Enter the area to be covered and the size of each slate into the calculator to determine the number of slates needed for coverage. This calculator helps in estimating the quantity of slates required for roofing or flooring projects.

Slate Coverage Formula

The following formula is used to calculate the number of slates needed for coverage.

C = A / S

Variables:

  • C is the coverage or the number of slates needed
  • A is the area to be covered (square feet)
  • S is the size of each slate (square feet)

To calculate the number of slates needed, divide the area to be covered by the size of each slate. Since you cannot have a fraction of a slate, always round up to the nearest whole number.

What is Slate Coverage?

Slate coverage refers to the number of slate tiles required to cover a specific area, such as a roof or floor. It is important to accurately calculate the number of slates to ensure that there are enough materials for the project without significant waste. Factors such as the overlap of slates and the need for cutting slates to fit irregular spaces can affect the actual number of slates needed.

How to Calculate Slate Coverage?

The following steps outline how to calculate the Slate Coverage.


  1. First, measure the area to be covered (A) in square feet.
  2. Next, determine the size of each slate (S) in square feet.
  3. Use the formula from above = C = A / S.
  4. Finally, calculate the Coverage (C), which is the number of slates needed. Round up to the nearest whole number.
  5. After inserting the variables and calculating the result, check your answer with the calculator above.

Example Problem : 

Use the following variables as an example problem to test your knowledge.

Area to be covered (A) = 100 square feet

Size of each slate (S) = 0.5 square feet