Roofing Shingles Calculator
Roofing materials are sold in squares (100 sq ft) and bundles (≈33.3 sq ft). Enter your roof dimensions and pitch to calculate how many bundles of architectural shingles you need, plus ridge cap and nails.
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Top PickOwens Corning Duration Shingles — Home Depot~$34.98/bundle* Affiliate links — we may earn a commission at no cost to you.
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How to Use This Calculator
- 1Enter your measurements in the fields above. Use the units shown next to each field (ft, in, etc.).
- 2Click Calculate to get your material estimate instantly.
- 3Review the highlighted result — it shows the key quantity you need to order.
- 4Use Copy Results to save your estimate, or bookmark the URL — your inputs are encoded in the link.
Pro tip: Always add 10% to your material order to account for waste, cuts, and defects.
Frequently Asked Questions
How many bundles of shingles do I need for a 1,500 sq ft roof?
A 1,500 sq ft flat (projected) roof area requires 15 squares. At 3 bundles per square for architectural shingles, that's 45 bundles before waste. With 10% waste factor for a gable roof — or 15% for hip and valley cuts — budget 50–52 bundles. At roughly $35/bundle, that's $1,750–$1,820 in shingle materials.
What's the difference between a square and a bundle of shingles?
A roofing square is 100 square feet of roof surface. Shingles are sold in bundles, with 3 bundles making one square for standard 3-tab and most architectural shingles. Some heavyweight architectural shingles come 4 bundles per square. Check your specific product's label — it will state square footage per bundle.
How does roof pitch affect shingle quantity?
Roof pitch increases the actual surface area relative to the footprint. A 4/12 pitch roof has a slope multiplier of 1.054 (5.4% more area than flat). An 8/12 pitch has a multiplier of 1.202 (20% more area). The calculator automatically applies the correct pitch multiplier — steeper roofs need more shingles than the floor plan suggests.
How many squares of roofing do I need for a 2,000 sq ft house?
For a 2,000 sq ft house with a standard 6/12 gable roof, the actual roof surface is roughly 2,200–2,400 sq ft depending on overhang, so about 22–24 squares. At 3 bundles per square plus 10% waste, budget for 72–79 bundles. A hip roof of the same house needs 15–20% more shingles due to additional hip and valley cuts.