How many shingles do I need?
Bundles = squares x bundles per square
Example: 1,800 sq ft of roof with 10% waste is 19.8 squares. At 3 bundles per square, order 60 bundles. Most suppliers sell by the bundle and let you return full unopened ones.
Coverage by product
| Item | Typical coverage |
|---|---|
| Architectural shingle bundle | 33.3 sq ft |
| 3-tab shingle bundle | 33.3 sq ft |
| Starter strip bundle | 100 to 120 linear ft |
| Hip and ridge cap bundle | 20 to 33 linear ft |
| Synthetic underlayment roll | 1,000 sq ft (10 squares) |
| Ice and water shield roll | about 200 sq ft |
| Drip edge | 10 ft per piece |
Want a pro to confirm these numbers?
Numbers look right? A licensed roofer can measure on site and give you an exact price.
Nails per square
Most shingles need 4 nails each. High-wind zones and steep slopes call for 6. Plan for about 320 nails per square at 4 per shingle, and 480 at 6. A 7,200 count coil box covers about 22 squares at 4 nails.
Ordering tips
- Buy all bundles from the same lot number so the color matches.
- Do not count ridge cap from cut 3-tabs if you use architectural shingles. Buy matching ridge cap.
- Keep two spare bundles for future repairs.
- Check the shingle maker's install guide. It controls the warranty.
Sources and further reading
- Asphalt Roofing Manufacturers Association (ARMA)
- 2021 International Residential Code, Chapter 9: Roof Assemblies
- National Roofing Contractors Association (NRCA)
Frequently asked questions
How many bundles of shingles for a 2,000 sq ft roof?
20 squares plus 10% waste is 22 squares, so 66 bundles of standard 3-bundle shingles.
How many square feet does a bundle cover?
About 33.3 sq ft for standard 3-bundle-per-square shingles.
How much ridge cap do I need?
Add the length of every ridge and hip, then divide by the coverage on the bundle, usually 20 to 33 ft.
Do I need ice and water shield?
Building codes require it at the eaves in cold climates where ice dams form, and it is smart in valleys and around chimneys anywhere.