Asphalt Shingle Calculator
Calculate shingle bundles, squares, weight, and total installed cost — including starter strips, ridge cap, and tear-off.
How it works
Enter roof dimensions
Input length, width, and pitch — or total square footage if you know it.
Add waste factor
Select 10–15% for simple roofs, up to 20% for complex hips and valleys.
Get squares and bundles
See how many roofing squares, shingle bundles, and nails you need to buy.
Frequently Asked Questions
How many bundles of shingles do I need?
Divide your roof area by 100 to get squares, multiply by your waste factor (1.10–1.20 depending on complexity), then multiply by 3 bundles per square. Example: 2,000 sq ft ÷ 100 = 20 squares × 1.10 = 22 squares × 3 = 66 bundles.
What is the difference between 3-tab and architectural shingles?
3-tab shingles are flat single-layer strips costing $350–$550 per square installed, with a 15–20 year lifespan. Architectural (laminated) shingles are multi-layer, last 25–30 years, and cost $450–$700 per square installed. The modest price difference makes architectural shingles the standard choice for most homeowners.
How much does asphalt shingle installation cost per square?
Asphalt shingle installation costs $350–$550 per square for 3-tab and $450–$700 per square for architectural shingles. A roofing square equals 100 sq ft. A typical 2,000 sq ft home roof (about 20–25 squares) costs $9,000–$17,500 fully installed including tear-off, underlayment, and disposal.
What waste factor should I use for shingle calculations?
Use a 10% waste factor for simple gable roofs with few valleys or hips. Use 15–20% for complex roofs with multiple valleys, dormers, skylights, or steep pitches. Always order at least 10% extra to account for cuts and potential future repairs with matching shingles.