Shingle bundles for 1,100 sq ft of roof
These counts are for 1,100 sq ft of actual roof surface, measured on the slope. Most architectural and 3-tab shingles come three bundles to a square (100 sq ft); some heavier premium shingles take four. Suppliers sell whole bundles, so each count is rounded up.
| Waste allowance | Squares to order | Bundles (3 a square) | Bundles (4 a square) |
|---|---|---|---|
| None (exact) | 11.0 | 33 | 44 |
| 10% (simple gable) | 12.1 | 37 | 49 |
| 15% (hip, valleys) | 12.7 | 38 | 51 |
| 20% (complex roof) | 13.2 | 40 | 53 |
You will also need about 2 rolls of synthetic underlayment (1,000 sq ft rolls with 10% for laps), plus starter strip along the eaves and rakes and ridge cap along the ridges and hips.
If 1,100 sq ft is the house footprint
Many people know the floor area of the house, not the roof. A roof covers the footprint plus the overhang, and the slope makes it larger again. For a 44 × 25 ft house (1,100 sq ft) with a 1 ft overhang, the roof covers 1,242 sq ft in plan, and the table shows how the pitch adds to that. Bundles include 10% waste, at three a square.
| Roof pitch | Roof area (sq ft) | Squares | Bundles |
|---|---|---|---|
| 4/12 | 1,309 | 13.1 | 44 |
| 6/12 | 1,389 | 13.9 | 46 |
| 8/12 | 1,493 | 14.9 | 50 |
| 10/12 | 1,617 | 16.2 | 54 |
| 12/12 | 1,756 | 17.6 | 58 |
The roofing calculator on this page opens on 1,100 sq ft of roof surface. To work from a house instead, switch "What do you know?" to the house footprint and enter its size, overhang and pitch, or read how to calculate roofing squares step by step.
Weight, nails and edge metal
Architectural shingles weigh about 60 to 80 lb a bundle, so 37 bundles are roughly 2,590 lb (1.3 tons) to lift onto the roof, which is the hard part of the job. Spread bundles across the roof's rafters, never stacked in one spot.
At about 320 nails a square (four per shingle), an 11.0 square roof uses around 3,520 nails, which is a 25 lb box or a couple of coils for a nail gun. Drip edge runs along the eaves and up the rakes: measure those edges and divide by 10 for the number of 10 ft pieces.
A 1,100 sq ft roof: choosing the waste allowance
1,100 sq ft of roof is 11.0 squares, so 33 bundles with nothing spare. With 10% waste the order is 37 bundles, with 15% it is 38, and with 20% it is 40. From 10% to 20% is only 3 more bundles at this size, so the choice costs little either way.
Pick the allowance from the shape of the roof and not from habit. Two plain rectangles meeting at a ridge need the least. Every hip and valley means shingles cut on a diagonal, and part of each cut piece is thrown away, so a roof with several of them belongs at 15%, and one with dormers and many small planes at 20%.
How high the ridge sits
Pitch decides the height of the roof as well as its area. The 44 × 25 ft example house is 25 ft wide, so each side of a gable roof runs 12.5 ft in plan from the wall to the ridge. At a 6/12 pitch the roof rises 6 in for each foot, which puts the ridge 6.25 ft above the top of the walls.
At 4/12 the same ridge would be 4.17 ft up, and at 12/12 it would be 12.5 ft. The height matters for the ladder you need, for where a roof-top delivery can reach, and for whether the roof can be walked on at all. A steep roof needs staging and fall protection, and it takes longer for the same number of bundles.
Want to change anything else? The calculator above is the full Roofing Calculator: edit any number and the results update instantly.
Tools & materials for this project
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Frequently asked questions
How many bundles of shingles do I need for 1,100 square feet?
1,100 square feet of roof is 11 squares. At three bundles a square that is 33 bundles exactly, so buy 37 bundles with 10% for waste on a simple gable roof, or 38 with 15% for a hip roof or one with valleys.
How many squares is 1,100 square feet of roof?
11 squares, because one roofing square is 100 square feet. With 10% waste you order 12.1 squares, which suppliers round to whole bundles: 37.
What if 1,100 sq ft is the size of my house, not the roof?
Then the roof is bigger, because it slopes and overhangs the walls. A 44 × 25 ft house (1,100 sq ft) with a 1 ft overhang and a 6/12 pitch has about 1,389 sq ft of roof, which is 13.9 squares and 46 bundles with 10% waste.
Related sizes and guides
Estimates only. Results assume standard materials and simple shapes. Supplier products vary, and the final call on quantity, structure and safety is yours. Check your local code and your supplier's guidance before ordering.