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How to Calculate How Many Sprinklers I Need

By Natalie Schwab ; Updated September 21, 2017
Install sprinklers to keep your lawn lush.

Installing your own sprinkler system is cost effective and fairly simple, but you first have to know how many sprinklers you need for your yard. You can waste money and even kill your lawn by installing more sprinklers than you need. Measure your yard and determine how many sprinklers you need to keep your lawn lush and healthy.

Measure Your Yard

Use a measuring tape to measure the outside edges of your yard.

Draw the area of your lawn on a piece of graphing paper.

Use simple conversions, like 1 square equals 1 square foot of yard. If your yard is bigger, you can use 1 square equals 5 or 10 square feet of yard.

Placement of Sprinklers

Look on the label of your sprinkler head to determine what its radius is. Purchasing one that has a 15 foot radius will make calculating easy.

Use your graph paper to determine where your sprinklers will go.

Lay them out 15 feet apart, if you are using sprinklers with a 15 foot radius. If you are using a sprinkler with a 12 foot radius, place them 12 feet apart.

Look over the graph of your yard to make sure every area of lawn will be covered by your sprinklers.

Count how many sprinklers you have placed on your graph and purchase that many.


Things You Will Need

  • Measuring tape
  • Graph paper

About the Author


Natalie Schwab is a professional writer with a bachelor's degree in journalism and business from the University of Arizona. She has copy edited for her university newspaper, the "Arizona Daily Wildcat," conducted legislative research as an intern at Project Vote Smart and reported on the environment for the "Tombstone Epitaph."