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How to Calculate Grass Seed for Overseeding

By Elizabeth Knoll ; Updated September 21, 2017

A lush, green lawn begins with proper care practices. Regular mowing, ample watering, and a good fertilizing schedule are all ways to have a successful lawn. One other practice that is equally important is periodic overseeding of the lawn. As grass plants age and mature, a few of them will inevitably die out. Overseeding will allow new grass plants to take hold in these areas and keep your lawn looking thick and lush. However, to overseed successfully you need to calculate the right amount of grass seed for overseeding.

Calculate the square footage of the area you need to overseed. Measure the length and width of the area and multiply them together. So if you measure 50 feet by 30 feet, your square footage is 1,500 square feet.

Refer to the grass seed packaging for the overseeding rate. Most grass seed should be applied at the rate of 2 to 4 lbs. per 1,000 square feet.

Calculate the amount of grass seed you need to apply to the lawn. Take your overseeding rate and divide it by 1,000. Multiply that number by your square footage that you calculated. For example if your overseeding rate is 4 lbs. per 1,000 square feet, you would divide that by 1,000, and then multiply by your square footage (1,500 from step 1 example). This would yield 6 lbs. of grass seed needed to overseed.


Things You Will Need

  • Tape measure
  • Calculator