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Roofing Square Calculator

If you’re replacing a roof, the first consideration needs to be the roof’s size so accurate material estimates can be made.

In the U.S., roofs are measured in square footage, and roofing contractors typically quote projects based on the size of the roof in squares. Consequently, gathering the size of the roof in squares and square footage is the first step.

Getting accurate roof measurements can be difficult but with our roofing calculator, you’ll be well prepared to take measurements of any roof. Whether you’re a contractor looking to train a new employee or a homeowner looking to do some renovations, you’ll find this guide helpful for any roofing project. If you need assistance in determining how much roofing you will need, Please feel free to call Sky Roof Measure at –  (315) 926-1777

What’s your roof slope?

slope roof

You will also need to know the slope of your deck. In order to determine this, measure the vertical rise of your deck in inches over a 12″ horizontal distance. If this rise is 4″, then your roof slope is 4 in 12.

Roof slopes are always expressed with the vertical rise mentioned first and the horizontal run (12″) mentioned second.

Roofing Calculator

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.

 

rooftop measurements

Roofing Square Cost

Roof surfaces are measured in “squares”. A roofing square is equal to 100 square feet of the roof. To determine the number of squares on the gable roof example in this post, divide its total of 20,000 square feet by 100 (20,000 ÷ 100 = 200). This means you would need 200 squares of shingles to cover that roof.

How to measure roof squares?

So you need a new roof, whether it’s to adorn your newly built home or to replace your existing roof. Like most North Americans, you’ve wisely decided to go with asphalt shingles due, in large part, to their vast range of styles and color blends. Like most of your neighbors, you plan to have the shingles installed by a professional roof contractor who will handle all the material calculations; however, the information below will help you understand how to estimate the amount of shingles and accessory materials you need for your roof.

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

Metal roofing is sold by the sheet/panel. To determine the number of sheet/panels you will need to cover your roof, you should divide the width of the roof by the sheet/panel coverage width.

Most other types of roofing are sold by the square foot. If you need assistance in determining how much roofing you will need, Please feel free to call Sky Roof Measure at –  (315) 926-1777

Calculating the Area of a Complex Roof

Areas of complex roofs with many hips and valleys take the most time to calculate. To get started, make a rough sketch of the roof. To simplify things, break down the sketch into rectangles and right triangles and then take as many measurements of the roof as you can to match the sides of the rectangles and triangles on the sketch.

Square lines off eaves edges or ridges can be determined by using visual cues from the existing roof. These will help you measure the lengths of the sides of the rectangles and triangles. For example, the cutout slots on shingled roofs run perpendicular to the eaves, and nail rows in sheathing are very close to square as well. While it can be challenging sometimes to get accurate measurements, don’t be too concerned and round lengths to the nearest 6 in.

When your sketch is filled in with measurements, determine the size of the roof area. The area of a rectangle is length multiplied by width, while the area of a right triangle is the length of the two sides that meet at the 90-degree corner multiplied together and divided by two.

That said, on average, most contractors will charge between $3.50 and $5.50 per square foot or $350 to $550 per square (100 sq. ft.) to install or replace an asphalt shingle roof on a typical house. Thus, at the mid point of the above price range, you can expect to pay about $4.50 per sq.

Satellite roof measurements

What Is A Roofing Square? Roofing Calculator

Roof surfaces are measured in “squares”. A roofing square is equal to 100 square feet of the roof. To determine the number of squares on the gable roof example in this post, divide its total of 12,000 square feet by 100 (12,000 ÷ 100 = 120). This means you would need 120 squares of shingles to cover that roof.

                          Call Us – (315) 926-1777

Squares are also used to identify the amount of underlayment your roof requires. So, using the same example and formula above, you’ll also need 120 squares of underlayment for a roof with a square footage of 12,000. Most—if not all—companies that offer residential roofing in Naperville, Illinois and in other cities in the U.S. offer underlayment in rolls of four (4) squares each. As such, if your roof requires 120 squares, you will need 30 rolls (120 ÷ 4 = 30) of underlayment from roofers.
 

Roofing Pitch for Square Roof Area

Finally, the more complex part, measuring your roof’s pitch.

  1. Estimate or calculate the pitch of your roof .
  2. Climb to the peak of your roof. Bring a two foot level. Hold your level outward, perfectly horizontal from your roof, so the bubble is in the middle of the indicator glass. Then, using a tape measure, determine how many inches are between the middle of your level and your roof. 
  3. Multiply the number of roofing squares by the following digits below.

Low Pitch: 1.07 x Roofing Squares
Medium Pitch: 1.185 x Roofing Squares
High Pitch: 1.36 x Roofing Squares

Please note that we recommend letting a professional roofer do the calculations for your own safety!

Calculating a roofing square of your roof is very important, if you’re communicating with someone from the industry.

If you ever need help with roofing square or anything related to the roofing, you can simply approach the Sky Roof Measure, a company that has been serving local residents with 5 star roofing measurement services and an excellent track record.