Fertilizer (NPK) Calculator
Stop guessing with your lawn. Calculate exactly how many pounds of fertilizer you need to reach your target nutrient levels.
This covers 5,000 sq ft at 1.0 lb N rate.
What is N-P-K?
I genuinely believe that the "N-P-K" numbers on a fertilizer bag are the most important part of gardening. They represent the percentage (by weight) of Nitrogen, Phosphorus, and Potassium in the bag. A 20-0-10 bag is 20% Nitrogen. If you buy a 50lb bag, only 10lbs of it is actually nitrogen—the rest is filler and other nutrients.
The "Standard" Rate: Most lawn experts recommend applying 1 pound of Nitrogen per 1,000 square feet per application. Applying too much at once can "burn" the grass, and too little won't give you that lush green look.
Nutrient Guide:
- Nitrogen (N): Promotes green, leafy growth (Up).
- Phosphorus (P): Promotes root and flower development (Down).
- Potassium (K): Promotes overall plant health and disease resistance (All around).