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Siding Buying Guide | Siding Measurement

Follow these steps for calculations you’ll use to learn how to measure for wood siding:

  • Measure height and width of each side. For each side, multiply height times width to get the total square feet.
  • Measure other areas not included in the sides, such as gables, dormers and more. For triangle areas, measure from the…
  • Measure the height and width of each window, door…

What Is a Roofing Square?

In roofing, one square equals 10 X 10 ft., or 100 sq. ft. This unit of measurement determines how many shingles you’ll need for every 100 sq. ft. of rooftop. As you prepare for your roofing project, you’ll use squares to determine the amount of roofing materials you need, from asphalt shingles down to the underlayment.

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How to Calculate a Roofing Square

Before beginning, make sure you can safely access your roof—if you can’t, contact a roofing professional for help.

Grab your measuring tape, level, pen and paper, roof safety equipment, and your ladder. With these in hand, you can measure your roof in five simple steps.

  1. Determine the number of planes. Your roof is made up of planes. If you have a flat roof, it has one plane. If you have a simple gable roof, it has two planes. The more architectural details your roof has, the more planes you will have to measure.
  2. Measure each plane. Find the length and width of each plane. Then, multiply those two numbers together to find the square footage of that plane. For example, a 35 ft. X 36 ft. plane = 1260 sq. ft.
  3. Find the total of all the planes. Add the square footage for each roof plane into one total. 1,260 sq. ft. + 1,260 sq. ft. = 2,520 sq. ft.
  4. Divide to find the squares. To find how many squares are on your roof, divide the total square footage of all your planes by 100. In our example, the total was 25.2 squares — 2,520 sq. ft. divided by 100.
  5. Remember the roof slope. Roof slope indicates how steep your roof is and may increase the number of squares of materials you need. Roof slope is calculated by determining how many inches a roof rises vertically for every 12 inches it extends horizontally. For example, if that vertical rise is 4 inches, the slope is 4:12.

You can use an online shingle calculator or roof slope calculator to help run the calculations. Once you know the total number of squares you want to cover, consider adding up to 10% in overage to account for error and installation.

STEP-BY-STEP GUIDE: HOW TO MEASURE A ROOF FOR METAL ROOFING INSTALLATION

It’s important to measure your metal roof before you begin your project so that you can estimate your metal roofing material as accurately as possible. Here’s our step-by-step guide for measuring the total roof area for installation:

Step 1: Start by sketching out a top-down view of your home’s roof. Don’t worry about getting the scale or dimensions perfect yet.

Step 2: Measure the length of your roof. Do this by measuring from one of the edges to the opposite side. Write down the number for the next step.

Step 3: Next, figure out the width of the metal that you’re installing. Then, divide the length of your roof by the width of the metal. For example, your roof’s length might be 30 linear feet (360 inches). Divide that by 24-inch standing seam roofing, and you get 15. This will be the number of panels you’ll need for one side of the roof.

Step 4: Repeat Step 3 for the other side of the roof. It’s important to measure both sides in case they slightly differ in size.

Step 5: Measure from the fascia board (board attached to the roof joists) to the ridge (peak) of the roof. This will determine the length of the metal roofing panels you’ll need for one side of the roof.

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Measure My Roof

Measure the length of the roof at its base along one side of your house. Use a ladder, if necessary, to get the most accurate measurement. Measure along the roof’s angle to get the width of your first roof area. Multiply the length by the width to get the area in square feet. Follow us for more details please.

Sky Roof Measure provides accurate roof measurements in .esx format, for use with Xactimate, at affordable prices. We now also provide wall measurement reports in PDF format .

Call us : (315) 926 1777

Email: [email protected]

Our service is quick and easy to use.  Sign up for a free account today and ordering is as easy as 1, 2, 3!

  1. Enter the address where you need a measurement on the home page, and confirm the location on the satellite map view.
  2. Choose the type of report you need – commercial or single family home and/or wall report – and add any special instructions.
    • Add your reference number or claim ID to the order for easy tracking.
    • Let us know if you have special requirements, such as including secondary structures on single family home orders.
  3. Confirm your order and checkout.  You can also order multiple reports on a single invoice including an entire campus. 

Most customers pay by credit card.  Let us know if you need to pay by check.

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.

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.