Roof Length:


Roof Width:


Roof Pitch:

Roof Type:


Roof area: sq.ft

Numbes of squares:

bundles of 3-tab shingles

Approximate price $

An important part of any roofing repair or replacement project is being able to accurately calculate the quantity of roofing materials required to finish the job. For example, you will need to figure out the exact number of shingles required to cover the entire roof area.

Once you know this number, you can estimate the final price of the materials. Thus, a key element in your project will be the roofing material calculator, and more specifically, the roof shingle calculator.

Before getting started, you should know a little about how shingles are talked about by professionals in the industry and how they are purchased at a home improvement store. One important point is that it is possible to purchase shingles both by the bundle and by the roofing square.

A square of shingles is the number of shingles needed to cover 100 sq feet of roof area. However, shingles are packaged in a way that they are light enough for the average person to carry around. As a rule of thumb, there are 3 bundles to a square, assuming that you are using three-tab strip shingles. There are also 29 standard-sized shingles (measuring 12 inches by 36 inches) in each one of these.

With that as background, you are now ready to estimate how many shingles you will purchase for your roof project. This roof shingle calculator requires four basic inputs:

  • Roof length (measured in feet)
  • Roof width (measured in feet)
  • Roof pitch
  • Roof type (either gable or hip)

Using these four inputs, you will get several basic outputs:

  • Roof area (measured in sq ft)
  • Number of squares
  • Number of bundles
  • Approximate price (in dollars)

The estimate of a final price will depend, to a large degree, on the overall size of your home (i.e. sq footage). This makes sense, right? The bigger your roof area, the more shingles will be used to cover the footage of this area completely.

In addition, you will need to take into account the materials being used. If you are using standard asphalt shingles, your price will be lower than if you are using more expensive slate, metal or tile shingles. For most residential homes, asphalt shingles are the standard, but there are plenty of reasons to avoid using asphalt shingles as your material, such as if you are concerned about the waterproof coverage of your home.

Keep in mind that the roof shingle calculator assumes zero waste. This is rarely the case, however, since not all homes have dimensions that can be perfectly fit with 12-inch x 36-inch shingles. Moreover, during the process of the repair, some shingles and tiles might slide off. As a result, most experts recommend ordering 1 extra bundle of shingles.

The roof shingle calculator is a free estimator that serves a useful purpose during any roof repair or replacement project. Once you enter the basic roof dimensions and enter the type of roof, you will get a very accurate result telling you exactly the amount of shingles that are required to cover your new roof.

Here’s another useful way to calculate how many roof shingles you can use: