How to Calculate the Area of a Yard

It is important to know the size of your lawn when making improvements.
It is important to know the size of your lawn when making improvements. (Image: Jupiterimages/BananaStock/Getty Images)

The area of a space is equal to the length of the area multiplied by the width of the area. When performing tasks around your lawn such as re-sodding or installing an irrigation system, it is important to know the area of the lawn that must be covered. Once the area is known, accurate estimates can be generated for the cost of related improvements.

Things You'll Need

  • Tape measure
  • Pencil
  • Paper
  • Calculator

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Divide the lawn into different sections for easy calculation. Whenever possible, ensure that the sections are square or rectangular.

Measure the length and width of each section.

Multiply each section's length by its width to determine the area. For example, if a section of your yard is 15 feet long by 30 feet wide, the area of the section is 450 square feet.

Determine the area of circular sections of your lawn by finding the radius. To find the radius, measure the distance of the area across the center of the circle and divide by two. Multiply the radius by pi, or 3.14, to determine the area. For example, if the circular section has a radius of approximately five feet, multiply five by 3.14 to determine the area, which is 15.7 square feet.

Add the total area of each section together to determine the entire area of the yard.

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