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Lawn Fertilizer N-P-K Application Rate Calculator

Product lbs = (target N rate / %N) × area.

Calculates how many pounds of fertilizer product to apply per 1,000 ft² from the target nitrogen rate and the N percentage on the bag label.

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Marcus Laurent By Marcus Laurent
Published Last reviewed 1 min read

Inputs

Results

Enter values and click Calculate to see results.
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How to use this calculator

  1. Fill in the inputs above using the units you already have.
  2. Values update automatically as you type — no submit button needed.
  3. Hover any result row for the underlying formula and intermediate values.

Formula

Product (lbs/1000 ft²) = target_N_lbs / (N% / 100)

In depth

Calculates how many pounds of fertilizer product to apply per 1,000 ft² from the target nitrogen rate and the N percentage on the bag label.