Estimate Nitrogen Needs for Your Vegetable Garden

This website takes 3 types of data inputs and converts them into an estimate of how much nitrogen-based fertilizer is needed.

Input 1: Nitrogen (lb) per Acre

This calculator asks for the nitrogen needs for a crop planted in an acre because this value can often be found at the website of a county extension office or the land grant university in your state. Nitrogen (lb.) per acre:

Input 2: Length and Width of Your Plot

Plot length (ft.):
Plot width (ft.):

Input 3: Percentage of Nitrogen in your Fertilizer

Fertilizer purchased in a garden store will have a 3 number code on it. An example would be "12-3-7". This means the contents of the fertilizer package have 12 percent nitrogen, 3 percent phosphorus, and 7 percent potassium (potash). These are the three primary nutrients a plant will need. Enter the first of these numbers in the next field. Percentage of N in the fertilizer:

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