Fertilizer Calculator (NPK) – Nutrients per Acre
Free NPK fertilizer calculator. Calculate nitrogen, phosphorus, and potassium requirements for major crops based on your yield goal.
This free calculator is part of CropBuddy's open farm-tools suite. Use it directly in your browser — no signup, no email, no download. Results update instantly as you change inputs, and you can save your numbers to a free CropBuddy account to track them across the season.
About this calculator
Free NPK fertilizer calculator. Calculate nitrogen, phosphorus, and potassium requirements for major crops based on your yield goal. Built for owner-operators of mid-size farms who need quick answers in the field without opening a spreadsheet. Pair it with CropBuddy's field mapping, task scheduling, and harvest tracking for a complete farm management workflow.
More farming tools: Acreage, Planting dates, NPK fertilizer, Harvest yield, Irrigation, Seed rate, Grain market.