Enter the rate of desired nutrient (pounds of nutrient) and the percentage of nutrient in the fertilizer into the Fertilizer Rate Calculator. The calculator will evaluate the Fertilizer Rate.

## Fertilizer Rate Formula

The following two example problems outline the steps and information needed to calculate the Fertilizer Rate.

FR = RN / (PN/100)
• Where FR is the Fertilizer Rate (lbs of fertilizer)
• RN is the rate of desired nutrient (pounds of nutrient)
• PN is the percentage of nutrient in the fertilizer

## How to Calculate Fertilizer Rate?

The following example problems outline how to calculate Fertilizer Rate.

Example Problem #1:

1. First, determine the rate of desired nutrient (pounds of nutrient).
• The rate of desired nutrient (pounds of nutrient) is given as: 50.
2. Next, determine the percentage of nutrient in the fertilizer.
• The percentage of nutrient in the fertilizer is provided as: 60.
3. Finally, calculate the Fertilizer Rate using the equation above:

FR = RN / (PN/100)

The values provided above are inserted into the equation below and computed.

FR = 50 / (60/100) = 83.33 (lbs of fertilizer)

Example Problem #2:

For this problem, the variables required are provided below:

rate of desired nutrient (pounds of nutrient) = 70

percentage of nutrient in the fertilizer = 75