Tips for Calculating Roof Area so You’ll understand How numerous Bundles per Square You’ll need For Roof Area Coverage

So you require a brand-new roof, even if it is it’s to adorn your newly built home or to change your currently roof. Like many North Americans, did you do it wisely made decision to go through asphalt shingles due, in big part, to their vast selection of styles and also color blends. Like most of her neighbors, you plan to have actually the shingles mounted by a experienced roof contractor who will handle all the product calculations; however, the information listed below will help you understand how to estimate the amount of shingles and accessory materials you require for her roof.

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Calculating how plenty of shingles you need for her roof is very similar to calculating how much carpet you require for her floors or just how much background you need for her walls; simply recognize the area the the roof and also divide by the area spanned by every package of shingles.

Sounds simple, right? The just hard part is getting the yes, really measurements, and there room various methods to perform this. Many likely, the roofer will physically gain on the roof and, making use of a good old-fashioned ice cream measure, measure up the locations of every the miscellaneous roof sections and total castle together. Of course, if the house is a new construction, these values will be readily accessible from the architectural drawings.

Another ascendancy of ignorance that can offer you a ballpark estimate of the roof area on newly built roofs is to look in ~ the number of sheets the plywood used for the roof deck. Each plywood paper is 4 x 8 feet or 32 square feet, i beg your pardon coincidentally is virtually exactly identical to the coverage the one bundle of classic three-tab shingles. If the a re-roof project and you have accessibility to the initial paperwork native the critical shingle installation, that might be valuable in reflecting the roof area.

Some roofs are easy shapes, choose a long gable roof top top a bungalow through one large rectangle in ~ the prior of the house and also a an in similar way sized one in ~ the back of the house. A simple measurement of the size times the width and also you’re done. However then, there are complicated roofs v a mix of shapes and planes and surfaces — rectangles, triangles and also maybe a trapezoid “for great measure.” everything the form or intricacy of your roof, the goal is the same: measure up the area of all the surfaces and add them with each other to gain the complete area.

Another option is to measure your home’s height floor’s square footage or, an ext correctly, the attic floor area. If you use this method, you’ll require to variable in the slope of the roof. For example, a really steep roof ~ above a 1,000 square foot attic will need an ext shingles 보다 a reduced sloped roof on the very same sized attic.

Your roofer will know that steeper roofs use more shingles than lower sloped roofs, because that the same home size, and there are established slope multiplier determinants to do this calculation an easy (see Table below). Using this worth and allowing for the extr roof area overhangs at the soffit, girlfriend can obtain a decent approximation that the roof area there is no going on the roof.

Roof Slope


To usage the table, merely multiply the projected horizontal area by the conversion factor for the ideal roof slope. The result is the actual area that the roof.

With recent advancements in technology, a newer roof measure option requires satellite and/or drone images, which, as soon as properly calibrated, can yield an accurate roof area measurement. One such business is obtainable through EagleView Technologies. Roofers deserve to use these tools to conserve time preparing roof area estimates and also can even export the details in the type of a job quote to homeowners.

Roof locations are generally referred come in the roofing market using a term referred to as a “square,” i beg your pardon is merely 100 square feet that roof area. If this area can also be measure in metric units (square meters), imperial square foot units are most frequently used and are specifically referenced in this blog.

Asphalt shingles are commonly packaged with this in mind, however if a parcel of shingles covered an entire 100 square foot square, it would certainly be too hefty to handle. So, most popular shingles are offered such that 3 bundles are required to covering one square that roof area. Yet be mindful — no all shingle brands space packaged three bundles to a square! check out the brand carefully, as some brands need a bit an ext than 3 bundles to cover a square. Specialty shingles, such as Armourshake, space heavier and therefore packaged to cover 20 square feet every bundle, or five bundles every square.



You can’t simply go by the variety of shingles in a bundle since shingle size and also coverage differ from one brand to the next. Because that example, if Brand A has 20 shingles in a package, but Brand B has 26, it could be that the Brand A bundle covers much more area. The vital dimension you must look in ~ is the area spanned per bundle. Through law, this information must be presented on the shingle wrapper so consumers know just how much product lock getting. 

The handy Chart listed below Shows girlfriend the average Coverage Area per Bundle in Square Feet for all Shingle Brands.


Now that you know how countless bundles of shingles will be required, realize that there are various other roofing product needs to consider. If the measurement for the shingles will certainly be in area (square feet), many roofing accessory commodities will it is in measured in length (linear feet). Her roofing contractor will certainly therefore additionally need come take note of pick other roof dimensions, such as the total eave length, complete length of all valleys and also length of all ridges and also hips in bespeak to appropriately calculate the accessory roofing materials for the entirety job.


Eaves Protection


Starter Strips

The total eave length deserve to be added to the full length of all rake edge to obtain the full linear feet necessary for drip edging. This same measurement is supplied to calculation the quantity of starter piece shingles you’ll need. leading Edge PlusTM shingles space the ideal starter strip, and also a bundle consist of 123 direct feet.




Depending ~ above the roof geometry, valleys might be current on the roof, and, if so, the complete linear feet that the valleys will have to be measured therefore that sufficient valley flashing can be delivered. Because’s eave protector membranes are recommended for valley applications, the valley membrane requirements deserve to simply be included to the eave membrane requirements.

Ridge Lines and also Hips

While just some roof design will have valleys, all sloped roofs will have at least a ridge line, and also many will have actually hips. These need to be finished with capping shingles, which deserve to be cut from the ar shingles in part cases, however are much more likely to it is in capped with shingles specifically created this purpose.

Hip and also Ridge Shingles supplies the complying with lineup that hip and ridge shingles. Their associated coverage in linear feet is shown.

* every values presented are approximate

How numerous Shingle bundles Fit ~ above a Pallet?

Those roofers who keep shingles for future jobs may discover it useful to recognize how numerous shingle majority fit on a pallet. The answer varies depending upon the particular product. Here’s a handy chart that mirrors you how plenty of bundles of every product will fit top top a traditional pallet.


What about Shingle Waste?

There’s one critical shingle calculation the is best left to an competent roofing estimator, i.e., just how much shingle rubbish is most likely to it is in generated. While there room some market rules of ignorance (e.g., smaller roofs tend to have actually a higher waste element than larger roofs), that is an overwhelming to accurately predict the portion of shingle waste.

However, you have the right to count on around 10 – 15 percent together a basic range. As soon as the roof is done, it might be the the variety of bundles ordered to be perfectly calculated, and also there isn’t a single shingle left over. But, usually, there will be a bundle or fifty percent a bundle remaining. If so, that a great idea to store this bundle in a dry, safeguarded place in situation it is required for future roof repair work.’s “Blueprint for Roofing” video clip will present you how the pros perform it.

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