Lawn Fertilizer Calculator
How many pounds of product your lawn needs.
Enter your values
Results update instantly as you type — no submit needed.
Results
- Fertiliser needed
- 20.83 lb
- Per 1,000 sq ft
- 4.17 lb
- Nitrogen applied
- 5 lb
- 50 lb bags needed
- 0.42
Quick answer
Pounds of product = target lb of nitrogen per 1,000 sq ft × lawn area ÷ 1,000 ÷ the nitrogen percentage.
lb product = (N rate × area ÷ 1000) ÷ (N% ÷ 100)
How to use the Lawn Fertilizer Calculator
- 1Measure your lawn area in square feet.
- 2Read the first number of the NPK analysis on the bag.
- 3Set your target nitrogen rate.
Frequently asked questions
What is a typical nitrogen rate?
1 lb of nitrogen per 1,000 sq ft per application, with 3–4 lb total per year for cool-season grass.
What do the three NPK numbers mean?
Percentages by weight of nitrogen, phosphorus and potassium — 24-0-6 means 24% nitrogen and no phosphorus.