EMI Calculator

What an EMI really is

An Equated Monthly Instalment (EMI) is the fixed sum you pay a lender every month until a loan is repaid. Each payment bundles two things: the interest due on the outstanding balance, and a slice of the principal. Because the amount stays constant, EMIs make an otherwise daunting purchase — a home, a car, a big-ticket expense — manageable and predictable across years.

The EMI is derived from three inputs: the principal (P), the monthly interest rate (r), and the number of instalments (n). The standard formula is EMI = P × r × (1 + r)ⁿ / ((1 + r)ⁿ − 1). You don't need to compute it by hand — the calculator does — but understanding the drivers helps you make better borrowing choices.

How the split shifts over time

A crucial feature of EMIs is that the principal–interest split changes as the loan ages, even though the total EMI stays the same. In the early months, most of your payment covers interest because the outstanding balance is large. As the balance shrinks, each EMI chips away more principal and less interest.

This is why the outstanding balance falls slowly at first and accelerates later. It also explains why prepaying early is so powerful — you remove principal while it is still large, wiping out all the future interest that balance would have generated.

Tenure, rate and total cost

Two levers control what a loan actually costs you:

• Tenure: A longer tenure lowers the monthly EMI but raises total interest, because you owe the balance for longer. A shorter tenure does the opposite. Choose the shortest term your budget comfortably allows.
• Rate type: Always compare loans on the reducing-balance rate. A "flat" rate charges interest on the full original amount for the whole term, so a 10% flat rate can cost as much as an 18% reducing-balance rate.

Getting ahead with prepayments

Extra payments are the single best way to cut a loan's cost. Every rupee you pay above your EMI goes straight against principal, and because interest is charged on the outstanding balance, that removes all the future interest the balance would have accrued.

Use the extra-monthly and one-time prepayment fields to model this. Directing an annual bonus into a one-time prepayment, or adding a modest amount to each EMI, can save several lakhs of interest and clear the loan years ahead of schedule — usually with no prepayment penalty on floating-rate individual loans under RBI rules.