The Q&A Archives: Calculating Fertilizer

Question: How do I calculate how much fertilizer my lawn will need?

Answer: Divide rate of nitrogen desired by percent nitrogen in bag (first number of 3 on bag, use decimal form), then multiply answer found by square footage of lawn and divide by 1,000.

EXAMPLE: 15-5-10 fertilizer, 7,000 sq ft, want to apply 1 lb. nitrogen/1,000 sq ft

a. 1 lbs. divided by .15 = 6.66, round to 6.7

b. 6.7 multiplied by 7,000 = 46,900; divided by 1,000 = 46.9, or 47 pounds

Therefore, need about 47 pounds of 15-5-10 fertilizer to cover entire lawn.

« Click to go to the homepage

» Ask a question of your own

Q&A Library Searching Tips

  • When singular and plural spellings differ, as in peony and peonies, try both.
  • Search terms are not case sensitive.

Today's site banner is by Paul2032 and is called "Coreopsis"