roughly 72–80 bundles including waste.

What is a roofing square?

A square equals 100 square feet of roof surface. Roofers quote and order materials in squares, not square feet — see our full explainer.

How much waste should I add?

Add about 10% for a simple roof and 15–20% for a cut-up roof with hips, valleys, and dormers, which need more cuts.

Does this include starter and ridge cap?

No — this counts field shingles. Budget extra bundles for starter strip and ridge cap, which a pro adds to the order.

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