How Many Bundles of Shingles Do I Need?
Shingles are sold by the bundle, but estimated by the square. Here is how to turn your roof area into roofing squares, then into the bundles of shingles to buy - with a quick table by roof size and the waste to add on top.
By the Calculate My Reno Team / Published
Skip to the tool
Open the Roof Shingle Calculator
Shingles are estimated by the square but sold by the bundle, so every estimate is a two-step conversion: roof area to squares, then squares to bundles. Get those two steps right and the order is just arithmetic.
Skip the math
Type your roof area or footprint and pitch into the roof shingle calculator and it returns the squares and the bundles, with waste and the starter and ridge cap added. The rest of this guide is how it works, so you can check the number.
The quick formula
squares = sloped roof area (sq ft) ÷ 100
bundles = ceil(squares × bundles-per-square × waste)
A roofing square is 100 sq ft of roof surface. Most shingles come 3 bundles to the square, so a bundle covers about 33 sq ft. Add 10% waste for a simple roof, more for a cut-up one, and round up to whole bundles.
How many bundles are in a square?
The packing depends on the shingle weight:
| Shingle type | Bundles per square | Coverage per bundle |
|---|---|---|
| Three-tab | 3 | ~33 sq ft |
| Standard architectural (laminate) | 3 | ~33 sq ft |
| Heavier architectural | 4 | ~25 sq ft |
| Designer / premium | 5 | ~20 sq ft |
Bundles by roof size
This is the field shingle count for a roof at 3 bundles per square, before and after a 10% waste allowance. The area here is the sloped roof surface, not the flat footprint:
| Roof area (sloped) | Squares | Bundles (3/sq) | With 10% waste |
|---|---|---|---|
| 1000 sq ft | 10 | 30 | 33 |
| 1500 sq ft | 15 | 45 | 50 |
| 2000 sq ft | 20 | 60 | 66 |
| 2500 sq ft | 25 | 75 | 83 |
| 3000 sq ft | 30 | 90 | 99 |
If you only measured the flat footprint, multiply it by the slope factor for your pitch first - see how to measure a roof for shingles and the roof pitch chart.
Do not forget the extras
The bundle count above is just the field. A full order also needs:
- Underlayment over the whole sloped area - a synthetic roll covers about 10 squares, 15 lb felt about 4.
- Starter strip along the eaves to lock down the first course, sized from the eave run.
- Ridge cap bent over the ridges and hips, sized from their combined length.
The shingle calculator counts all three alongside the field bundles.
Worked example
A 2000 sq ft sloped roof, architectural shingles at 3 bundles per square, with 10% waste:
- Squares: 2000 ÷ 100 = 20 squares.
- Field bundles: 20 × 3 = 60, × 1.10 waste = 66, so 66 bundles.
- Underlayment: 20 squares ÷ 10 per synthetic roll = 2 rolls.
- Add your starter and ridge cap by the linear foot.
Round every material up to whole units, and keep a couple of bundles spare.
Frequently asked questions
How many bundles of shingles do I need for 2000 square feet?
If 2000 sq ft is the sloped roof area, that is 20 roofing squares, and at 3 bundles per square that is 60 bundles - about 66 with a 10% waste allowance. If 2000 sq ft is the flat footprint instead, multiply it by the slope factor for your pitch first (about 1.12 for a 6:12 roof, so roughly 2240 sq ft, 22.4 squares, 74 bundles with waste).
How many bundles of shingles are in a square?
Most three-tab and standard architectural (laminate) shingles come 3 bundles to the square, so one bundle covers about 33 sq ft. Heavier architectural shingles run 4 bundles per square (about 25 sq ft each) and thick designer or premium shingles can be 5 (about 20 sq ft each). Always check the wrapper for your exact product.
How do I calculate shingles for a roof?
Find the sloped roof area in square feet, divide by 100 to get roofing squares, multiply by the bundles per square (usually 3), then add 10 to 15% for waste and round up to whole bundles. If you only have the flat footprint, multiply it by the slope factor for your pitch first to get the sloped area.
How many bundles of shingles do I need for 1000 square feet?
A 1000 sq ft sloped roof is 10 squares, so 30 bundles at 3 per square - about 33 bundles once you add 10% waste. For an architectural shingle packed 4 to the square it would be 40 bundles, around 44 with waste.
Should I buy by the bundle or the square?
You buy bundles, but order in whole squares of coverage and round bundles up. Keep two or three spare bundles back for repairs and for the offcuts around hips, valleys and penetrations - a roof outlives the product line, so matching shingles years later is hard.