How to Calculate Pavers for a Half Circle

Pavers are a popular material for building patios, walkways and driveways. Pavers may be made of concrete, brick or stone, so they are durable and suitable for outdoor use. Pavers come in a wide range of sizes, shapes and colors. Many pavers are manufactured with interlocking edges to make installation easy. In fact, pavers may be “loose-laid,” meaning they can be installed without the use of mortar on a bed of sand and gravel. Of course, before you start building your paver surface, it’s wise to calculate how many pavers you need for your project.

Tape measure

Instructions

- 1
  Calculate how many pavers there are to a square foot. First, multiply the length of one paver in inches by its width in inches to find the square inches. Divide the square inches into 144 (the number of square inches in one square foot) to determine the number of pavers needed to cover one square foot. For example, if a paver is 4 inches by 8 inches, you have 32 square inches. Divided into 144 square inches, this comes out to 4.5 pavers per square foot.
- 2
  Use a tape measure to find the length of the straight side of your planned half-circle patio or other paved area. Divide by 2 to find the radius of a circle with a diameter equal to the length of the straight side. For instance, if the straight side is 15 feet long, the radius is 7 1/2 feet.
- 3
  Square the radius of the circle and multiply by 3.14 to find the area of the circle and then divide by 2 to find the area of a half-circle. Using the example from Step 2, you have 7.5^2 * 3.14/2 = 88.3125 square feet (the “^2” symbol means to square the preceding number). In this example, you have about 88.3 square feet.
- 4
  Multiply the area in square feet by the number of pavers required to cover a square foot. Continuing the example, you would multiply 88.3 square feet by 4.5 pavers for a total of 401.8 pavers. Round off to the nearest whole number, which gives you 402 pavers. Add about 10 percent (40 pavers) to allow for breakage, giving you a total of 442 pavers needed in this example.

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