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Lawn Fertilizer Calculator

Pounds of fertilizer per application from N rate and bag analysis.

Compute how many pounds of bagged fertilizer to spread on a lawn for a target nitrogen rate (lb of N per 1000 ft²) given the percentage of N in the bag.

Nadia Almasri By Nadia Almasri
Published Last reviewed 1 min read

Inputs

ft²
lb / 1000 ft²
%

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

Bag pounds = (lawn ft² / 1000) × N rate / (N % / 100).

In depth

Compute how many pounds of bagged fertilizer to spread on a lawn for a target nitrogen rate (lb of N per 1000 ft²) given the percentage of N in the bag.