Roofing projects can be daunting, especially when it comes to estimating materials. One key term you’ll encounter in the world of roofing is “square.”

But what does it mean, and how do you calculate square roofing? In this straightforward guide, we’ll break down the concept of roofing squares, explain how to calculate them, and provide real-world examples to help you grasp this essential roofing metric.

Understanding Roofing Squares

First things first, what exactly is a roofing square? In roofing lingo, a square is a unit of measurement that represents 100 square feet of the roof’s surface area. It’s used to simplify calculations and material estimates.

Roofing materials like shingles and underlayment are often sold by the square, so knowing how to calculate squares is essential for planning your roofing project.

Calculating Roofing Squares

To calculate the number of squares needed for your roofing project, follow these steps:

  1. Measure Your Roof: Begin by measuring the length and width of each roofing section. For example, let’s say your roof has two sections: one measuring 30 feet by 20 feet and another measuring 40 feet by 25 feet.
  2. Calculate the Area of Each Section: Multiply the length by the width of each section to find the area. In our example:
    • Area of Section 1 = 30 feet x 20 feet = 600 square feet
    • Area of Section 2 = 40 feet x 25 feet = 1,000 square feet
  3. Add Up the Areas: Total the areas of all sections. In our case, 600 + 1,000 = 1,600 square feet.
  4. Convert to Squares: Divide the total area by 100 to get the number of squares. For our example, 1,600 square feet ÷ 100 = 16 squares.

So, your roofing project would require approximately 16 squares of roofing materials.

Real-World Example

Let’s take a real-world scenario: You’re planning to re-roof your house, and your contractor informs you that your roof measures 2,500 square feet. To determine the number of squares needed:

  • Total Roof Area = 2,500 square feet
  • Number of Squares = Total Roof Area ÷ 100 = 2,500 ÷ 100 = 25 squares

You’ll need 25 squares of roofing materials to cover your entire roof.


Calculating square roofing is a straightforward process that simplifies material estimates for your roofing project. By breaking your roof into sections, calculating their areas, and converting to squares, you can accurately determine the amount of roofing materials required.


As a civil engineer and roofer, I love to share the experience that I have gained through the last couple of years. In the roofing industry, practical experience is a very crucial fact that can help you a lot. Hence, I want to help you with my blog.

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