Tips because that Calculating Roof Area therefore You’ll recognize How plenty of Bundles per Square You’ll require For Roof Area Coverage

So you need a brand-new roof, whether it’s to adorn your newly developed home or to change your existing roof. Like many North Americans, you’ve wisely chose to go v asphalt shingles due, in large part, to their vast variety of styles and also color blends. Like most of her neighbors, you plan to have the shingles set up by a experienced roof contractor who will handle all the product calculations; however, the information listed below will assist you understand how to estimate the quantity of shingles and also accessory products you need for her roof.

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Calculating how many shingles you require for your roof is very similar to calculating how much carpet you need for her floors or how much wallpaper you require for her walls; simply identify the area the the roof and divide by the area covered by each package that shingles.

Sounds simple, right? The just hard part is gaining the yes, really measurements, and also there room various ways to do this. Many likely, the roofer will certainly physically obtain on the roof and, using a an excellent old-fashioned ice cream measure, measure up the areas of all the miscellaneous roof sections and total lock together. The course, if the house is a brand-new construction, these values will it is in readily obtainable from the architectural drawings.

Another rule of thumb that can offer you a ballpark estimate of the roof area on newly developed roofs is come look in ~ the variety of sheets that plywood supplied for the roof deck. Each plywood sheet is 4 x 8 feet or 32 square feet, which coincidentally is nearly exactly indistinguishable to the coverage of one bundle of traditional three-tab shingles. If that a re-roof project and also you have access to the original paperwork from the last shingle installation, that may be valuable in reflecting the roof area.

Some roofs are basic shapes, favor a long gable roof on a bungalow with one big rectangle in ~ the former of the house and a an in similar way sized one in ~ the back of the house. A basic measurement of the length times the width and you’re done. Yet then, over there are facility roofs with a mix of shapes and also planes and surfaces — rectangles, triangles and maybe a trapezoid “for an excellent measure.” everything the form or complexity of your roof, the score is the same: measure up the area of every the surfaces and include them together to get the total area.

Another alternative is come measure her home’s optimal floor’s square clip or, an ext correctly, the attic floor area. If you use this method, you’ll need to element in the steep of the roof. For example, a very steep roof ~ above a 1,000 square foot attic will certainly need an ext shingles than a reduced sloped roof ~ above the same sized attic.

Your roofer will understand that steeper roofs use more shingles than lower sloped roofs, because that the same residence size, and also there are created slope multiplier determinants to do this calculation basic (see Table below). Making use of this worth and enabling for the additional roof area overhangs at the soffit, girlfriend can obtain a decent approximation of the roof area without going on the roof.

Roof Slope


To use the table, just multiply the projected horizontal area through the conversion variable for the ideal roof slope. The an outcome is the really area that the roof.

With recent developments in technology, a more recent roof measure option involves satellite and/or drone images, which, once properly calibrated, have the right to yield specific roof area measurement. One such company is available through EagleView Technologies. Roofers can use these devices to conserve time prepare roof area estimates and can even export the details in the kind of a job quote come homeowners.

Roof locations are usually referred to in the roofing market using a term called a “square,” i m sorry is simply 100 square feet the roof area. If this area can additionally be measure in metric devices (square meters), royal square foot units are most generally used and also are solely referenced in this blog.

Asphalt shingles are generally packaged v this in mind, but if a parcel of shingles covered whole 100 square foot square, it would be too heavy to handle. So, most famous shingles are marketed such that 3 bundles are essential to covering one square of roof area. However be mindful — not all shingle brands space packaged three bundles come a square! read the brand carefully, as part brands require a bit an ext than three bundles to cover a square. Specialty shingles, such as Armourshake, are heavier and also therefore packaged come cover 20 square feet per bundle, or five bundles per square.



You can’t merely go by the variety of shingles in a bundle due to the fact that shingle size and coverage differ from one brand come the next. For example, if Brand A has actually 20 shingles in a package, yet Brand B has 26, it might be that the Brand A bundle covers more area. The crucial dimension you need to look at is the area extended per bundle. By law, this info must be displayed on the shingle wrapper so consumer know just how much product they’re getting. 

The handy Chart below Shows girlfriend the mean Coverage Area every Bundle in Square Feet for all Shingle Brands.


Now that you know how plenty of bundles that shingles will be required, realize that there are various other roofing material needs come consider. If the measurement because that the shingles will be in area (square feet), many roofing accessory products will it is in measured in size (linear feet). Her roofing contractor will certainly therefore also need to take note of select other roof dimensions, such as the total eave length, complete length of every valleys and length of every ridges and hips in order to effectively calculate the accessory roofing materials for the entirety job.


Eaves Protection


Starter Strips

The total eave length can be included to the full length of every rake edges to gain the complete linear feet required for drip edging. This same measurement is offered to calculation the amount of starter strip shingles you’ll need. top Edge PlusTM shingles space the appropriate starter strip, and a bundle consists 123 direct feet.




Depending ~ above the roof geometry, valleys might be existing on the roof, and, if so, the complete linear feet that the valleys will should be measured so that enough valley flashing deserve to be delivered. Due to the fact that’s eave protector membranes are recommended for sink applications, the sink membrane requirements have the right to simply be included to the eave membrane requirements.

Ridge Lines and also Hips

While only some roof design will have actually valleys, all sloped roofs will have at the very least a ridge line, and many will have actually hips. These must be finished v capping shingles, which can be cut from the ar shingles in part cases, but are an ext likely to it is in capped through shingles specifically created this purpose.

Hip and Ridge Shingles supplies the adhering to lineup that hip and also ridge shingles. Their connected coverage in linear feet is shown.

* all values displayed are approximate

How numerous Shingle majority Fit ~ above a Pallet?

Those roofers who keep shingles for future work may find it advantageous to understand how plenty of shingle bundles fit on a pallet. The price varies depending on the particular product. This is a handy chart that shows you how countless bundles of every product will certainly fit ~ above a standard pallet.


What about Shingle Waste?

There’s one critical shingle calculation the is ideal left to an competent roofing estimator, i.e., how much shingle garbage is most likely to be generated. While there space some sector rules of ignorance (e.g., smaller roofs have tendency to have a higher waste element than bigger roofs), the is difficult to accurately guess the percentage of shingle waste.

However, you deserve to count on around 10 – 15 percent as a basic range. When the roof is done, it may 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, it’s a great idea to keep this bundle in a dry, defended place in instance it is necessary for future roof repair work.’s “Blueprint because that Roofing” video clip will present you how the pros execute it.

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