The Best Flowers for Wet Soil

Turn a wet, poorly drained spot in your yard into a colorful landscape feature with these perennial flowers and ornamental grasses.

View Slideshow

Fall Veggies to Plant Now

Grow these cool-season vegetables and herbs to extend your garden's harvests in spring and fall. This list of vegetables includes seasonal vegetables, green vegetables, non-starchy vegetables, winter vegetables, green leafy vegetables, fall vegetables and more.

View Slideshow

Improve Poor Drainage

Follow these tips to transform a poorly drained area into an easy-care garden.

See More

Tips and Tricks to Keep Plants Blooming

Deadheading is a popular practice ¿ but do you know all the ways to keep flowers on your plants longer? Follow these easy tips for keeping your favorite shrubs and flowers blooming longer.

View Video

Top Plant Picks for Late-Summer Color

Keep the color coming on strong through the end of the growing season with these easy-care, reliable annuals and perennials.

View Slideshow

Plan for a Gorgeous Fall Landscape

See how two great gardeners -- one on the East Coast and one on the West -- created knock-your-socks-off fall yards -- and learn how you can do the same.

View Slideshow

Best Plants for Rock Gardens

Transforming an unsightly slope or mound in your backyard into a colorful rock garden is easy when you chose the right plants. These amazing, low-maintenance ground huggers don't mind poor soil but do need good drainage to survive. Here's a list of our top plants for rock gardens.

View Slideshow
Popular in Gardening

Lawn Fertilizer Calculator

Eliminate the guesswork with this handy calculator.

Lawn grass fertilizers are primarily nitrogen plus smaller amounts phosphorous and potassium. The three numbers found on each fertilizer package (for example 30-2-3) indicates the percentage of each of these key nutrients. The first number (usually 25 to 35) indicates the percentage of nitrogen. Use the calculator below to see how many pounds of fertilizer you need to apply each year to keep your lawn healthy. In most cases, you would apply one-half to one-third of this amount in each of two or three well-spaced applications during the growing season.

Lawn fertilizer calculator

Enter the requested information below, then click Calculate to see the range of amounts of fertilizer you need annually. Remember, too much fertilizer is just as damaging as too little.

Square feet to be fertilized
Percent nitrogen in the fertilizer
Type of grass (check one)
Kentucky Bluegrass, Ryegrass
St. Augustine
Pounds of fertilizer needed per year:

Please note: For your convenience, this calculation has been rounded up slightly.

Important reminder: Every effort has been made to ensure the accuracy of this calculation. But before purchasing materials for any project, please check amounts with your suppliers or contractors.

Helpful Tips

  • Bags of fertilizer always provide a recommended application rate. This calculator will also provide the details you need.
  • Most lawns need regular feeding -- once or twice a year -- if they are to be lush and healthy. Feed cool-season grass (grass that generally stays green all year and grows primarily in the South) in the spring and autumn; feed warm-season grass (the Northern grasses that go dormant in the fall and winter) in the spring and summer.
  • Apply fertilizer with a spreader, for even distribution. A lawn's greatest need is for nitrogen, so the amount of fertilizer you need will depend on the nitrogen content of the fertilizer.

Loading... Please wait...