EMI Explained: How Monthly Loan Payments Are Calculated

EMI (Equated Monthly Installment) is the fixed amount you pay each month to repay a loan over a specified period. Understanding how EMI is calculated helps you compare loan offers and plan your finances.

The standard EMI formula uses the reducing-balance method. Each month, interest is calculated on the remaining principal (not the original loan amount), and the rest of your payment goes toward reducing the principal. The formula is:

EMI = P × r × (1 + r)^n / ((1 + r)^n − 1)

Where P is the principal (loan amount), r is the monthly interest rate (annual rate ÷ 12 ÷ 100), and n is the number of monthly payments.

How payments break down: In the first month, most of your EMI goes toward interest because the outstanding principal is highest. As you pay down the principal over time, the interest portion decreases and the principal portion increases. By the final months, nearly all of your EMI goes toward principal.

Example: A ₹5,00,000 loan at 10% annual interest for 36 months results in an EMI of approximately ₹16,134. In month 1, ₹4,167 goes to interest and ₹11,967 to principal. By month 36, only ₹133 goes to interest and ₹16,001 to principal.

This is why prepaying early in the loan tenure saves the most interest — you reduce the principal when it's largest, cutting off months of future interest accrual. Use Tooler's EMI Calculator to model different loan scenarios before committing.