Calculate nitrogen, phosphate, and potash applied from fertilizer N-P-K analysis. Use this NPK calculator to estimate nutrient pounds per acre, total nutrients, fertilizer product needed, fertilizer cost, and cost per acre.
Nutrients applied:
Enter fertilizer analysis and product rate to calculate pounds of N, P₂O₅, and K₂O applied per acre.
Product needed from target:
Choose a target nutrient and rate to estimate how much fertilizer product is needed per acre.
Total nutrients for field:
The calculator multiplies per-acre nutrient rates by field acres.
NPK fertilizer cost:
Enter fertilizer cost per ton and application cost per acre to estimate total cost and cost per acre.
An NPK calculator helps estimate how much nitrogen, phosphate, and potash are applied from a fertilizer product or blend.
It can help compare fertilizer analysis, product rates, target nutrients, total tons, nutrient cost, application cost, and field totals.
Your result shows estimated N, P₂O₅, and K₂O applied per acre, total nutrients applied, fertilizer product needed, total product pounds, product tons, fertilizer cost, application cost, and total cost. These are estimates based on the values you enter.
NPK stands for nitrogen, phosphate, and potash. Fertilizer labels show these as percentages, usually written as N-P-K, such as 10-10-10 or 46-0-0.
Multiply the fertilizer product rate by each nutrient percentage. For example, 200 pounds of 10-10-10 applies 20 pounds of N, 20 pounds of P₂O₅, and 20 pounds of K₂O per acre.
Divide the target nutrient rate by the nutrient percentage in the fertilizer. For example, 100 pounds of N divided by 46% nitrogen equals about 217 pounds of urea per acre.
Yes. Enter fertilizer cost per ton and application cost per acre to estimate fertilizer cost, application cost, total cost, and cost per acre.