What is an EMI?
EMI stands for Equated Monthly Instalment — a fixed amount you pay every month toward a loan until it's fully repaid. "Equated" means the payment itself doesn't change from month to month, even though what it's made of does: part of each instalment pays down the principal (what you borrowed), and part covers the interest (the lender's charge for lending it to you).
Early in the loan, most of your EMI is interest, because the outstanding balance is still close to the full principal. As the balance shrinks, more of each EMI goes toward principal instead — the payment stays flat, but what it buys shifts.
How EMI is calculated
Every bank in India uses the same reducing-balance formula:
EMI = P × R × (1 + R)N ÷ [(1 + R)N − 1]
- P — the principal, i.e. the loan amount
- R — the monthly interest rate (your annual rate, divided by 12 and by 100)
- N — the number of monthly instalments (tenure in years × 12)
What affects your EMI
- Loan amount. A bigger principal means a bigger EMI for the same rate and tenure.
- Interest rate. Even a 1 percentage-point difference compounds meaningfully over a 15–20 year home loan.
- Tenure. A longer tenure lowers the monthly EMI but increases the total interest paid, since interest keeps accruing for more months.
- Prepayments. Extra payments toward principal shorten the tenure or lower future EMIs.
Frequently asked questions
Why does the interest amount change every month even though the EMI is fixed?
Interest is charged on the outstanding principal, which falls a little with every EMI paid. Early instalments are mostly interest because the balance is still high; later ones are mostly principal. The EMI itself never changes — only the split within it does.
Does a longer tenure reduce the total cost of a loan?
No — a longer tenure lowers the monthly EMI but increases the total interest paid, because interest accrues for more months. A shorter tenure raises the EMI but reduces total interest.
Is this calculator accurate for my actual loan?
It uses the exact reducing-balance formula banks use, so the numbers are accurate for the principal, rate and tenure you enter. Your real EMI may differ slightly if your lender adds processing fees or your rate is floating.
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