Calculating the number of roof tiles you need doesn’t require a math wizard. Whether you’re repairing your roof or planning a renovation, this blog will break down how to calculate roof tiles without making your head spin. Simple steps, no fancy jargon, and practical examples ahead.

Step 1: Measure Your Roof

First things first, grab a tape measure and head to your roof. Measure the length and width of the area where you plan to install the tiles. Keep it simple – just get the dimensions in feet.

Step 2: Calculate the Roof’s Square Footage

Once you have the length and width, multiply them to find the square footage of your roof. For instance, if your roof is 40 feet long and 20 feet wide, your calculation would be: 40 ft x 20 ft = 800 square feet.

Step 3: Determine Tile Coverage

Different types of roof tiles have different coverage areas. Asphalt shingles, for instance, commonly cover around 33 square feet per bundle. Concrete tiles, on the other hand, might cover around 75 square feet per bundle.

Step 4: Divide to Conquer

Now, divide your roof’s square footage by the coverage area of the chosen tile. Let’s say you’ve chosen asphalt shingles. If your roof is 800 square feet, and each bundle of shingles covers 33 square feet, you’d do: 800 sq ft ÷ 33 sq ft per bundle = approximately 24 bundles.

Step 5: Consider Overlaps and Wastes

Remember, roofs aren’t perfectly rectangular, and you’ll have overlaps at the edges. To account for this, add around 10% to your calculated bundle count. In this case, you’d need about 26-27 bundles of asphalt shingles.

Step 6: It’s a Wrap!

That’s it – you’ve calculated the number of roof tiles you need. Now, you can confidently shop for your materials without overbuying or running short.


Calculating roof tiles is about straightforward math. Measure your roof, calculate the square footage, determine the coverage area per bundle, and account for overlaps and waste. With these simple steps, you can ensure you have just the right amount of tiles for your roofing project.

So, the next time you’re tackling a roofing project, remember these easy calculations. It’s like measuring ingredients for a recipe – follow the steps, and you’ll have a successful outcome. 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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