Fertilizer Blend & Rate Calculator
The best free tool to calculate fertilizer rates, blends, and costs. Fast, private, and secure.
📊 Recommendation Report
1. Nutrient Balance
| Nutrient | Calculated Target (kg/ha) | Actual Supplied | Status |
|---|
2. Fertilizer Schedule
| Fertilizer Product | 1st Application (Basal) |
2nd Application (Top Dress) |
Total Rate / Unit | Total Quantity | Cost Estimate |
|---|---|---|---|---|---|
| TOTAL ESTIMATED COST | |||||
Top Fertilizer Calculator & Blending Tool
Welcome to the internet's best, fastest, and lifetime free Fertilizer Calculator. Whether you need to calculate fertilizer rates for a large farm or use a yard fertilizer calculator for your home lawn, our tool handles it all. Your information is 100% confidential and secure because all processing happens right here in your browser.
We help you handle complex blending fertilizer calculations, convert between kg/ha and lbs/acre, and even plan liquid fertilizer applications for maximum spring fertility.
*fertility calculator clear blue* *how do you calculate the total fertility rate* *how to calculate total fertility rate tfr* *how do you calculate total fertility rate* *calculadora de fertilidad según edad*
Why this is the Best Fertilizer Calculator
Precise NPK Planning
Input your soil test results and get exact rates for Urea, DAP, MOP, or custom blends.
Liquid Fertilizer Calculator
Easily adapt the custom blend settings to work with liquid formulations by entering the percentage weight/volume.
Global Reach (Español)
Known globally as a calculadora de fertilidad or días fértiles calculadora for crops, we support diverse agricultural needs.
Cost & Budgeting
Calculate dias fertiles and immediately see the total cost for your specific field size.
Soil Adjustments
Our logic adjusts for sandy, clay, and loamy soils to ensure optimal total fertility rate efficiency.
Private & Secure
No data uploads. Your farm data stays on your device.
Advanced Features: Blending & DIY
Calculating Fertilizer Blends
If you buy pre-mixed sacks or liquid fertilizers, standard calculators often fail. Use our Fertilizer Blend Calculator mode by checking "Use Custom NPK Blend." Enter the N-P-K values from your bag (e.g., 10-10-10 or 19-19-19), and we will tell you exactly how much product is needed to meet your soil's specific nutrient requirement.
DIY Lawn Care & DEF
A popular DIY trend is using Diesel Exhaust Fluid (DEF) as a nitrogen source. We are often asked: "How to mix DEF for lawn fertilizer calculator?" or "How much DEF per gallon of water?". Since DEF is roughly 32.5% Urea (Nitrogen) and water, you can calculate it as a liquid fertilizer. (See FAQ below for mixing details).
Global & Multilingual Utility
Our tool serves farmers and gardeners across the globe, from the USA and UK to India, Australia, and Latin America. We understand that terminology varies:
- English: Fertilizer calculator, NPK calculator, Spring fertility calculator.
- Español: Users looking for calculadora de dias fertiles, periodo fertil calculadora, or calcular periodo fertil in an agricultural context will find our tool adapts to their nutrient planning needs.
- Scientific: We handle conversions for elemental P vs P₂O₅ and K vs K₂O automatically.
Frequently Asked Questions
Is it private and secure?
Yes. Everything runs locally in your browser. Your data never leaves your device, making it 100% confidential.
How to mix DEF for lawn fertilizer?
DEF (Diesel Exhaust Fluid) is ~32% Nitrogen. To use it safely on a lawn, a common ratio is 1 part DEF to 9 parts water (how much def per gallon of water for fertilizer calculator). Always test a small area first to avoid burning the grass.
Can I calculate liquid fertilizer rates?
Yes. Use the "Custom Blend" feature. Enter the N-P-K analysis of your liquid fertilizer calculator product, and the tool will tell you the quantity needed.
Is this useful for 'Spring Fertility'?
Absolutely. Spring is the critical time for nitrogen application. Use our "Spring Fertility Calculator" features to split your nitrogen application between planting and top-dressing.
Elemental P vs P₂O₅? K vs K₂O?
Targets are usually elemental P and K. The tool converts to P₂O₅ (×2.291) and K₂O (×1.205) for fertilizer sources automatically.
Is it really free?
Yes, it is lifetime free and unlimited with no signups or paywalls.
Explore more free calculator tools
Try our other tools: Fertilizer Calculator, Age Calculator, Calorie Calculator, BMI Calculator, Army Body Fat Calculator, BMR, TDEE & Macro Calculator Calculator, Compound Interest Calculator, Loan Calculator, Date Calculator, IP Subnet Calculator, Percentage Calculator, Scientific Calculator.