Lawn Fertilizer Calculator
Calculate how much lawn fertilizer to buy and apply based on your lawn size and target nitrogen rate.
How It Works
Enter your lawn area, desired nitrogen application rate (1 lb per 1000 sq ft is typical for most grasses), and your fertilizer nitrogen percentage. The calculator tells you exactly how much to buy and apply.
Formula
Fertilizer (lbs) = Lawn Area (sq ft) x N Rate / 1000 / (N% / 100)
Frequently Asked Questions
How often should I fertilize my lawn?
Cool-season grasses (fescue, bluegrass) need fertilization in fall and spring. Warm-season grasses (bermuda, zoysia) need fertilization in late spring through summer.
What nitrogen rate is safe for lawns?
A safe maximum is 1 lb of actual nitrogen per 1000 sq ft per application. Exceeding this can burn grass and contribute to nutrient runoff into waterways.