Fertilizer Calculator is a comprehensive, professional-grade fertilizer calculator web application that helps farmers, gardeners, and agricultural professionals calculate various fertilizer-related metrics.

Pension Calculator

Modern Fertilizer Calculator

Professional-grade fertilizer calculations for optimal plant nutrition

The calculator features:

1. 1. Multiple Calculation Tools:
   • NPK Calculator
   • Soil Test Calculator
   • Fertilizer Blend Calculator
   • Application Rate Calculator
   • Unit Converter
2. 2. Modern UI Features:
   • Dark/light mode toggle
   • Responsive design that works on all devices
   • Tab-based navigation between different calculators
   • Clean, intuitive interface with visual feedback
3. 3. Technical Implementation:
   • Built with HTML, CSS (Tailwind CSS), and vanilla JavaScript
   • No external dependencies beyond Tailwind and Font Awesome
   • Persistent theme preference using localStorage
   • Client-side calculations for immediate results

How to Use the Fertilizer Calculator

General Navigation

1. Use the tabs at the top to switch between different calculator tools
2. Toggle between dark/light mode using the moon/sun icon in the header
3. Fill in the required fields (marked with placeholders)
4. Click the calculate button to see results
5. Results appear in a highlighted card below the input fields

NPK Calculator

Purpose: Calculate fertilizer requirements based on NPK analysis and application rate.

1. Enter the fertilizer’s NPK percentages (N, P, K)
2. Specify your desired nitrogen application rate (lbs N per 1000 sq ft)
3. Enter the area to be fertilized (square feet)
4. Optionally enter bag weight for bag quantity calculation
5. Click “Calculate” to see:
   • Total fertilizer needed
   • Application rate
   • Number of bags required (if bag weight provided)
   • Nutrient application amounts

Soil Test Calculator

Purpose: Determine fertilizer needs based on soil test recommendations.

1. Enter recommended nutrient levels from your soil test (N, P₂O₅, K₂O)
2. Specify the total area to be fertilized
3. Enter the NPK analysis of your available fertilizer
4. Click “Calculate” to see:
   • Total fertilizer needed
   • Application rate
   • Any nutrient deficits that may require additional fertilizer

Fertilizer Blend Calculator

Purpose: Calculate the resulting NPK analysis when blending two fertilizers.

1. Enter NPK percentages and weight for Fertilizer A
2. Enter NPK percentages and weight for Fertilizer B
3. Click “Calculate Blend” to see:
   • Blend composition percentages
   • Resulting NPK analysis
   • NPK ratio of the final blend

Application Rate Calculator

Purpose: Determine fertilizer needs for different area shapes.

1. Select the area shape (square, circle, or triangle)
2. Enter the required dimensions for your selected shape
3. Specify the desired fertilizer application rate
4. Optionally enter bag weight for bag quantity calculation
5. Click “Calculate” to see:
   • Total area calculation
   • Fertilizer quantity needed
   • Number of bags required (if bag weight provided)

Unit Converter

Purpose: Convert between different area and weight units.

1. Area Conversion:
   • Select “from” and “to” units
   • Enter the value to convert
   • Click “Convert Area”
2. Weight Conversion:
   • Select “from” and “to” units
   • Enter the value to convert
   • Click “Convert Weight”

Key Features

• Responsive Design: Works on desktop, tablet, and mobile devices
• Persistent Settings: Remembers your theme preference between visits
• Instant Calculations: Results appear immediately without page reload
• Visual Feedback: Clear highlighting of results and error states
• Professional Formulas: Uses accurate agricultural calculation methods

This calculator is ideal for anyone needing precise fertilizer calculations for lawns, gardens, or agricultural fields, helping to optimize plant nutrition while avoiding over-application.