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How to Calculate Roof Area

To calculate your roof area, simply multiply your roof length by your roof slope height, and multiply this by two. This should give you the total area of your roof, not accounting for a chimney or other sections of your roof not covered by tiles

Things You Will Need

  • Square footage of your house

  • Pitch of your roof

  • Calculator

  • Paper and Pen

Tip

This calculation will give a solid estimate for a single slope roof and a simple gable roof with a single pitch. For more complex roof lines with multiple pitch angles, it’s a little more complicated but the same steps can be followed; just break down the roof into separate sections with a different square footage for each different pitch angle.

Step 1: Sketch Roof Outline

Sketch the roof outline using ground measurements as shown in Figure 1 below. Knowing the longest dimension first will help you to scale your drawing appropriately.

Step 2: Fill in Roof Details

Measure and sketch out dormers, hips, valleys, diagonal distances and protrusions or overhangs. Chimneys, vents, skylights and pipe sizes will need to be measured to calculate trims and flashings needed for the job.

Pro Tip: You may need binoculars to count units of existing roof materials in unreachable areas. If different pitches exist on adjacent sides of a valley or hip, it’s length can be determined by treating the hip or valley as the diagonal (hypotenuse) of a right triangle on the roof pane next to it.

Roof Outline Plan Drawing

Figure 1. Sketching Your Roof Plan

Step 3: Determine Roof Pitch

Pitch refers to the angle of the roof, or how steep it is. Measured by inches of rise (vertical measure) over 12 inches of run (horizontal measure) In the gable diagram in figure 2. (below) there are 4 units of rise and 6 units of run. This can be converted to units of rise over 12 by understanding that cross products in step 2 must be equal. There Therefore 4 x 12 must equal 6 x X. Step 3 shows that X must equal 48 divided by 6. Therefore X equals 8 and the pitch is 8/12.

Formula for Calculating Roof Pitch

Figure 2. Calculating Roof Pitch

A Note About Pythagorean Theorem (Yes, You Need It in Real Life)

If you know the measurement of two sides of a right triangle, but not the third side, then the Pythagorean Theorem from 8th Grade geometry is your best friend. In Figure 2 above, rise squared (multiplied by itself) plus run squared equals the diagonal squared. In the diagram,  a+ b2 = c2. If the rise is 42 + 62 = c2, then 16 + 36 = c2 – So c = the square root of 52. Pythagorean Theorem tells us that the gable (diagonal) length is 7.21’ or about 7’ 3”.

Roof Pitches in Degrees
Use Our Roofing Calculator

Step 4: Calculate The Simple Roof Areas

On a simple hip or gable roof, multiplying the eave to ridge length by eave length will give the area to be multiplied by pitch factor. Ridge vent openings are best finished with coil rather than partial shingle. Using flat coil stock allows the ridge caps to lay flat and can also be formed with an extra water stop at the ridge opening.

Area for the roof in Figure 3 is 1784 ftThe blue dash line divides the roof into 2 rectangles. There is a small area calculated as 8/12 that is actually 4/12. On a small area such as this, it is better to err on the side of the higher pitch since it should not significantly affect the total.

Pro Tip: Pythagorean Theorem can be used to calculate the length of the valleys. A general rule of thumb is to add at least 12” lineal inches of valley material to be safe.

Plan for Calculating Simple Roof Areas

Figure 3. Calculating Simple Roof Areas

Step 5: 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 (see Pitch Factor Chart bottom of page). 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 77ftthat 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 2053ftx 1.202 = 2468fttotal roof area.

A Note about complex roofs: Complex roofs need more accessories and trims than“easy” roofs – resulting in a slightly higher total cost/square foot.

How to Calculate Area for Complex Roof

Figure 4. Calculating Complex Roof Area

Step 6: Measuring or Calculating Gable and Hip Lengths

 The slope factor is also used to determine gable lengths when the run length is known. For example, in Figure 4 the bottom left gable measures 16’ across from eave to eave and therefore has a run of 8’. When this is multiplied by 1.202 the gable distance is 9’8” (9.62’ rounded up to nearest inch). Note that this run can also be multiplied by the hip/valley factor of 1.563 to get a valley length of 12’6”.

