Use this calculator to …

Convert fertilizer recommendations between pounds per acre and pounds per square feet.

List alternative recommendations when fertilizer grades are not available.

Get recommendations based on the specific area to be fertilized.

Calculate fertilizer cost.

Fertilizer Calculator
R. Hitchcock and D. E. Kissel

The University of Georgia Fertilizer Calculator was developed to assist users whose fertilizer needs require adjustment from the standard soil test recommendation due to a change in units, availability of fertilizer products, and/or a difference in land size. With it, the user can calculate the weight of fertilizer materials to supply the amounts of N, P2O5, and K2O recommended by a soil test report. Users have the option to select recommendations in pounds per acre that are typical of agronomic crop recommendations or in pounds per 1000 square feet that are typical of homeowners reports such as for a home lawn. The calculator also allows the user to select fertilizer grades different from those given in the recommendation. This is useful when the fertilizer grades in the test report are not available locally. The calculator ranks the various fertilizer combinations, with the best getting the highest score. The calculator also has a section that allows the user to calculate the area of a garden or lawn given the dimensions and shape of the area to be fertilized. Fertilizer costs can also be calculated.

Step 1. Enter fertilizer requirements Step 2. Select available grades Step 3. Choose application rate and area
Fertilizer recommendations are given in:

Recommendation from
soil test report
pounds per acre
Choose from the list of commonly-available grades,
or add your own in N-P2O5-K2O format.
Cost per pound
If the area is unknown, what shape best describes the area to be fertilized?


Number of grades to use in recommendation:

Round recommendations to nearest: