Free Roofing Calculator - Shingles, Squares & Cost (2026)

Shingles are sold in bundles, and 3 bundles cover one roofing square (100 sq ft) for standard 3-tab or architectural shingles. First calculate your actual roof area (footprint x pitch multiplier), divide by 100 to get squares, then multiply by 3 for bundles. Always order 10-15% extra for waste and cuts. Order starter strip and ridge cap separately by linear foot.

A new asphalt shingle roof typically costs $6,000 to $18,000 for a 1,500-2,500 sq ft home in 2026. Architectural shingles run $100-$150 per square for materials plus $150-$300 per square for labor. Metal roofing materials cost significantly more at $350-$700 per square but last 40-70 years versus 15-30 years for shingles.

A roofing square is the industry standard unit equal to 100 square feet of roof area. Roofers price materials and labor per square rather than per square foot. For example, a 2,000 sq ft roof equals 20 squares. This standardized unit makes it easier to compare bids and estimate materials.

Steeper roofs have more surface area than their flat footprint. A 6/12 pitch adds about 12% to the footprint area, while a 12/12 (45-degree) pitch adds 41%. Steeper roofs also require more labor time and safety equipment, which adds to installation cost, though the exact premium depends on the roof and the crew.

Architectural (dimensional) shingles are the better value for most homeowners. They cost only $10-$50 more per square than 3-tab but last 25-30 years versus 15-20 years and provide a more attractive layered appearance. Check the manufacturer's rated wind speed for the specific product you are quoting; it varies by product line, not just by shingle type.

A 1,500 sq ft footprint at a 6/12 pitch results in about 1,680 sq ft of actual roof area, or 16.8 squares. At a steeper 9/12 pitch, the same footprint becomes about 18.8 squares. Add 10% for waste on a simple roof, 15-20% total on roofs with hips, valleys, dormers, or skylights. For a 6/12 roof at 10% waste, order about 56 bundles (16.8 squares x 1.10 x 3). Use the calculator above for your exact pitch and footprint.

Labor to install asphalt shingles typically runs $150 to $300 per square depending on pitch, region, and whether tear-off is included. A simple 20-square re-roof on a ranch home runs $3,000-$6,000 in labor. Steeper roofs cost more in labor because of slower work and added safety setup. Tear-off and disposal is often priced as a separate line per square, so confirm it is in every bid you compare.

Add 10% waste for a simple rectangular roof. Add 15-20% total on roofs with hips, valleys, dormers, or skylights, since every angle cut generates scrap. Order starter strip and ridge cap separately -- they are not covered in the bundle count. Measure the linear feet of all eaves (for starter) and all ridges and hips (for ridge cap). Running short on material mid-job is one of the most expensive mistakes in roofing.

A complete re-roof needs: architectural or 3-tab shingles, synthetic underlayment (or 15 lb felt), ice and water shield for the first 3-6 ft from eaves and any code-required valley coverage, starter strip, ridge cap shingles, galvanized roofing nails long enough to penetrate the deck as required by the shingle manufacturer and your local code (longer nails when going over an existing layer), drip edge, and step flashing around any penetrations. Many jurisdictions with ice-dam history require an ice barrier at the eaves; check your local code for where and how far it must extend.

A 2,000 sq ft footprint at a 6/12 pitch works out to about 2,240 sq ft of actual roof area, or 22.4 squares. At 3 bundles per square plus a 10% waste factor, that is roughly 74 bundles. Bump the waste to 15-20% on roofs with hips, valleys, dormers, or skylights, which pushes you closer to 78-81 bundles. Run your exact footprint and pitch through the shingle calculator to get the bundle count for your roof.

Most standard 3-tab and architectural bundles cover about 33 sq ft, so 3 bundles cover one roofing square (100 sq ft) for either type. Piece count per bundle and bundles per pallet vary by manufacturer and product line, so check the wrapper or ask your supplier. Always order by the square, not the piece, so your count matches how suppliers and crews price the job.

If 2,000 sq ft is the measured roof surface, that is exactly 20 squares (a square is 100 sq ft). But if 2,000 sq ft is your house footprint, apply the pitch multiplier first: at 6/12 the roof area is about 2,240 sq ft, or 22.4 squares, and at 9/12 it climbs to roughly 25 squares. The difference between footprint and sloped area is the single biggest source of short orders, so always confirm which number your measurement is.