Calculate fertilizer amount
Enter your lawn size, target rate, and bag analysis.
The core fertilizer formula
Purdue Turfgrass explains the basic two-step math: divide the desired pounds of nutrient per 1,000 square feet by the nutrient percentage, then multiply by the treated area. For example, a 0.75 lb nitrogen target with a 16% nitrogen product needs 0.75 ÷ 0.16 = 4.69 lb of product per 1,000 square feet.
Why a calculator beats guessing
- It separates actual nitrogen from product weight.
- It scales the rate to your real lawn square footage.
- It helps avoid accidental over-application when switching products.
- It creates a log so you know what was applied and when.
Use Lawn Dominator
Use Lawn Dominator to calculate treatment amounts, save the product, log the date and rate, and compare results with photos over the season.