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How To Figure How Many Shingles For A Roof

Instructions For The Shingle Calculator

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Enter the approximate value for how many square feet the house has in the first number box.

Select how steep the roof is. A 4/12 pitch is relatively easy to walk, an 8/12 is very difficult to walk, and a 12/12 is impossible to walk.

Select the complexity of the roof. One roof line is simple, two to four roof lines is average, and anything over four roof lines is complex.

Choose whether or not your roof is new or will have multiple layers to remove.

Finally, choose what type of new roofing will be used.

This calculator is only an estimation. It is not as accurate as measuring each roof plane and adding the square feet together. It does take into account for an average number of offsets and an overhang. It also takes into account for the starters, the edges, and the ride caps. The squares returned include everything.

The formula for solving for the area of a roof involves climbing onto the roof. Measure each roof plane. For shapes such as trapezoids, triangles, and trapeziums, find the average length by finding the center of the width. Remember to add two feet for valleys. Add the square footage of all of the roof planes together. Divide this by one hundred for the number of squares. There are three bundles of shingles for each square.

To determine how many will be needed for starters and edges, measure the entire perimeter of the roof and divide it by three. Since there are twenty six shingles in a bundle of twenty year shingles , divide the result by twenty six.

How Many Bundles Of Shingles Do I Need For A 10×12 Shed

To calculate the amount of shingle bundles needed for a 10×12 shed, you first have to calculate the square footage of the roof.

Lets say this shed has a gable roof running parallel to the long end of the shed. The shed also has a roof overhang of 1 all around. Therefore the length of one side of the roof is 14.

The pitch of this roof is 4:12. A rough estimate of the width of one side of the roof is just a bit over 5 say 53, which is 5.25 feet. Add a foot of overhang and you get 6.25. Multiply this by 14

Multiply the two and you get 87.5 square feet. Multiply that number times two and you get 175 square feet your total roof area.

Now you need to find out how many bundles of shingles is required for 175 square feet of roofing. Divide 175 by 100 to find out how many squares of roofing you have. This equals 1.75. We know that each square of roofing requires 3 bundles of shingles, so 3 bundles of shingles times 1.75 roofing squares equals 5.25 bundles of shingles.

You still have .25 of roof leftover. It would be prudent to purchase one extra bundle of shingles to ensure you cover your entire area and to replace any damaged shingles in the future.

Thus, it takes 6 bundles of shingles to properly cover the roof of a 10×12 shed with a gabled roof and a 1 overhang around all sides.

How Many Shingles Do I Need For 1000 Square Feet

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. Moreover, how many bundles of shingles do I need for 1000 square feet?

Three bundles to a square is most common, which applies to most three-tab strip shingles and some lightweight laminated shingles. Heavier three-tabbed shingles and laminated shingles require four, or sometimes five, bundles to cover a square.

how long does it take to roof a 1000 square foot house? ‘ However, in general, you can expect a typical roof replacement on a 1,000-2,000 sq. ft. home to take anywhere from 1-3 days.

Herein, how many shingles do I need calculator?

To determine the number of squares on the gable roof above, divide its total of 24,000 square feet by 100 . This means you would need 240 squares of shingles to cover that roof. The most common type of shingle, called a three-tab or strip shingle, is generally packaged three bundles per square.

How much does it cost to reroof a 1000 square foot house?

Average Cost to Replace a Roof per House Size

House by Square Foot

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What Is A Bundle Of Shingles

A bundle of shingles is one package of shingles. Shingle manufacturers will package their bundles so that several usually 3 or 4 will add up to 100 square feet. A bundle of shingles will contain anywhere from 15 to 29 shingles, depending on the type and size.

It is important to note that there is not a uniform number of shingles per bundle. The number of shingles in a bundle will vary tremendously depending on if you have typical 3-tab versus laminated or other specialty shingles.

A bundle can only be so big. They are designed so that the average person can pick them up and move them, so you will never have one bundle drastically larger or heavier than a bundle for a different type of roof shingle.

