Fertilizer Calculator

• Free online fertilizer calculator
• Calculate the exact fertilizer amount based on crop type, planting area, and fertilizer nutrient content
• Supports preset recommendations for multiple crops, common fertilizer types, and custom N-P-K ratios for scientific fertilization

1. Open the tool page — no installation required
2. Enter the planting area (toggle between mu and hectares), pick a crop, and confirm the N, P, K recommended rates. Click "Add Fertilizer" to choose a fertilizer (you can add several)
3. Results update automatically as you change inputs. Check the Calculation Results for each fertilizer's amount and nutrient coverage, and use "Reset All" to restore defaults

• This tool is completely free and requires no sign-up
• Everything runs locally in your browser — your data never leaves your device

Free online fertilizer calculator. Calculate precise fertilizer amounts based on crop type, planting area, and fertilizer nutrient content. Supports multiple crop presets, common fertilizer types, and custom N-P-K ratios for scientific fertilization.

Open the tool page — no installation required Enter the planting area (toggle between mu and hectares), pick a crop, and confirm the N, P, K recommended rates. Click "Add Fertilizer" to choose a fertilizer (you can add several) Results update automatically as you change inputs. Check the Calculation Results for each fertilizer's amount and nutrient coverage, and use "Reset All" to restore defaults

This tool is completely free and requires no sign-up Everything runs locally in your browser — your data never leaves your device

Yes, Fertilizer Calculator is completely free. No download or installation required — it runs right in your browser.