Fertilizer Coverage Calculator & Guide

Applying the right amount of fertilizer can make all the difference in the health and growth of your lawn, garden beds, or vegetable patch. Too little fertilizer won’t give your plants the nutrients they need — but too much can burn roots, waste money, and harm the environment.

To make things easier for our customers, we’ve created a Fertilizer Coverage Calculator you can use right here on our website, https://www.thehomeandgardenstore.com. Just enter the size of your lawn or garden area, and the calculator will tell you exactly how many pounds of fertilizer you need based on the product’s coverage rate.

Whether you’re feeding your lawn in spring, boosting your vegetable garden midsummer, or preparing your flower beds for fall, this tool helps you apply the right amount every time.

How Fertilizer Coverage Works

Every fertilizer bag lists a coverage area — usually something like:

• Covers 5,000 sq ft

• Covers 10,000 sq ft

• Covers 2,500 sq ft (common for organic fertilizers)

Coverage is based on applying the fertilizer at the recommended rate printed on the bag.

To figure out how much you need, you simply:

1. Measure your lawn or garden area (length × width)

2. Enter the total square footage

3. Enter the coverage listed on your fertilizer bag

4. The calculator tells you how many pounds or bags you need

We’ve automated that math for you below.

Fertilizer Coverage Calculator

This calculator:

• Takes the total square footage of the lawn or garden

• Takes the coverage listed on the fertilizer bag

• Calculates how many bags are needed

• Rounds up to the nearest whole bag

Just like your mulch calculator, it runs entirely in the browser.

Tips for Accurate Fertilizer Application

• Measure irregular areas in sections

• Don’t overlap passes with your spreader

• Water lightly after applying granular fertilizer

• Avoid fertilizing before heavy rain

• Follow the exact rate printed on the bag

Proper fertilizing will make all the difference

Ready to Get Started?

Use the calculator above to determine how much fertilizer you need, then stop by The Home & Garden Store in Boise for expert help choosing the right product for your lawn or garden. We have 50+ years of landscape and gardening experience here in the Treasure Valley and Charlie, the general manager is an Idaho Certified Nurseryman.

The Home & Garden Store - Boise, Idaho