How Many Square Feet Is An Average Roof
4/5100 square feet
Likewise, people ask, how big is the roof on a 2000 sq ft house?
Average Cost to Replace a Roof per House Size
House by Square Foot  

2,635  $9,000 – $13,000 
One may also ask, how do you estimate roofing? To estimate roofing materials, start by finding the total square footage of the roof and divide the number by 100 to determine the number of “squares” in the roof. Since it takes 3 bundles of shingles to cover a square, plan to purchase 3 bundles for each square. Then, add 10% to the number to account for waste.
Then, is the square footage of a house the same as the roof?
Roofing Quote Footage is Not the Same as Home Square FootageThe roof square footage is what we need to calculate a budget quote to do the job. All these things could add much square footage to that 1,500 sq. ft. number.
How long does a 30 year roof really last?
The truth is, a 30–year shingle will not really last 30 years. The expected service life of a 30–year product, if properly cared for, is approximately 25 years. If it’s not cared for properly, that 30 year shingle will only last 12 to 15 years. That’s one of the big misconceptions in the roofing marketplace.
Builder Mike Guertin Explains 3 Ways To Calculate The Quantity Of Shingles You’ll Need For Your Next Roofing Job
One of the biggest challenges for experienced builder and novices alike is accurately estimating materials for a construction projectespecially for roofs, because they can be difficult to access for taking measurements.
But dont fretIn this excerpt from my book Roofing with Asphalt Shingles, I describe three reliable methods for determining the area of a roof, plus Ive included tips for estimating the number of extra shingles youll need for waste, overlaps, and starter shingles.
Note: be sure to take your time and doublecheck your numbers when calculating the quantity of shingles, underlayment, flashings, and other materials needed for yourroofing project. The more accurate your estimates, the less time youll waste waiting for material deliveries during the project.
Hip And Ridge Cap Roofing Shingles
A bundle of hip and ridge cap roofing shingles has between 20 and 24 shingles. GAF hip and ridge shingles have 30 pieces per bundle. Owens Corning hip and ridge shingles have 24 shingles per bundle.
Owens Corning hip and ridge shingles come as a 36×12 3tab shingle, with precut perforations that allow you to tear off each hip and ridge shingle. So one shingle is 3 hip and ridge shingles. They sell packs of 24 shingles, but each shingle contains 3 hip ridge shingles, so you get 72 in all. This will cover 33 linear feet of your hip or ridge.
GAF hip and ridge shingles are 12 x 12, and it takes 30 of them to make 20 linear feet. If you use them to make hip joints to your peaks, then the linear length may be less as youll use more shingles to bridge the peak to hip transition.
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How Do You Calculate Square Footage For A Roof
Related Articles
When a roof needs to be replaced, one of the first steps you may perform is figuring out the roof area. Both the roof area and pitch contribute to the cost of a roofing job. Calculate square footage for a roof by measuring and by performing some basic math equations. With the area measurement, you can learn the approximate cost of a new roof. Use this information if you are purchasing a home that needs a new roof or if your current home needs one.
Measure the ground dimensions of the house using a tape measure, and write down these dimensions. Multiply the length by the width to arrive at the ground area of the house. If the house has an irregular shape, measure each part separately, figure the separate areas and add them together.
Convert the area to roofing squares. Because each 100 square feet of roof is one roofing square, divide the total area from Step 1 by 100. The answer is the number of roofing squares for the roof.
Estimate the pitch of the roof. Roofs have one of three pitches: low, medium or high. A low pitch rises 3 inches every 12 inches of base horizontal length. A medium pitch rises 6 to 9 inches every 12 inches of base horizontal length. A high pitch roof rises more than 9 inches for every 12 inches of base horizontal length. Estimate the roof pitch by sight or calculate it with a level in the next step.
Things You Will Need
How Many Shingles Are In A Bundle
Roof shingles are packaged and sold in bundles. Both architectural or laminate shingles come in bundles, which are also a standard pack size in order to make buying roofing supplies a more foolproof process. A bundle includes enough shingles to cover a third of a square, therefore meaning you will need three bundles per roofing square.
The number of shingles in each bundle will vary depending on the size of an individual shingle. Smaller shingles may have up to 30 shingles in a bundle, while larger shingles may have as few as 15 shingles per bundle. As most bundles are supplied with 3 bundles per square, to find out how many bundles you need, you would just multiply the roofing square measurement by 3.
