Enter the area to be covered and the coverage per shingle into the calculator to determine the shingle coverage. This calculator can also evaluate any of the variables given the others are known.

Shingle Coverage Formula

The following formula is used to calculate the shingle coverage.

SC = (A / S) * O


  • SC is the shingle coverage (number of shingles) A is the area to be covered (square feet) S is the coverage per shingle (square feet) O is the overage factor (percentage)

To calculate the shingle coverage, divide the area to be covered by the coverage per shingle. Then, multiply the result by the overage factor to account for waste and extra shingles for repairs. The result is the total number of shingles needed.

What is a Shingle Coverage?

Shingle coverage refers to the area that a certain quantity of roofing shingles can cover when installed on a roof. It is typically measured in squares, where one square equals 100 square feet. This measurement is crucial in determining the amount of shingles needed for a roofing project, ensuring that there are enough materials to cover the entire roof surface.

How to Calculate Shingle Coverage?

The following steps outline how to calculate the Shingle Coverage.

  1. First, determine the area to be covered (A) in square feet.
  2. Next, determine the coverage per shingle (S) in square feet.
  3. Next, determine the overage factor (O) as a percentage.
  4. Next, use the formula SC = (A / S) * O to calculate the shingle coverage.
  5. Finally, calculate the shingle coverage by inserting the values of A, S, and O into the formula.

Example Problem:

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

Area to be covered (A) = 500 square feet

Coverage per shingle (S) = 25 square feet

Overage factor (O) = 10%