Record all your calculations on your drawing as seen in Figure 5 below.

Completed Plan Drawing of Roof with Measurements

Figure 5. Completed Roof Plan Drawing

 

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Roof Measurement Online

Calculate My Roof Size

Multiply your house length by your house width to get the area. (For example, 40 feet x 30 feet = 1,200 square feet.) Next, multiply the area by your roof’s pitch. (1,200 x 1.05 = 1,260 square feet.)
 

Acreage Calculator – Measure the area of a plot of land

The easiest way to measure the acreage of a plot of land is to start by entering an address that is associated with the plot of land you need the area of. In rural areas where an address may not be available, you can enter the cross street or even the GPS coordinate of a point on the land. For GPS coordinates be sure to enter the latitude followed a comma then the longitude ex. (41.87811, -87.629798). In any case this will place a marker that you can use as a reference point to draw the area on the map. Once you are finished drawing the area calculator will display the area of the shape above the map.

How to use the google maps area calculator tool to measure a roof

Special precautions must be taken when measuring the area of a roof. The images that appear on google maps are often at a slight angle, which combined with the angle of a roof can cause errors. For this reason it is best to outline the roof at points which are all at the same elevation. On a simple house for instance you would only click on the corners of the roof and not on any points along the peak as that would cause an error. After measuring the area of the footprint you can estimate the actual roof area based on the angle of the roof. Similarly if you using the area calculator tool to measure a roof with multiple levels, you should do the individual section separately. The google maps area calculator is not 100% accurate. Do not rely on this tool as your only resource in making important decisions.
 

Roofing Professionals

SkyRoofMeasure is a property measurement service created by roofing experts for roofing experts to provide a new level of accuracy, simplicity and affordability. Gone are the days of scaling damaged roofs for accurate measurements. SkyRoofMeasure reports make it easy to provide your customer with a quick, comprehensive overview of their roofing project and aids in the presentation needed to close the deal or ever having to set foot on a roof.

Benefits:

  • Simple pricing
  • Quick turnaround
  • Comprehensive premium report available
  • Friendly, knowledgeable customer support
  • Precheck for imagery, just give us a call
  • Multi-structure summary, which breaks out the measurements for each structure individually (i.e. house and detached garage)
  • PDF and XML files provided for inclusion into estimating software

Features of a Roof Report

  • Accurate Roof Pitch Measurements. Click here for more details Please.
  • Roof Measurements including AreaRakesRidgesHips and Valleys, and every edge is separately measured and identified.
  • CAD style drawings with colored lines identifying every type of roof edge
  • Online access to your Roof Reports for your Employees, Subs and Suppliers with no software to install
  • Multiple image providers for over 99% coverage of the USA & Canada
  • Also supports file formats such as XML,RXF,DXF/DWG AND WRL
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How do I calculate the size of my roof?

To find your roof’s total square footage:
  1. Measure the length and width of each plane on the roof (including dormers) then multiply length times width.
  2. Add the square footage of each of the planes together.

How do I calculate roof covering area?

To calculate your roof area, simply multiply your roof length by your roof slope height, and multiply this by two. This should give you the total area of your roof, not accounting for a chimney or other sections of your roof not covered by tiles. Follow Us for more details Please!

How do you calculate rafter length?

If you are calculating rafter length from the center of the ridge beam (as shown below), you will need to subtract half of the thickness of the ridge beam from the top end of the rafter. For example, if the ridge beam is 1.5 inches thick, subtract 3/4 of an inch from the overall rafter length.

Estimate Roofing Costs

Measure the square meter area of the roof you want replaced. The range of prices to replace your roof is: $50 to $95 per square meter. So multiple this rate against the square meter of the roof you want replaced.
 
Average Cost to Replace a Roof 
House (& Roof**) by Square FootRe-Roofing Cost*
1,000 (1,054)$4,000 – $5,500
1,100 (1,160)$4,200 – $6,000
1,200 (1,265)$4,500 – $6,500
1,500 (1,581)$5,500 – $8,000

Roof Pitch

Roof pitch (or slope) tells you how many inches the roof rises for every 12 inches in depth. An Example of a roof pitch would be a “6/12 pitch” which means that the roof rises 6 ” for every 12″ inward towards the peak (or ridge). There are two suggested ways to measure a roof pitch.

