CodeMaster AcademyThe math behind a monthly EMI
An Equated Monthly Installment is calculated using a standard amortization formula: EMI = P × r × (1+r)^n / ((1+r)^n - 1), where P is the loan principal, r is the monthly interest rate (annual rate divided by 12), and n is the total number of monthly payments. What that formula guarantees is that every installment is the same fixed amount for the full loan term — even though the split between interest and principal within each payment shifts over time.
Why early payments are mostly interest
In the first years of a loan, most of your EMI goes toward interest, with only a small slice reducing the principal — because interest is calculated on the outstanding balance, which is highest at the start. As the balance shrinks, the interest portion of each EMI shrinks too, and more of the fixed payment goes toward principal. This is why paying off a loan early saves more in interest than the same extra payment made near the end of the term.
What changes your EMI
Three inputs drive the number: loan amount, interest rate, and tenure. Extending the tenure lowers your monthly payment but increases total interest paid over the life of the loan, since you're paying interest for longer. A shorter tenure raises the EMI but reduces total interest — worth checking both scenarios before committing to a loan term.
Using this calculator
Enter the loan amount, annual interest rate, and tenure in months or years. The calculator returns your monthly EMI, total interest payable over the loan term, and total repayment amount, computed instantly and locally in your browser.
Common questions
Does this include processing fees or insurance?
No — this calculates the standard amortization-based EMI from principal, rate, and tenure only. Lenders often add processing fees, insurance premiums, or other charges on top, which aren't reflected in this figure.
Why does my bank's EMI amount differ slightly from this result?
Small differences usually come from rounding conventions or a slightly different day-count method used by the lender; the core formula is standardized, but implementation details can shift the final rupee or two.
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Page last reviewed: July 2026