Fertilizer Calculator

Your details

Total area you want to fertilize.
sq ft
First number of the NPK grade (e.g. 29 in 29-0-4). This is % nitrogen by weight.
%
Second number of the NPK grade. Reported as % phosphate (P₂O₅) by weight.
%
Third number of the NPK grade. Reported as % potash (K₂O) by weight.
%
How much nitrogen you want to deliver per unit area. Turf grasses typically need 0.5-1.5 lb N per 1,000 sq ft per application.
lb N / 1,000 sq ft
Weight of one fertilizer bag. Used to calculate how many bags to buy.
lb
Leave at 0 to skip cost calculation.
USD
Product rate per 1,000 sq ftModerate application
3.45

How much fertilizer to spread per 1,000 sq ft (or per 100 m² in metric)

Total product needed17.24
Bags to buy1
Total nitrogen (N) delivered5
Total phosphorus (P₂O₅) delivered0
Total potassium (K₂O) delivered0.69

Apply 3.45 lb of product per 1,000 sq ft.

  • Spread 3.45 lb of fertilizer per 1,000 sq ft to deliver 1 lb of nitrogen.
  • You need 17.2 lb of product for your entire area.
  • That rounds up to 1 bag based on the bag weight you entered.

Next stepAlways water in granular fertilizer after spreading to move nutrients into the soil and reduce volatilization.

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