Shingle Calculator: Estimate Bundles, Squares & Cost

Use this free shingle calculator to find out how many shingle bundles and squares you need for your roof, plus an estimated material cost. Enter your roof dimensions, pitch, and shingle type to get an instant breakdown.

Roof Length (ft)

Roof Width (ft)

Number of Roof Planes / Sides

Roof Pitch (Rise per 12in Run)

Shingle Type

Price per Square ($) – optional

Waste Factor (%)

How to Use This Calculator

Enter your roof's length and width (the footprint dimensions of your home). Select how many roof planes or sides your roof has - most homes have a simple gable roof with 2 sides, while hip roofs have 4. Choose your roof pitch using the rise-per-12-inches format - if you don't know your pitch, use our Roof Pitch Calculator first. Select a shingle type or enter your own price per square, then choose a waste factor based on your roof's complexity. Click Calculate to see squares, bundles, and estimated cost.

How Shingle Quantity Is Calculated

Shingles are sold in squares (100 sq ft of coverage) and bundles (typically 3 bundles per square). The calculator starts with your roof's footprint area, then applies a pitch multiplier - because a sloped roof has more surface area than the flat footprint below it. A steeper pitch means more actual roof area to cover, even if the footprint stays the same.

For example, a 40×30 ft footprint with a 6/12 pitch has a multiplier of about 1.06, giving a roof area of roughly 1,272 sq ft instead of the flat 1,200 sq ft. After adding a 15% waste factor for cuts and overlaps at hips, valleys, and edges, the area becomes about 1,463 sq ft, or 14.6 squares - rounded up to 14.6, requiring 44 bundles.

Diagram comparing a roof's flat footprint area to its actual surface area once roof pitch is applied

What Is the Average Cost of Shingles?

3-tab asphalt shingles, the most basic and budget-friendly option, typically cost $90-110 per square for materials alone. Architectural (dimensional) shingles are the most common choice for US homes today, offering better durability and a layered appearance, priced around $120-150 per square. Designer or luxury shingles, which mimic the look of slate or wood shake, can run $250-350 per square or more. For a typical 1,500 sq ft roof (about 15-17 squares with waste), material costs range from roughly $1,500 for 3-tab to $2,000-2,500 for architectural shingles.

Frequently Asked Questions

Most standard shingles come 3 bundles per square (100 sq ft). Some heavier designer or luxury shingles may require 4-5 bundles per square - check the manufacturer's coverage specs before ordering.

3-tab shingles are flat, uniform, and lightweight, offering a basic look at a lower price. Architectural shingles are thicker, layered, and more durable, with a dimensional appearance - most homeowners now choose architectural for better wind and weather resistance.

Yes. A steeper pitch increases the actual surface area compared to the footprint, and steep roofs often need a higher waste factor due to more complex cuts. This calculator accounts for both automatically based on your pitch selection.

10% works for simple gable roofs with few cuts. Use 15% for standard roofs, and 20-25% for roofs with multiple valleys, dormers, or hips where more cutting is required.