Fertilizer rate calculator (NPK)
PROPounds of fertilizer to apply your target N rate.
Inputs
Result
Fertilizer per 1,000 sq ft
4.76 lb
Total fertilizer
4.8 lb
50 lb bags
1
The formula
lb fertilizer per 1,000 sq ft = target N ÷ (%N ÷ 100).
Worked example
21-0-0 to deliver 1 lb N/K: 1 ÷ 0.21 = 4.76 lb per 1,000 sq ft.
Frequently asked
›Typical N target?
0.5–1.0 lb N per 1,000 sq ft per feeding on lawns.