Figuring fertilizer ratios - measuring lawn
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Ratios for Smarter Fertilizing

Fertilizer ratios and grades tell consumers how many pounds of nutrients are contained in 100 pounds of fertilizer and indicate the relative amounts of nitrogen (N), phosphorus (P), and potassium (K).

To figure out home much fertilizer (or any other soil amendments) to buy, divide your lawn into simple geometric shapes, and then calculate the areas of the shapes using simple formulas.

Formulas for Calculating Areas

Rectangle or Square:
Side A x Side B

Right Triangle:
1/2 x Side A x Side B

Circle:
3.14 x Radius x Radius

Example Lawn Area:

40′ x 30′=1,200 sq. ft.
1/2 x 26′ x 15′=195 sq. ft.
9′ x 46′=414 sq. ft.
30′ x 35′=1,050 sq. ft.
21′ x 22′=462 sq. ft.
23′ x 17′=391 sq. ft.
9′ x 70′=630 sq. ft.

Total=4,342 sq. ft.

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