Initially, a bundle of shingles was supposed to cover one piece of roof sheathing 32 square feet. And three bundles would add up to 100 square feet. The advent of laminated shingles, which are much thicker than standard 3-tab, have created bundles with a total area that is less than the original 32 square feet.

How To Figure Shingles For A Roof


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.

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How Many Rolls Of Felt Will You Need

Roofing felt is sold by the roll. The average roll of 15-pound roofing felt covers about 400 ft2, or 4 squares, while the average roll of 30-pound roofing felt covers about 200 ft2, or 2 squares.

Rolls of felt are 36 wide x 144 long for 15# and 72 long for 30#. Consider other underlayment options as needed, such as rubber or tar products.

How Shingle Quantities Are Measured

Roof shingles are sold by both the bundle and by the square. A square of shingles is the quantity needed to cover 100 sq. ft. of roof. Shingles are packaged in paper- or plastic-wrapped bundles designed to be light enough for a person to carry, so heavier shingles require more bundles per square. Three bundles to a square is most common, which applies to most three-tab strip shingles and some lightweight laminated shingles. Heavier three-tabbed shingles and laminated shingles require four, or sometimes five, bundles to cover a square. When shingles come three bundles to the square, there are 29 standard-sized shingles in each bundle.

Figuring out the roof area is the first step to determine how many bundles youll need to order. There are two ways to size up a new or freshly stripped roof: the measurement method and the sheet-count method. Theres a third method for calculating bundles when youll be laying new shingles over old or if the old roof is still in place.

Once you have a bundle or square count for the main roof area, youll add additional shingles to account for waste, starter shingles, and extra shingles for hip and ridge caps.

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How Many Shingles In A Square

For regular 3-tab, non-laminated shingles, youll have around 78 shingles per square. Some older styles of 3-tab shingles will have up to 87 shingles per square. Architectural shingles will have anywhere from 57 to 66 shingles per square.

The number of shingles in an architectural or laminated shingle bundle vary since there are many, many different varieties of these types of shingles available for purchase. Sizes are different and therefore the number of shingles in a square differs from square to square for that type of shingle.

How Do You Calculate How Many Shingles To Buy

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Measure the actual surface area of your roof rather than basing your calculations on the homes square footage. Roof pitch and elements such as gables and dormers will affect the amount as well. Use a simple roofing calculator to get a rough idea of square footage. For a more accurate picture, use a roofing calculator that can take all of these peripheral factors into account or consult with a roofing contractor.

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How Many Bundles Of Shingles Per Square

A package of roofing shingles is called a bundle. Laminate or architectural shingles, one of the most common types of roofing shingles, are generally packaged in three bundles per square.

So in the 2400 square foot gable roof example, you would need 72 bundles of shingles .

Here are a couple more examples:

How To Measure Your Total Roof Area

Length x width = square footage

In order to determine the amount of shingles you need for your roof, youll need to know the square footage of your roofs surface. Measurements for the area of the roof will depend on what roof type you may have, whether its a gable roof with fewer planes or a hip roof with more.

To find the square footage of your roof, measure the roof length and roof width of each plane, including overhangs, and multiply them together. Then, add up the square footage of each plane. This will give you the total square footage.

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Finding The Size Of The Roof In Squares

Roofing contractors estimate projects and materials by the square, so it is crucial to find this measurement to estimate the amount of material needed accurately. A square simply refers to a 10 x 10 square of roofing. This is simply 100 square feet of roof.

To find the squares, divide the overall roof area by 100 and then round up. For instance, if the roof is 1550 square feet, then it is 16 squares.

Roof Replacement Vs Repair


Here are some telling signs that an asphalt shingles roof need to be replaced:

– Many shingles are noticeably buckling or curling- A significant number of shingles is missing – Many shingles are missing in the area of the roof valley – Numerous shingles have large visible cracks- There is visible shingle discoloration as well as dark streaks on many areas of the roof. Overall, it looks very old and ugly.


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Below, there is a simple triangle, and the math used to work out how to make a proper measurement. Once you work through the basic triangle, we will review a typical roof, and how to apply some simple math to calculate how much material you will need for a roof used in our hypothetical example.

