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How Do You Figure How Many Squares On A Roof

What Is A Roofing Square

How to Measure the Square Footage of 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. 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.

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Search our list of independent roofing contractors in the Owens Corning Roofing Contractor Network to find the roofing professional thats right for you.

How To Calculate The Number Of Roof Shingles Youll Need

Before you start the calculation, you need to be aware that shingles are sold by the square and by the bundle. A square of shingles will be the amount needed to cover an area of 100 square feet. The shingle bundles will be plastic or paper-wrapped bundles that are made to be light enough for a single person to carry. This means that if you are going to be using heavier shingles, you will need to have more bundles to cover each square foot.

It is common to use 3 bundles to a square of shingles. However, if you are using heavier shingles, you will require 4 to 5 bundles for a square. When you are using 3 bundles for a square, you will be getting 29 standard shingles in each bundle.

How You Get Shingles

When you are replacing your roof, you need to calculate the number of roof shingles you need. There is nothing worse than being short on shingles because you will only realize this close to the end of your project. Of course, there are some measurements which will need to be taken before you are able to calculate the number of roof shingles that you need.

The Measurement Method

If you do not have any safety equipment, you will need to use a ladder to get one measurement while the others can be made on the ground. Of course, this will be assuming that your home is rectangular. When using this method, you will need to measure the rake of the roof while standing on a ladder. This is the length from the peak of the roof to the edge where our ladder will be sitting.

Roofing Pitch For Square Roof Area

Finally, the more complex part, measuring your roofs pitch.

  • Estimate or calculate the pitch of your roof .
  • 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. .
  • Multiply the number of roofing squares by the following digits below.
  • Low Pitch: 1.07 x Roofing SquaresMedium Pitch: 1.185 x Roofing SquaresHigh Pitch: 1.36 x Roofing Squares

    NOTE:We understand a roofs pitch makes this process somewhat tricky. Enjoy Home Advisors free roofing square calculator right here.

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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 Much Sand And Cement Do I Need For 1000 Square Feet

    How Many Shingles In A Square Of Roofing ...

    How much sand and cement do I need for 1000 square feet? Ans. :- 210 cuft sand quantity required for 1000 square feet roof slab of 6 inch thick.

    Also, How many bags of concrete are needed for a 10×10 pad?

    Regarding this, how many bags of concrete do I need for a 10×10 slab?, at 4 inches thick, generally you will need approximately either 74 bags of 60lb or 56 bags of 80lb premixed concrete for a 10×10 slab, at 5 inches thick slab, either 93 bags of 60lb or 70 bags of 80lb premixed concrete are required, while at 6

    How many bags of cement do I need for 100 square feet of concrete? Ans. :- 7.6 no of cement bags are required for 100 sq ft rcc roof slab 4 inch thick m20 grade concrete. Ans. :- 7.6 bags , 9.5 bags & 11.4 bags cement are required for 100 sq ft rcc roof slab 4 inch, 5inch & 6 inch thick respectively in m20 grade of concrete.

    Read Also: New Roof Cost California

    How To Estimate Metal Roofing Panels

    A metal roof is one of the most durable material options for your home. When ordering supplies, it is important to estimate materials correctly to allow for an efficient installation process.

    Estimating the amount of metal roofing material you need starts with estimating the square footage of the roof itself.

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    How Roof Area Is Measured

    In order to find out how many shingles your roof will require, you first need to estimate its total square footage. This is done in three easy steps:

  • Start by measuring the width and length of your roof .
  • Multiply width x length .
  • To calculate the total square footage of the roof, add up every planes square footage.
  • Here are a few examples of different roof types:

    Recommended Reading: Proper Screw Placement Metal Roofing

    Roofing: Calculate The Number Of Shingles

    Roofing is a very important part of your house because it protects it from water. Without a watertight room water would be allowed to enter and stream down the walls in your house. It’s essential that the roof is in the very best condition.

    Pitched roofs are commonly weatherproofed by using shingles, and these are arranged so that they overlap one another. It’s important that you have the right number of shingles on your roof, because if you have too few then it won’t be waterproof. You will then need to go back to the store a second time to buy more. Ordering too many roofing shingles will waste money.

