NPK Ratio Calculator

Calculate NPK ratios and blend fertilizers to meet nutrient requirements.

Target Nutrients (lbs/acre)

Nitrogen (N)

Phosphorus (P2O5)

Potassium (K2O)

Fertilizer Source 1

N %

P2O5 %

K2O %

Fertilizer Source 2

N %

P2O5 %

K2O %

Fertilizer Source 3 (optional)

N %

P2O5 %

K2O %

Common NPK Ratios by Crop

Crop	N	P2O5	K2O
Corn (high yield)	180-200	60-80	80-120
Soybeans	0-20	40-60	60-80
Wheat	100-140	30-50	30-50
Cotton	80-120	40-60	60-80