Lawn Watering Rate Calculator

The Pennington Seed watering calculator uses some statistics about your location, real time weather and a couple pieces of information from you to calculate the best watering plan for your lawn.

Proper watering is one of the most important factors in making a lawn beautiful. Fill out the inputs below to determine how long to water and get the best out of your lawn.

To Get Started: Enter your ZIP code in the search bar below.

Monthly Evapotranspiration (inches)

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Leaflet | CartoDB attribution

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Leaflet | © CARTO

We have calculated the weekly evapotranspiration at your selected location to be 1.20 inches per week.

What type of grass are you watering?

How can I tell what type of grass I have?

Take a look at the packaging’s seed tag and refer to this article for how to interpret. Choose the most prevalent kind of grass in the mix for the calculator. Don’t have the bag anymore? If your lawn goes brown or dormant during winter months, choose Warm Season; otherwise choose Cool Season.

How green do you want your lawn to be?

How much rain did you get last week? (total inches)

We have calculated total rainfall for the last 7 days at your selected location to beinches. You can adjust this value to meet your specific effective rainfall estimate.

How much water does your irrigation system put out? (inches per hour)

How can I find out my water output?

1.22in/hr is a rough average rate across sprinkler system types and brands. For best results, enter the actual amount your system uses by visiting the manufacturer’s website or by placing multiple tuna or cat food cans on the lawn (both are about an inch high). Run your sprinkler or irrigation systems for 15 minutes and measure the water in the catch basins.

How many times a week do you run your irrigation system?

RESULT: Water for 19 Minutes Per Irrigation

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