Garden
Lawn Fertilizer
The math every lawn nerd needs. Plug in your lawn size + the bag's NPK numbers + target nitrogen rate. Get exact pounds to apply.
FAQ
What's NPK? +
The 3 numbers on every bag — Nitrogen, Phosphorus, Potassium. A 32-0-10 bag is 32% N. Most lawn fertilizers focus on N because it drives green growth.
Annual nitrogen for cool season turf? +
2-4 lb N per 1000 sqft per year, applied in 3-4 applications. Warm season (Bermuda, St. Augustine): 3-5 lb/yr. Don't exceed 1 lb per application unless slow-release.
When to fertilize? +
Cool season (KBG, fescue): early fall is the biggest, then late fall. Spring is third priority. Warm season: late spring through summer.