Are flat roofs more expensive?

While flat roofs can cost more than pitched roofs and often require more maintenance, lower-sloped roofs have a clear advantage to homeowners. Flat roofs have large overhangs that do not block light because of their low slope.

How much does it cost to roof a 2200 sq ft house?

In general, the replacement cost for asphalt shingles on a 2,200-square-foot home will range from approximately $8,200 to $12,000.
 
aerial roofing

How do you read a roof blueprint?

Are Blueprints Still Being Used? Blueprints are still being used to this day. However, they are no longer blue and aren’t called blueprints. They are now referred to as drawings or plans.

Determine the square footage of one floor of your home. (For example, if you have a two-story home that’s 2,600 square feet, one floor would be 1,300 square feet.) Multiply this number by your most recent result to get the estimated square footage of your roof. (1,300 x 1.05 = 1,365 square feet.) Follow Us!

Why the roof plan is important?

Roof leakages are a common problem in buildings that are not properly structured. Frequent roof leakages will lead to damage of electronics, furniture and inventory in your homestead and office. It is vital to ensure your roof is sealed correctly and does not give any room to water leakages or direct sunlight rays.
 
A site plan can show:
  • property lines.
  • outline of existing and proposed buildings and structures.
  • distance between buildings.
  • distance between buildings and property lines (setbacks)
  • parking lots, indicating parking spaces.
  • driveways.
  • surrounding streets.
  • landscaped areas.

What do roof plans include?

In simplest terms, a roof plan is a diagram or drawing that shows the proposed development of a roof. It contains information about the roof structure, including everything from draining and ventilation locations to the size, shape, and placement of the components.

What do symbols on blueprints mean?

Material symbols are used to represent materials or contents on floor plans, elevations, and detail drawings. Different symbols may be used to represent the same item on these drawings. The outline of the drawing may be filled in with a material symbol to show what the object is made of.

Tips on How to Read a Site Plan

  1. Find The Title Block. In the bottom right corner of most plans, you’ll find what’s called a title block. …
  2. Learn the Plan’s Scale. …
  3. Determine the Orientation of the Plan. …
  4. Know the Datum Point. …
  5. Note the Site’s Contours. …
  6. Locate Existing Structures.

How is the roof plan different from the roof framing plan?

A roof plan is used to show the shape of the roof . The roof framing plan is similar to the roof plan but in addition to showing the shape of the structure and the outline of the roof, it also shows the size and direction of the framing members use to frame the roof.
 
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The Benefits of Satellite Roof Measurements

Are satellite roofing estimates accurate?

Get Accurate Measurements AND Estimates in Minutes: Satellites are more accurate than the most experienced contractor’s hands. You’ll get EXACT measurements of your roof with no human error. We’ll even provide an estimate for costs based on the average roofing materials.

How do you measure a roof on Google Earth?

  1. On your computer, open Google Earth.
  2. Search for a place, or select a location on the globe.
  3. On the left, click Measure. . …
  4. Click the map to set measurement points.
  5. To remove a point, on the right, click Undo .
  6. To complete your line measurement, double-click on your last point, or click Done .

Can drones measure roofs?

Drones present a unique opportunity for getting a clear view of your rooftop and allowing you to get precise roof measurements. A variety of roof measuring applications and programs already take advantage of high-resolution drone imagery to get accurate roof measurements.

How much should I charge for drone pictures?

How much does drone photography cost? The national average cost for aerial or drone photography is $250–$350. Length of the photography shoot, resolution, and services performed all affect the total cost of aerial photography and videography. A shoot longer than 90 minutes may add $50 – $70 per additional hour.

Roof Sheet Calculator

  1. Take Roof Sheet Measurements.
  2. Calculate Carport or Structure Total m² Area. Enter Width and Length(water flow direction) in meters eg. 5.35m = 5.35. Enter Width of Carport : m. Enter Length of Carport (Water Flow Direction): m. Total m² Area =
  3. Calculate Number of Roof Sheets Required.

