Fertilizer for a lawn
Enter area, target nitrogen rate and the first number on the bag.
sq ft
lb N/1000
%
m²
g N/m²
%
Fertilizer
-lb
pounds = (area ÷ 1000 × N rate) ÷ (N% ÷ 100)
Fertilizer
-kg
kilograms = (area × N rate ÷ 1000) ÷ (N% ÷ 100)
Estimate only. Confirm the final quantity with your supplier before ordering.
How the fertilizer estimate works
Lawn fertilizer is dosed by nitrogen. Pick a target nitrogen rate, often about 1 pound of nitrogen per 1000 square feet per feeding, then divide by the nitrogen fraction of your product, which is the first number in the N P K figures on the bag. A 20 percent nitrogen product needs five times its nitrogen weight in product. Do not exceed the label rate.
Feeding the lawn? A broadcast spreader applies fertilizer evenly and to a set rate, avoiding stripes and burn.
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Common questions
How much fertilizer for 1000 square feet?
To apply 1 pound of nitrogen with a 20 percent nitrogen product, you need 5 pounds of product per 1000 square feet.
What does the N percentage mean?
It is the first number in the N P K figures on the bag, the share of the product that is nitrogen. Lower nitrogen means you apply more product for the same nitrogen rate.
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