1 roof square = 100 square feet The length times the height of a triangle is twice its area . So if you divide your answer of a product of length times height by two, you will get the area of a triangle. /2 = Area

New Shingle Roof

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In Figure above: l=30 feet h=12 feet /2 = 180 square feet

Now that the basic concept has been covered, lets take a look at a more complex roofing system. In this overhead view you see both a hip-end section, and gable ends. With a more complex roof such is this one, it is highly recommended that you make a basic sketch. By doing so, it will be easier to mark your measurements, and calculate the necessary materials for the project. For this example we will break this roof up into sections labeled A through E.

In the figure B. above, a sketched portion is a basic triangle. As we did in the first example, measure the length of the eaves, and the vertical line from the eaves half way point to the peak. Multiply these numbers, and then divide the answer by two./2 = 270 square feet

S1 = /2 = 135 square feetS2 = 50 × 15 = 750 square feetS3 = /2 = 135 square feet

Know Your Alternatives: Shingle Recycling

Landfilling your roofing waste is only one way to go. Shingle recycling is becoming increasingly more popular in many areas, and it generally costs a lot less than sending your materials off to the dump. Recycled shingles can be used to create asphalt roads and pavement, and thats several tons of waste youve just diverted from the landfill! Recycling companies are usually more than happy to help you plan your waste removal, and its certainly one way to green up your reroofing project.

Find today’s best prices for your home improvement project.

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Figure Out Your Homes Footprint

If you use the square footage of your home, youll only get a vague idea of what the square footage of your roof is. Thats why you have to figure out your homes footprint.

A person of average height will have a stride somewhere between 2 to 2.5 feet. To figure out your homes footprint, you can step off the dimensions of your roof by counting the steps you take to get the length of your home. You will then step off the width of your home.

After stepping off the length and width of your home, youll multiply the two numbers to get your homes footprint.

Length x width = your home’s footprint

Your calculations are going to be off, but measuring this way can give you a basic idea of your homes footprint. Keep in mind, square footage of a house does not equal the square footage of a roof.

How Many Square Feet Does A Bundle Of Shingles Cover

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One bundle of shingles covers roughly 33 square feet of roof. Some manufacturer bundles will cover slightly less and will range from 28 up to 33 square feet.

For some brands and types, the square feet per bundle may vary. A bundle of one type of shingle may have one extra than a bundle of the same type and brand. Some bundles will indicate a shingle minimum on the package. If that is the case, the square footage of the bundle will also vary, but not by much and it will always be at or around of 100 square feet.

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Find The Area Of The Footprint Of The Roof

To calculate a roofs dimensions, you need to measure the roof as if it were flat, then account for roof pitch, calculate square footage, and finally determine how many squares of material are required for the roof.

The calculator above can handle all of this, simply enter the length, width, and pitch, and it will determine the size of the roof in squares.

Start by measuring the roofs length and width in feet as youre standing on the ground. Remember that the length and width need to be found for the roof, not the house, so take into account that the roof overhangs the building.

Then determine the area of the roof as if it were flat. Multiply the length by the width in feet to get the area measurement.

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 90-degree 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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What Is A Square In Roofing

A roofing square is the amount of roofing material required to cover 100 square feet of roof. When calculating the number of shingles you need to cover your roof, youll calculate the area in terms of squares. Therefore if you have 2100 square feet of roof, youll need 21 squares of roof material.

A square of shingles is the number of shingles needed to cover a square of roofing. Whereas a bundle of shingles can vary in square footage, a square of shingles is always 100 square feet. This makes it easier when purchasing roofing materials since manufacturers will package 3 or 4 bundles of shingles to add to an even square.

A square in roofing is always 100 square feet. This refers to the square footage on the roof surface. It doesnt necessarily have to be a perfect square and is a quick way to calculate the quantity of roofing material that youll need for your job.

Youll always need more shingles than youd think to cover a square of roofing. Even if a shingle is 12 wide, some of that is covered by the shingle on top of it. Therefore, only about 6 to 8 of each shingle is showing. Thus, for standard 3-tab shingles, you may end up with 80 or more shingles in one square of roofing.


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