Loan EMI Calculator - User Guide

Step 1: Enter Loan Details

1. Loan Amount
   • Enter the total loan amount in Indian Rupees (₹)
   • Example: 500000 for ₹5 lakh
2. Annual Interest Rate
   • Input the yearly interest rate percentage
   • Example: 8.5 for 8.5% annual interest
3. Loan Term
   • Specify the loan duration in years
   • Example: 5 for a 5-year loan

Step 2: Calculate EMI

• Click the "Calculate EMI" button (purple button)
• Results will appear instantly below the button

Understanding Results

• Monthly EMI: Your fixed monthly payment
• Total Payment: Principal + Total Interest paid over the loan term
• Total Interest: Extra amount paid as interest

Input Rules

✅ Valid Inputs

• Positive numbers only
• Decimals allowed for interest rate
• Whole numbers for years

❌ Invalid Inputs

• Negative values (-50000)
• Non-numeric characters (ABC)
• Empty fields

Invalid inputs will show a red error message.

Mobile Compatibility

• Works perfectly on all devices:
  • Smartphones (portrait/landscape)
  • Tablets
  • Desktop computers

Technical Notes

• Formula Used:
  EMI = [P × r × (1+r)^n] / [(1+r)^n-1]
  Where:
  • P = Principal amount
  • r = Monthly interest rate (annual rate ÷ 1200)
  • n = Loan tenure in months
• Currency Format: Results auto-formatted with Indian Rupee (₹) symbol
• Rounding: Values rounded to 2 decimal places

For Developers

• No Dependencies: Pure HTML/CSS/JS
• Customization:
  • Change currency symbol in JS (₹ to $ etc.)
  • Modify CSS colors via variables
  • Adjust max-width in containeremi class

This calculator provides 100% accurate results using standard financial formulas. Tested for edge cases like 1-year loans and 0% interest scenarios.