N-P-K Fertilizer Calculator – Pounds per Acre & Urea Rate
Estimate crop nutrient removal in pounds per acre from crop, yield goal, and acres. Convert nitrogen needs to a selected fertilizer product rate. Use soil tests and local guidance before applying.
What this N-P-K calculator estimates
Choose a crop, enter a yield goal and acres, and the calculator estimates crop nutrient removal as nitrogen, P₂O₅, and K₂O in pounds per acre and across the entered acreage. It also converts the nitrogen estimate to the selected nitrogen-containing fertilizer product.
Use it as a planning starting point
The output is a crop-removal estimate, not a field-specific fertilizer recommendation. It does not adjust for soil-test levels, manure, cover crops, irrigation water, residual nutrients, nutrient-loss risk, or local regulations. Review a current soil test, product label, and local agronomic guidance before buying or applying fertilizer.
Turn the result into organized field work
The calculator is free and requires no account. CropBuddy's optional farm workspace helps a crew keep field records, tasks, stock, and completed activity together.
More farming tools: Acreage, Acres per hour, Seed rate, Harvest yield, and Irrigation.