How to use this fertilizer calculator
Calculate fertilizer product pounds and bags from lawn area, desired nitrogen rate, and bag analysis.
Formula
Required nutrient = area ÷ 1,000 × desired lb N. Product pounds = required nutrient ÷ nitrogen decimal. Multiply by applications and allowance, then round bags up.Worked example
Example: For 5,000 sq ft at 0.75 lb N per 1,000, one application needs 3.75 lb of nitrogen. A 24% nitrogen product requires about 15.6 lb of fertilizer before overlap.
Accuracy and limitations
Use soil-test and label guidance. This calculator performs quantity math; it does not determine whether a nutrient application is agronomically or legally appropriate.