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Comprehensive Guide: How to Calculate the Number of Roof Tiles Needed for Your Project

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At First Class Roofing, we understand the importance of accurate calculations when it comes to purchasing roof tiles for your new installation or replacement project. Buying the right quantity of tiles is essential to ensure the smooth progress of your job, maintain your schedule, and stay within your budget. In this comprehensive guide, we will walk you through the process of calculating the number of roof tiles needed, taking into account various factors that can influence the quantity required. By following our step-by-step instructions, you’ll be able to make an informed decision and order with confidence.

Factors to Consider When Ordering Tiles

Before we delve into the calculation process, let’s take a moment to explore the key factors that influence the number of tiles you need to purchase:

Tile Size

It’s important to note that tiles come in various sizes, and the choice of tile dimensions will directly impact the quantity required. Generally, larger tiles will cover a wider area compared to smaller ones. Therefore, understanding the dimensions of the tiles you prefer is crucial for an accurate calculation.


Each type of tile comes with a specific requirement for overlap, known as “headlap,” which affects the area covered by each tile. The larger the headlap, the more tiles you will need to achieve full coverage. Headlap is a critical consideration, as it directly impacts the number of tiles required for your project.

How to Measure Your Roof

To calculate the number of tiles needed, you must first measure the roof area accurately. Follow these steps:

  1. Measure the Roof Width (m): Start by measuring the width of your roof in meters.
  2. Determine the Roof Slope Height (m): Measure the vertical height of the roof slope in meters.
  3. Calculate Half Roof Area (m²): Multiply the roof width by the slope height. This calculation will give you half the roof area.
  4. Obtain the Total Roof Area (m²): Multiply the half roof area by 2 to calculate the area of both sides of the roof.

Congratulations! You now have the total area of your roof in square meters, which is a crucial piece of information for determining the quantity of tiles required.

How Many Tiles Do You Need?

Once you have determined the area of your roof, you can proceed to calculate the number of tiles needed. Follow these simple steps:

  1. Refer to Manufacturer’s Specifications: Consult the manufacturer’s specifications for the specific tile range you have in mind. Manufacturers often provide guidelines on the number of tiles required per square meter, simplifying the calculation process.
  2. Multiply Roof Area by Tiles per Square Meter: Multiply the roof area (in square meters) by the recommended number of tiles per square meter provided by the manufacturer.
  3. Result: Quantity of Tiles Required: The product of the above calculation will give you the quantity of tiles needed to cover your roof accurately.

Marley Eternity Tiles

Let’s take a closer look at the popular Marley Eternity range of tiles. By understanding the details of this specific tile range, you can gain valuable insights into estimating your requirements. For example, let’s assume you need 3200 tiles for your project:

  • Tile Range: Marley Eternity Tiles
  • Tile Size: 265 x 165mm
  • Pitch: 30° – 90°
  • 100mm Roof Gauge: 60 tiles/m²
  • 115mm Vertical Gauge: 53 tiles/m²
  • Tiles per Pallet: 1260
  • Roof Cover per Pallet: 21 m²

Based on these specifications, you can calculate the number of pallets required to fulfill your needs.

How Many Redland Tiles Do You Need?


let’s explore another popular tile option: Redland tiles. By examining the details of this range, you can further refine your estimation process. Consider the following specifications:

  • Tile Range: Redland Tiles
  • Tile Size: 266 x 165mm
  • Pitch: 35° – 90°
  • 35° – 89° Tile Qty: 60 tiles/m²
  • 90° Tile Qty: 52 tiles/m²
  • Tiles per Pallet: 768
  • 35° – 89° Cover per Pallet: 12.8 m²
  • 90° Cover per Pallet: 14.7 m²

By utilizing this information and following the calculation method described earlier, you can determine the precise quantity of Redland tiles necessary for your project.


Accurately calculating the number of roof tiles required is crucial for the success of your roofing project. By considering factors such as tile size and headlap, measuring your roof area meticulously, and utilizing manufacturer specifications, you can confidently order the right quantity of tiles. At First Class Roofing, we understand the significance of these calculations and the impact they have on your project’s timeline and budget. With our comprehensive guide, you are equipped with the knowledge to make informed decisions and ensure a successful roofing endeavor.

Remember, at First Class Roofing, we are dedicated to providing high-quality products and exceptional service. If you have any questions or require further assistance in determining your tile requirements, please don’t hesitate to reach out to our knowledgeable team. We are here to help you every step of the way.

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