So if you need enough shingles to cover 20 squares, you would multiply 20 by 3, giving you a result of 60. This means you would need to order 60 bundles of shingles to have enough to complete your roof.
Watch out for some manufacturers which have 4 bundles per square, in which case you would need to multiply your square measurement by 4 to determine how many bundles you need. To be sure that you dont run out while working on your project, it is always worth ordering extra bundles for the sake of contingency.
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What Else Impacts The Cost Of Your New Roof
Now you know how to roughly calculate your roofs square footage. And dont forget to plug that number into our roof calculator to get a rough estimate for your roof replacement.
Remember, the number of squares your roof has is one of the biggest cost factors for your replacement. But to truly understand what goes into the size of your investment, you need to know the other important factors that impact the cost of your new roof.
Because a roof replacement is such a sizable investment, we want every homeowner to understand what exactly factors into the final cost. Thats why we wrote another article breaking down the 9 factors that impact the cost of your new roof.
Since 1990, the team at Bill Ragan Roofing has proudly helped homeowners in Nashville and surrounding areas with all of their roofing needs. Giving you a positive and educational experience during a stressful time is our main goal. Even if you decide were not the right fit, at least youll have the knowledge needed to make the right decisions.
Check out this article on 9 Factors That Impact the Cost of Your New Roof to learn how a roofing contractor comes up with the final number for your replacement estimate.
Square Feet To Roofing Squares
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How Many Roofing Shingles Do I Need
To estimate how much roofing material you need, such as bundles of architectural shingles or rolls of synthetic roofing underlayment, you need to know the total square footage of your roofs surface.
How to Calculate Total Square Footage of Your Roof
To find your roofs total square footage:
Example #1: Shed Roof with One Roof Plane
For example, this shed roof has one roof plane.
Multiply length times width :
A x B = 40 x 30 = 1200 sq. ft. for the total square footage of the roof.
Example #2: Gable Roof with Two Roof Planes
This gable roof has two planes.
So to derive the total square footage of the roof, you would:
For example:
 Plane 1 : 40 x 30 = 1200 sq. ft.
 Plane 2 : 40 x 30 = 1200 sq. ft.
 Plane 1 + Plane 2 = 2400 sq. ft. for the total square footage of the roof.
Calculating The Area Of A Complex Roof
Areas of complex roofs with multiple hips and valleys take the most time to calculate. Start by making a rough sketch of the roof. To simplify the calculation, break down the sketch into rectangles and right triangles , then take as many measurements of the roof as you can to match the sides of the rectangles and triangles on the sketch.
Use visual cues from the existing roof shingles or roof sheathing to determine square lines off eaves edges or ridges. These cues will help you measure the lengths of the sides of the rectangles and triangles. For instance, the cutout slots on shingled roofs run perpendicular to the eaves, and nail rows in sheathing are pretty close to square also. It is difficult sometimes to get accurate measurements. Dont get too concerned though just round lengths to the nearest 6 in.
With the sketch filled in with measurements, you can determine the size of the roof area. The area of a rectangle is length multiplied by width, whereas the area of a right triangle is the length of the two sides that meet at the 90degree corner multiplied together and divided by two .
Tally the square footages of all the rectangles and triangles, which will give you the total square footage for the roof. The example here shows the calculation for a roof with two hips.
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How Many Square Feet Are In A Square Of 3 Tab Shingles
Each plywood sheet is 4 x 8 feet or 32 square feet, which coincidentally is almost exactly equivalent to the coverage of one bundle of traditional threetab shingles. If it’s a reroof project and you have access to the original paperwork from the last shingle installation, that may be useful in showing the roof area. via
Keep The Slope And Complexity Of Your Roof In Mind
You have to keep in mind the makeup of your roof when doing the calculation for the square footage. The steepness and complexity will change the number you multiply the footprint of your home by.
For example:
For an easy upandover, walkable gable roof, youll multiply the footprint of the roof by 1.3 to get the square footage of your roof.
For a hip roof with a low slope, you’ll multiply the footprint of the roof by 1.4 to get the square footage of your roof.
For a steep and complex roof, you’ll multiply the footprint of the roof by 1.6 to get the square footage of your roof.
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How Many Architecture Shingles Come In A Bundle
Once you found out how many bundles of shingles in a square, you may wonder, is it the same as all kinds of shingles? Lets take an example from architectural shingles.