    There are a number of calculations that you can use to work out exactly how many shingles you need to correctly cover your roof. These calculations aren’t scary because you don’t need to worry about anything you learned in school.

    Step 1 – Calculating the Square Footage

    The first thing that you will need to do is work out the size of your roof in square feet. This is very easy, as it’s simply a matter of measuring the length and height of the room. Multiply the length and height of the roof together to work out the number of square feet that you need to cover. Remember to work out the total square footage around the whole of your house. For a simple room this will be very easy. However for larger, more complicated shapes you will need to work slowly.

    Step 2 – Working out Number of Squares

    Step 3 – Work out Number of Bundles

    Instructions For The Shingle Calculator

    How to measure a roof and calculate square feet. | 01/2020

    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.

    Recommended Reading: How Do I Know If My Roof Is Leaking

    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 Much Does A Square Of Roofing Cost

    The most frequent application for the term square throughout the roofing industry is in regard to pricing and ordering bundles of shingles, so it makes sense to cover the how much a square of roofing costs on average.

    In the interest of time, well use the state of Massachusetts as our example. Massachusetts roofers price their projects between $5 and $9 per square foot. We can convert cost per square foot to cost per square by multiplying the original number by 100. So in Boston, Massachusetts and the surrounding area, the cost of a square of roofing is between $500 and $900.

    Read Also: How Many Screws Per Square For Metal Roofing

    Why Should I Measure My Own Roof

    If you plan on re-roofing your own home then you will need to calculate materials so you wont waste your own time and money. If youre like most people, youll need to hire a professional.

    Knowing your numbers will help you figure out what roofing materials are within your budget and having your square footage handy is a great way to protect yourself from inflated quotes.

    How Do You Calculate Corrugated Sheets

    How Many Shingles In A Square Of Roofing ...

    Multiply the length of the roof by the width toestablish the surface area in square feet. For example, if thelength is 21 feet and the width is 10 feet, the surface area is 210square feet — 21 times 10 equals 210. Determine the width andlength of the metal sheets to be used.

    Considering this, how do you calculate the number of roofing sheets?

    Part 1Measure the length and width of each portion ofthe roof, multiply length by width for each plane, and thenadd the planes together for the total square footage.Determine the total number of squares. Divide thetotal footage by 100 to determine the number ofsquares in the roof.

    how wide are corrugated sheets? Length and WidthIt does not follow the peaks and valleys of thecorrugate.The two most common widths are 26 and 36 inches. Otherstandard widths include 24 and 39 inches. When calculating coverageusing the width and length of corrugated roofing,keep in mind that each piece will need to overlap by severalinches.

    Secondly, how do you calculate how many sheets of plywood do I need?

    Divide by the total square footage by the square footageof a sheet of plywood to find the number of sheetsrequired to cover the space. A 4×8 sheet of plywood is32 ft2. For example, if the area to be covered inplywood is 800 ft2 then 25 sheets ofplywood will be needed to cover it.

    What is the width of a corrugated iron sheet?


    Read Also: How Do You Know If Your Roof Is Leaking

    How Many Bricks Do I Need For A 1200 Sq Ft House

    Number of bricks quantity required for 1200 sq ft house:- in India, for a small residential house, for ground floor building, using thumb rule, for 1200 sq ft house, number of bricks required is calculated as = built up area × 8 piece, such as, bricks quantity = 1200 × 8 piece = 9600 nos, hence, on average 9600 number

    Finding The Total Roof Area

    Once the area of the roofs footprint is known, the overall roof area can be found by accounting for the roofs pitch. The pitch of the roof is the rise over a 12-inch run. Use our roof pitch calculator to find the pitch of your roof.

    Next, multiply the footprint of the roof by the multiplier below for your roof pitch to find the overall roof area.For example, a 4/12 pitch roof that is 100 square feet:

    100 × 1.054 = 105.4ft2

    Roof Pitch Area Multipliers

    Multipliers for common roof pitches that can be used to find the total area of a roof.


