How many bundles of shingles per square?

Standard 3-tab and most architectural shingles require 3 bundles per square (100 sq ft). Some premium heavy shingles may require 4 bundles per square.

How do I calculate roof area?

Measure your house footprint length × width, then multiply by your roof slope factor. For a 6/12 pitch, multiply by 1.118. For a 4/12 pitch, multiply by 1.054.

How long do architectural shingles last?

Quality architectural shingles carry 30-year warranties and typically last 25–30 years in most US climates with proper installation and ventilation.

Shingle Calculator

Calculate the number of shingle bundles needed to cover your roof area.

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Enter Your Measurements

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How to Use This Calculator

1Calculate total roof area including all slopes.
2Enter in square feet.
3Click Calculate — result shows bundles (3 bundles = 1 square = 100 sq ft).

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About This Material

Standard 3-tab or architectural (dimensional) shingles come in bundles covering approximately 33.3 sq ft each. 3 bundles = 1 roofing square = 100 sq ft. Architectural shingles are preferred for their longevity (30-year warranty) and appearance.

Installation Tips

•Start from the eave, working up to the ridge.
•Offset vertical joints by 6" minimum between courses.
•Use 4 nails per shingle in standard conditions, 6 in high-wind areas.
•Install ridge cap shingles separately (sold in separate bundles).

Common Mistakes to Avoid

Not adding waste — always order extra for ridge cap, hips, and valleys.
Under-nailing in high-wind zones.
Not using ice and water shield in the first 2 feet from eave in cold climates.