When it comes to roofing, one of the most common questions is, “How much roofing material do I need?” You don’t want to end up with too little and halt your project or buy too much and waste resources. In this blog, we’ll walk you through a simple way to calculate how much roofing material you need.

Step 1: Measure Your Roof’s Area

Start by measuring the area of your roof. You can break it down into simple shapes like rectangles and triangles. Measure the length and width of these sections and then calculate the area for each.

Example: Imagine your roof as a giant jigsaw puzzle. Measure each puzzle piece separately.

Step 2: Add the Areas Together

Once you have the areas of all the sections, add them together. This gives you the total square footage of your roof.

Example: Just like you combine all the puzzle pieces to complete the picture.

Step 3: Consider Overhangs

If your roof has overhangs or eaves, don’t forget to include them in your calculations. Measure the length and width of these overhangs and add them to your total square footage.

Example: Think of overhangs as the frame around your puzzle. They’re part of the whole picture.

Step 4: Roofing Material Coverage

Now that you know your roof’s square footage, it’s time to figure out how much coverage your chosen roofing material provides. This information is usually available on the product packaging or from the manufacturer.

Example: It’s like knowing how many square feet a gallon of paint can cover.

Step 5: Calculate the Amount Needed

Divide your total roof square footage by the coverage provided by the roofing material. This gives you the number of units or bundles you need to purchase.

Example: If your roof is 1,500 square feet, and one bundle of shingles covers 100 square feet, you’ll need 15 bundles.

Step 6: Account for Waste

It’s always a good idea to account for some waste when estimating materials. Roofing projects may require extra material for cut-offs, mistakes, or repairs.

Example: Just as you buy extra tiles when working on a craft project, having a bit more roofing material can be a lifesaver.


Calculating how much roofing material you need is like solving a straightforward puzzle. By measuring your roof’s area, considering overhangs, and factoring in material coverage, you can estimate the quantity accurately.

Remember, it’s better to have a little extra than run out in the middle of your project. With these simple steps, you can confidently plan your roofing project and ensure you have the right amount of material to get the job done. Happy roofing!


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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