Shingle Calculator

The number depends on the shingle type. Standard 3-tab asphalt shingles come 26-29 per bundle. Architectural shingles are thicker, so they come 20-24 per bundle. Luxury and designer shingles range from 10-16 per bundle and vary widely by manufacturer. Despite the count difference, most asphalt bundles cover the same ~33.3 sq ft of roof area — that's why three bundles equal one roofing square (100 sq ft).

Three bundles cover one roofing square (100 sq ft) for standard 3-tab and most architectural shingles. Premium architectural and some luxury shingles need 4-5 bundles per square because of their thickness and weight. A roofing square is the industry standard unit for ordering — divide your roof area by 100 to get squares, then multiply by bundles-per-square to get total bundles needed.

Most asphalt shingle bundles cover approximately 33.3 sq ft of roof surface, regardless of whether they contain 22 or 29 individual shingles. This standardization is intentional — it makes the "three bundles per square" math work out cleanly. Specialty and luxury shingles can cover less per bundle (sometimes only 20 sq ft) due to their thickness, so always check the product label for "coverage per bundle" before ordering.

Three steps. First, measure your roof's surface area in square feet (use our Roof Square Footage Calculator if you haven't). Second, divide by 100 to get roofing squares — that's the industry unit. Third, multiply by 3 (for standard asphalt) to get bundles. Add 10-15% extra for waste from cuts and starter rows. For a 1,500 sq ft roof: 15 squares × 3 = 45 bundles, plus waste ≈ 50 bundles.

Multiply your roof area in square feet by 0.03 for a quick estimate. For a 2,000 sq ft roof, that's 60 bundles before waste. Add 10% for simple gable roofs, 15% for hip roofs or roofs with valleys and dormers. Standard asphalt shingles use 3 bundles per square; architectural premium and luxury shingles can need 4-5 bundles per square. Use the calculator above for exact numbers based on your specific shingle type.

3-tab shingles are flat, single-layer, and the most affordable option — typically lasting 20-25 years. Architectural (also called dimensional or laminated) shingles have multiple layers fused together, creating a thicker, more dimensional appearance — they last 30-50 years and weigh 50% more. Both come in bundles, but architectural shingles have fewer pieces per bundle (20-24 vs 26-29 for 3-tab) since they're thicker. Architectural shingles cost about 20-30% more but offer better wind resistance and curb appeal.

10% is a reasonable default for a simple gable roof. Use 12-15% if the roof has hips, valleys, dormers, or chimneys, since those features generate more cut-offs and starter rows. Steep roofs and complex shingle patterns can push waste up to 20%. Hip roofs commonly need 15% compared to 10% for gables. Leftover material isn't truly wasted — extra bundles are useful for future repairs and replacing storm damage.

The math is exact for the bundle-counting calculations it performs — divide area by coverage, multiply by adjustment factors. Real-world accuracy depends on input quality. Measure your roof carefully, verify your shingle product's actual coverage from the packaging label (it can vary), and pick a waste factor that matches your roof's complexity. For final material orders, cross-check with the supplier and consider ordering one extra bundle as a safety margin.

The calculator accepts roof area in square feet, but every area result and weight estimate shows the metric equivalent in parentheses. To convert your measurements: 1 square meter = 10.764 square feet, so a 100 m² roof is approximately 1,076 sq ft. Bundle counts and shingle quantities are universal — they don't change between US and metric units.