University of Florida

Calculating Fertilizer for Your Lawn

Applying too much fertilizer can harm your lawn and the environment. So how do you calculate the right amount to apply?

First, you need to know how many square feet your lawn covers. Measure it yourself or take a look at your property survey.

Next, what type of grass do you have and where do you live in the state? Different grasses have different fertility needs depending on where they’re growing.

Finally, what type of fertilizer do you plan to use? Look for the three numbers on the bag and write down how much of the nitrogen is in slow-release form.

Once you’re armed with this information, contact the folks at your county Extension office. They can help you calculate how much fertilizer to apply and tell you when you should apply it.

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