How Much Does a Bundle of Shingles Cover?

The short answer

Most common asphalt shingles are packed so that 3 bundles cover one roofing square, which is 100 square feet of roof. That makes each bundle cover about 33.3 square feet. Some heavier or designer shingles are packed at 4 or even 5 bundles per square, which brings coverage down to 25 or 20 square feet per bundle. The number that counts is the one printed on the wrapper of the shingle you buy.

Why coverage is not the size of the shingles

Shingles overlap. Each course covers the top part of the course below it, so only the exposed part of each shingle counts toward coverage. Two shingles of the same size can have different coverage if one has a larger exposure. That is why manufacturers state coverage per bundle rather than leaving you to add up shingle dimensions.

Bundles per square at a glance

From roof area to bundles

1. Work out the roof surface: footprint with overhang × pitch multiplier.
2. Add a waste allowance for your roof shape.
3. Divide by 100 to get squares.
4. Multiply by bundles per square and round up.

A 40 by 30 foot house with a 1 foot overhang and a 6/12 roof has 1,502.64 ft² of roof. With 10 percent waste it needs 16.53 squares. At 3 bundles per square that is 49.6, so 50 bundles. At 4 bundles per square it would be 67 bundles. The roofing calculator does these steps for you.

Ridge cap and starter bundles

Ridge cap and starter strip are counted by linear feet, not by squares:

• Ridge cap bundles state how many linear feet of ridge or hip they cover. Measure every ridge and hip, add them and divide by that coverage.
• Starter strip bundles state linear feet as well. Measure the eaves, and the rakes if your product requires starter there too.

Some roofers cut ridge cap or starter from regular three-tab shingles. If you plan to do that, add those shingles to your bundle count instead of buying separate products.

How much does a bundle weigh?

Bundle weight varies widely by product. Heavier architectural shingles weigh noticeably more per bundle than basic three-tab shingles. Check the weight on the wrapper before you plan to carry bundles up a ladder, and make sure the roof deck and any delivery to the roof can handle the load. Many suppliers can deliver bundles directly onto the roof with a conveyor or boom.

How much extra to buy

Keep one or two spare bundles from the same lot for future repairs. Colors vary slightly between production runs, and a perfect match is hard to find later.

Bundles for common roof sizes

This table starts from the footprint including overhang, applies a 6/12 pitch (multiplier 1.1180), adds 10 percent waste and uses 3 bundles per square:

For a steeper or flatter roof, swap in the multiplier for your pitch. An 8/12 roof on a 1,500 ft² footprint is 1,803 ft² of surface, about 126 square feet more than at 6/12.

Three-tab and architectural shingles

Three-tab shingles are flat, single-layer shingles with cutouts that make them look like three separate tabs. Architectural or dimensional shingles are laminated from two or more layers, which gives a thicker, textured look. Both are commonly packed at 3 bundles per square, but laminated shingles are heavier per bundle and some premium lines use more bundles per square. The calculation is the same for both; only the bundles per square and the weight change.

One practical difference: many roofers cut ridge cap and starter from three-tab shingles, while laminated shingles usually need dedicated ridge and starter products because their layers do not cut into neat pieces.

Small repairs and partial roofs

For a repair, measure the damaged area on the roof surface itself, since you are already on the slope and the pitch multiplier is not needed. A 10 by 10 foot patch is 100 ft², one square, or 3 bundles. Add at least one extra bundle because a repair needs more cutting to weave new shingles into old ones. If the roof is older, the new shingles may not match exactly; buying the same product line and color helps.

For one face of a roof, measure that face's footprint (its horizontal width and the run to the ridge) and apply the pitch. A face 40 feet long with a 15 foot run at 6/12 is 40 × 15 × 1.1180 = 670.8 ft², or 6.71 squares before waste.

Storing and handling bundles

• Store bundles flat on a pallet, off the ground and covered, so they do not bend or absorb moisture.
• Do not stack bundles too high; the bottom ones can deform and stick together in hot weather.
• On the roof, spread bundles across the framing near the ridge rather than piling them in one spot.
• In cold weather shingles become stiff and can crack when bent; follow the maker's guidance on installation temperatures.

Common mistakes

• Assuming every shingle is 3 bundles per square.
• Counting ridge cap and starter as part of the field shingle bundles.
• Using floor area instead of roof surface.
• Mixing bundles from different lots on one roof face.

Frequently asked questions

How many bundles of shingles for a 10 by 12 shed?

A 10 by 12 shed with a 6 inch overhang and a 4/12 roof has a footprint of 11 × 13 = 143 ft² and a roof surface of 150.7 ft². With 10 percent extra that is 165.8 ft², or 1.66 squares, which is 5 bundles at 3 per square.

Can I return unopened bundles?

Many suppliers accept unopened bundles, but policies vary. Ask before you order extra.

How many nails per bundle?

The nailing pattern is set by the shingle maker and often increases in high-wind areas. Check the wrapper for the number of nails per shingle and multiply by shingles per bundle.