 

The formula for weight calculation is:
  1. l = length in mm.
  2. w = width in mm.
  3. t = thickness in mm.
  4. η = Specific material density ( e.g.: steel = 7.85 kg / dm³)

How do I get an accurate roof measurement?

Measure the base area of your property

That will be the roof base width. Then, measure the distance of the other side of the structure from the edge of the eave to the other. That will be the roof base length. Multiply those figures together to get an estimate of the base area for the roof structure. Please Follow Our Working process!

How do roofing estimates compare?

Check out these four tips to help you choose the right roofer to work on your home:
  • Compare Roofers. No two roofers are made alike. …
  • Ask About the Materials Each Roofer Will Use. Your estimate should go into detail about the materials involved. …
  • Analyze Workmanship and Material Warranties.
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Roof measuring tool

Measure the base area of your property
That will be the roof base width. Then, measure the distance of the other side of the structure from the edge of the eave to the other. That will be the roof base length. Multiply those figures together to get an estimate of the base area for the roof structure.

How Many Roofing Shingles Do I Need?
  1. Measure the length and width of each plane on the roof (including dormers) then multiply length times width.
  2. Add the square footage of each of the planes together.

MEASURING ROOF PITCH

Simply locate a roof rafter board, place the end of the level against the bottom edge and measure from the 12-inch mark vertically to the bottom edge of the rafter. This will give you the rise over run, or pitch. For example, if you measure 4 inches, the pitch of your roof is 4:12.

How do you measure gutters from the ground?

Measure the length in feet of each roof edge where you will install seamless gutters, using a tape measure laid on the ground. Round the measurement up to the next whole foot. If the gutter must turn corners along the roof edge, measure the length in feet of each segment of the roof edge.
 

How do you measure a roof with a tape measure?

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With your measuring tape, measure vertically from the top point to the bottom point of your roof. (This is also called the rise.) Repeat this over 12 inches, then place the measurement over “12”. (For example: If your rise is 4 inches over 12 inches, then your slope measurement is 4/12.). Follow Us for more details Please!

How do you estimate roofing costs?

Measure the square metre area of the roof you want replaced. The range of prices to replace your roof is: $50 to $95 per square metre. So multiple this rate against the square metre of the roof you want replaced.
 
What Questions Should You Ask Your Roofing Contractor?
  • Is the company a licensed contractor and a member in good standing of a trade association? …
  • How long has the company been in business? …
  • Will the company provide referrals or references from previous jobs? …
  • Does the roofing contractor or the company carry insurance?
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Satellite Roof Measurement USA

Satellite temperature measurements are inferences of the temperature of the atmosphere at various altitudes as well as sea and land surface temperatures obtained from radiometric measurements by satellites. … Weather satellites do not measure temperature directly. They measure radiances in various wavelength bands.

Contractors will also be able to upload drone images or blueprints to measure. Once mapping is completed, the user receives a final, downloadable report on the area, pitch, direction, and edge lengths of the roof, which helps determine how much roofing material to purchase, the amount of time the project will take, and the total cost to the customer. Get to know more about our working Process! 

What does a satellite measure?

Satellites looking toward Earth provide information about clouds, oceans, land and ice. They also measure gases in the atmosphere, such as ozone and carbon dioxide, and the amount of energy that Earth absorbs and emits. And satellites monitor wildfires, volcanoes and their smoke.

How to Get Your Satellite Roof Measurements

You’re a few simple steps away from your aerial roof measurements (and a better back!):


    • Enter Your Details: Give us your name, email, and phone number so we can contact you.

    • Enter Your Address: Let us know which roof to measure.

    • Leave Notes: Tell us to exclude the garage or anything else we should know before sending your measurements.

  • Confirm Your Address: Hey, we just want to know we’re measuring the right house!


That’s it! Just proceed to the payment page (if necessary), and you’ll get your measurements instantly. See, wasn’t that way better than spending all day on the roof in the hot sun?