Read also: Are Architectural Shingles Worth Extra Cost.
Well, you may find many different answers regarding this topic. Some manufacturers sell 4 bundles for a square while the other sell three bundles only. The number of shingles per bundle is also different some come with 22, the other comes with 26.
For architectural shingles, since manufacturers sell different numbers per bundle, it is always important to count your roofs width beforehand. Also, it is important to know how many bundles of shingles in a square. That way, you can avoid running out of shingles.
Sellers Roofing Company Minneapolis & Saint Paul
Sellers Roofing Company Minneapolis & Saint Paul provides residential & commercial roofing services to clients in the Brooklyn Park and Brooklyn center, Minnesota area. Specializing in full roof replacement, tearoffs, repairs, and storm damage assessment, we strive to offer the best overall customer experience in the residential roofing industry. We believe that every homeowner deserves honesty.
Contact Us
 AddressBrooklyn Park and Brooklyn center area MN 55443
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Factors That Determine The Cost Of A Roofing Square
Roof pricing is determined by a variety of factors, including but not limited to:
 Your homes geographic location
 Your roofs size
 Roofing material
 Material quality
 Current market for roofing materials
 Length of warranty after the replacement
 The contractors experience level and certifications
 How quickly you need the roof replaced
Calculate The Square Footage Of Your Roof
After considering the slope and complexity of your roof, youre ready to learn how to calculate the square footage of your roof.
To get a rough estimate for your roofs square footage, youll use this equation:
For example, if you have an easy up and over, walkable gable roof and a house that measures 56 feet lengthwise and 28 feet widthwise, your calculation will look like this:
56′ x 28′ = 1,568
1,568 x 1.3 = 2,038
Using this equation wont be 100% accurate, but knowing your roofs square footage is a great jumpingoff point to learn how much youll have to invest in your replacement. After getting your roofs rough square footage, put that number in our free Roofing Calculator to get an idea on the cost of your new roof.
Read Also: How Much Would A New Roof Cost
Hip And Ridge Cap Shingles
Hips and ridges are covered with cap shingles, which are 1ft. shingle squares that wrap over the hip or ridge. Like regular shingles, they overlap for a 5in. exposure.On roofs shingled with threetab or nocutout shingles, you simply cut standard shingles into caps. You can cap about 35 lin. ft. of ridge or hips with each bundle of threetab shingles that come three bundles to the square. You can also salvage waste shingle pieces and portions of damaged shingles for use as caps.
For roofs shingled with laminated shingles, multicutout shingles, and other patterned shingles, youll have to order hipandridge shingles that are manufactured as companions to the specific shingle product you are using. Theyre sold by the bundle and usually cap 35 lin. ft., but check with your supplier because some products vary. Just measure the length of the ridges and hips and divide by 35 to determine how many bundles of regular or hipandridge shingles youll need.
How To Estimate The Size Of A Roof
If youre replacing a roof, the first consideration needs to be the roofs size so you can accurately estimate project materials.
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.
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How Big Is A Square In Roofing Measuring For Shingles
Planning to find out how much a new roof would cost you and you need to measure your roofs area or find out how big is a square of shingles? Well then, you have come to the right place.
Installing a new roof on your own is never a good idea. Yes, replacing a few shingles here and there on your existing roof is quite easy but since this is such a huge investment, it is better to call a professional roofer.
If you are a DIYer though and want to start such a project, then read on as we provide some very useful tips.
In order for your roofing project to be successful, you need to invest in both your money and time. It is completely understandable that you would want to find out how much a roof costs.
We would like to warn you beforehand that roofing estimations can be quite difficult to decipher, which is why we are going to be straightforward.
how to measure for roofing shingles
What Is A Roofing Square
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 2400 square feet by 100 .
This means you would need 24 squares of shingles to cover that roof. Be sure to add 10%15% to all your material totals for trim allowance .
Pro Tip: Want to skip doing some math?Order a FREE RoofScopeX aerial roof reportto see the size of your roof in squares, as well as the slope of your roof. Keep the report on hand for future conversations with roofers or when reviewing estimates for your next roof replacement or repair.
Ready to get an estimate?
Search our list of independent roofing contractors in the Owens Corning Roofing Contractor Network to find the roofing professional thats right for you.
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