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    Why Use This Term

    A roofing square is a standardized way of thinking about roofing materials and is understood by everyone in the industry.

    The reason why the term is so prevalent is because there are so many types of roofs for residential and commercial buildings. For example, there are flat roofs, gable roofs and mansard roofs, and each has different dimensions.

    Calculating The Area From The Building’s Square Footage

    How to measure roof sections both from on the roof or from the ground
  • 1Find the square footage or square meterage of your home. You’ll need this information to estimate the area of your roof. You can find this information online on real estate websites or on your house or building title.XResearch source
  • Keep in mind that this estimation won’t include any areas like garages or enclosed patios that the roof covers. You may need to measure these rooms by hand to figure out the area.
  • To figure out the area of a square or rectangular room, measure length and width and multiply them together to get the area. Add that to your square footage total.
  • 2Measure the pitch of your roof in the attic. Mark a length of 1 foot on a long level, starting from one end. Hold the end you measured from against the bottom of a rafter so it’s sticking straight out horizontally and is level. From the 1 ft spot you marked on the level, measure upward to the rafter. The number is the first part of the pitch, while “12 inches” is the second part of the pitch. So if you measured a “5” going up, the pitch is 5/12, or 5 inches every 1 foot.XResearch source
  • You’re basically making a triangle. The level and measuring tape will make a right angle, while the rafter will be the hypotenuse of the triangle.
  • Most roofing calculators will accept this measurement as is, such as 5/12.
  • The pitch is important because it increases the area of the roof by stretching out the height.
  • For example, the slope factor for 5/12 is 1.08.
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    How Many Bundles Of Shingles Will You Need

    The average bundle of shingles covers 33.3 ft2, so three bundles of shingles are needed per square. Asphalt shingles range in price from about $25 per bundle for a standard 3-tab style to around $50-$75 or more for an upgraded architectural style.

    Since transportation is a major cost factor, expect prices to vary by location. A typical bundle of shingles weighs about 75 pounds, while some premium products can weigh over 100 pounds per bundle, so consider delivery of materials.

    How Many Nails Will You Need

    Nails will also be required for any roofing project. The average 3-tab shingle needs four nails per shingle. High wind areas and other types of shingles may need more. 320 nails will be needed to install a square of standard 3-tab shingles, assuming four nails per shingle and 80 shingles per square.

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    Headlap 1 Square Isnt Always Exactly 100 Square Feet

    If youre hiring a qualified contractor for your project, then you dont need to worry about this, but if youre replacing your own roof you need to understand headlap!

    Earlier we mentioned that a roofing square is equal to 100 square feet. While true in most cases, this calculation does not consider headlap.

    What is headlap? Headlap is the overlap of a row of shingles on top of the next row, which helps protect against water penetration. Because of headlap, a square of roofing shingles never really equals exactly 100 square feet of roofing when you line all the materials up.

    Put plainly as possible: one square of roofing is not 100 square feet exactly, but is enough to cover 100 square feet of roofing area. The materials themselves may, and often are, more than 100 square feet in total.

    Calculate The Complex Roof Areas


    Most roofs in Canada would be considered on the complex side. Multiple adjacent pitches, dormers, and turrets are common. Keep in mind that an experienced metal roofing contractor will need to factor in extended labour time for areas of your roof that will require precision metalworking skills.

    Start by finding the footprint area and multiply by the correct slope factor determined by pitch . In Figure 4 below, the dashed blue lines give a simplified view of the footprint. Multiply L x W to calculate the area for each rectangular section. Note the area of 77ft2 that needs to be subtracted for the recessed area.

    Once the footprint including overhang areas have been determined for each area, find the appropriate slope or pitch factor in the chart below. For example, a roof area with an 8/12 pitch has a slope factor of 1.202 so 2053ft2 x 1.202 = 2468ft2 total roof area.

    A Note about complex roofs: Complex roofs need more accessories and trims thaneasy roofs resulting in a slightly higher total cost/square foot.

    Figure 4. Calculating Complex Roof Area

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