From there, you’ll create your free toolbox account where you’ll have access to your measurements and a ton of tools to make your roof project easier, cheaper, and faster. Follow Us for more details Please!

Roofing Professionals

SkyRoofMeasure is a property measurement service created by roofing experts for roofing experts to provide a new level of accuracy, simplicity and affordability. Gone are the days of scaling damaged roofs for accurate measurements. SkyRoofMeasure reports make it easy to provide your customer with a quick, comprehensive overview of their roofing project and aids in the presentation needed to close the deal or ever having to set foot on a roof.

Benefits:

  • Simple pricing
  • Quick turnaround
  • Comprehensive premium report available
  • Friendly, knowledgeable customer support
  • Precheck for imagery, just give us a call
  • Multi-structure summary, which breaks out the measurements for each structure individually (i.e. house and detached garage)
  • PDF and XML files provided for inclusion into estimating software
 
roofer

How to Calculate Roof Area – DIY

Multiply your house length by your house width to get the area. (For example, 40 feet x 30 feet = 1,200 square feet.) Next, multiply the area by your roof’s pitch. (1,200 x 1.05 = 1,260 square feet.)

Calculate the exact roof area

Follow these steps to figure out the exact area of your roof:

  • Take your pitch number and divide it by 12. For example, if your pitch is 4 in 12, you need to divide 4 by 12. The answer will be 1/3.
  • Next, you need to square your outcome. In our example, 1/3 squared will yield 1/9.
  • Thereafter, add 1 to your result: 1/9+1=10/9
  • Calculate the square root of your new number: The square root of 10/9 is 1.05.
  • Measure the length of your house – including the overhangs.
  • Measure the width of your house – including the overhangs.
  • Multiply the length of your house by its width to get the area. For example, 40 feet x 20 feet = 1,200 square feet.
  • Thereafter, multiply the area by the pitch to get the true roof area: 1,200 x 1.05 = 1,260 square feet. 

In order to allow for ridges, hips, and waste, it is advisable to add 10% of your final roof area for a gable roof or 17% in the case of a cottage roof. Follow Us!

As a result, you should be working with 1,386 sq. feet or 1,474 sq. feet for a gable roof or a cottage roof respectively. Get to know more about us!

Roofing Terms — AskARoofer

Know Your Roof Type

There are three main types of roofs common on most of the homes in the Dallas area. There is the one-plained square or rectangle shed roofs that can be measured up in seconds. Another common roof is the gable which goes up one side, meets in a triangle, and then slopes down the back side. These are also easy to measure but involve a little bit of adding for the total square foot. Hip roofs are the third type and are a little trickier because they feature four triangle-typed shapes that angle up towards a central peak.

Get a Friend, Get On the Roof, and Measure Your Roof

The first way to measure your own roof involves physically climbing up with your tape and taking down the measurements. Roofs are measured in square foot so if you had a simple rectangle shed that was 12′ x 12′ you’d have 144 square feet you need shingled. Finding the square footage of a gable roof works in much of the same way, if the two plains are both 15′ X 30′ you’d have 450 square feet on both sides, or 900 square feet total.

Hip roofs require some geometric calculating to get the proper square footage. Generally hip roofs feature two trapezoids and two triangles. To calculate the area of a trapezoid you add the length of the bottom base plus the length of the top base and multiply it by the height. You take that number and divide it by 2 to get the area of one trapezoid base. The area of a triangle is calculated by taking the base multiplied by the height and dividing by two. Hip roof square footage is then figured by adding all the sides together.

Parts of a Roof & Roofing Terminology | S&K Roofing, Siding and Windows

Roofing Materials

The purpose of calculating the precise measurements of a roof is to ensure that the appropriate amount of roofing materials are ordered – whether you have a shingles roof, gable roof or metal roof. Here are some common roofing materials and considerations for each:

Shingles

Shingles are typically sold in bundles. Depending on the type and brand of shingle, it may take a different number of bundles to make a square. When cost comparing shingles, remember to base price on squares and not on bundles.

Metal Roofing

Metal roofing is typically sold by the sheet or panel. To determine the number of sheets or panels necessary to cover the roof, divide the width of the roof by the sheet or panel coverage width.

