How to Calculate the Square Feet of a Round Pool

Determining the square feet of a circular pool is the same as determining the area of a circle. Calculate the area of a pool so you'll know how much land a round pool will take up on your property. The formula for calculating the area of a circle is pi times radius squared.

Things You'll Need

  • Tape measure
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Instructions

    • 1

      Measure from one side of the pool through its center to the opposite side with the tape measure. This number is the pool's diameter. For example, say a pool has a diameter of 10 feet.

    • 2

      Divide the diameter in half to determine the radius. In the example, 10 feet divided by two equals a radius of 5 feet.

    • 3

      Multiply the radius by itself. In the example, 5 feet times 5 feet equals 25 feet squared.

    • 4

      Multiply the number calculated in Step 3 by pi to determine the area of the pool. Pi is generally estimated as 3.14. In the example, 25 feet squared times 3.14 equals an area of 78.5 square feet.