How many bundles of shingles do you need?
Enter the roof area and a waste factor. We’ll tell you the squares to order and the bundles to put on the truck — so you don’t come up short on the roof.
Roof area
Use the total roof surface area you measured.
Total surface area of the roof, including all slopes.
That’s 22.0 squares before waste.
Extra material for cuts, hips, valleys, and starter. 10% simple, 15% typical, 20% complex.
76
Bundles to order
26
Squares to order
The math
- Roof area in squares
- 22.0
- With 15% waste
- 25.3 squares
- Bundles (3 per square, rounded up)
- 76
This assumes standard 3-tab or architectural shingles at 3 bundles per square. Heavier or specialty shingles can run 4–5 bundles per square — check the bundle coverage on the wrapper. Starter strip, hip-and-ridge cap, and underlayment are ordered separately.
How the shingle calculation works
Roofing is measured in squares, where one square covers 100 square feet of roof. This calculator converts your roof area into squares, then adds a waste factor for the shingles you’ll cut and discard around hips, valleys, rakes, and penetrations.
Most asphalt shingles are packaged at three bundles per square, so we multiply your squares-with-waste by three and round up — you can’t buy a partial bundle, and it’s better to have a little left over than to stop mid-roof for one more bundle.
Remember to order starter strip and hip-and-ridge cap separately, plus underlayment, drip edge, and fasteners for the full system.
Need a full price, not just a material count? Try the roof replacement cost calculator or build a quote with the free estimate template.