Other Roofing Materials

The basic square footage and length calculations detailed above should help estimate overall cost for other materials. Additional roofing materials that should be accounted for include items such as leak barrier, deck protection, drip edge, rake edge, ridge vents, and hip and ridge caps.

 

roof

Roof Measurements from Satellite USA

How do you measure a roof on Google Earth?

  1. On your computer, open Google Earth.
  2. Search for a place, or select a location on the globe.
  3. On the left, click Measure. . …
  4. Click the map to set measurement points.
  5. To remove a point, on the right, click Undo .
  6. To complete your line measurement, double-click on your last point, or click Done .

Are satellite roofing estimates accurate?

Get Accurate Measurements AND Estimates in Minutes: Satellites are more accurate than the most experienced contractor’s hands. You’ll get EXACT measurements of your roof with no human error. … It’s 100% Safe: Did we mention no ladders, measuring tapes, heights, or hot sun? Yeah, this is way safer!

How do I get an accurate roof measurement?

Measure the width and length of each plane of the roof (including dormers), and then multiply those numbers to get the correct figure for the square footage of that area. Note any skylights, chimneys or other parts of the roof that would not require materials so you can subtract those measurements from your total area. Follow Us!!

How do you estimate roofing costs?

Measure the square metre area of the roof you want replaced. The range of prices to replace your roof is: $50 to $95 per square metre. So multiple this rate against the square metre of the roof you want replaced.

Which of the measurements is the most accurate?

The measurement 4.00 mm is most precise because it is measured with an instrument of minimum least count.

Can drones measure roofs?

Drones present a unique opportunity for getting a clear view of your rooftop and allowing you to get precise roof measurements. A variety of roof measuring applications and programs already take advantage of high-resolution drone imagery to get accurate roof measurements
kak-pravilno-rasschitat-ploshchad-kryshi-16

Georgia Roofing Company: Roof Repair & Replacement

Roofing work requires a state license in Georgia for any project worth more than $2,500. The license falls under the category of Contractors License (Residential Basic) and is issued by the State Construction Industry Licensing Board. To be licensed, you’ll need to pass a trade exam, as well as a business and law exam.

NGE Roofing : NGE Roofing is one of the only roofing companies that offer a LIFETIME WARRANTY on shingles AND install. GAF certified contractor with A+ rating with BBB. NGE Roofing offers affordable roofing solutions and a Lifetime guarantee and satisfaction for every home that we work on. Our teams are experienced and qualified roofers. For more info on our Lifetime Guarantee and services offered, call or Text today. 
 
Increase the durability of your home’s roofs and gutters by getting in touch with NGE Roofing. This roofing company offers 10 percent off for past and present military members and first responders. Call (678) 400-5131 to request a quote.
 

What is the average age of a roof?

Homeowners with wood shake roofs should expect them to last about 30 years, while fiber cement shingles last about 25 years and asphalt shingle/composition roofs last about 20 years, the NAHB found. Climate and weather conditions, such as snow, hail and hurricanes, can cut the life span of all types of roofs.

Commercial Roofers

We offer quality craftsmanship on commercial roofing including metal, TPO and waterproofing. We are well-known for our fast leak repair on churches, hotels, restaurants, strip malls and warehouses. Time is money; so, you will appreciate our immediate response to minimize your downtime! If we can’t repair your roof leak within 24 hours, we will tell you in advance so that you can make other plans.

We repair and properly seal roof parts such as roof caps, vents, boots and flashing. Waterproofing services and thermoplastic polyolefin (TPO) installation are often available the same day, when you need fast commercial roof repair.

Residential Roof Replacement

We offer affordable roof replacement for homeowners in north metro Atlanta. We can replace most types of residential roofing within two days, extra-large or specialty replacements such as shake roofs or custom metal roofs may take three to four days depending on your roof design.

There are many great local roofing companies, but if you are seeking the hard-working roofers with the highest ethical principles, call us! In fact, all crew members at NGE Roofing have at least ten years of experience, and all project managers have at least twenty years of local roofing experience.

 
 
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