What is an EMI?
An EMI, or equated monthly installment, is the fixed amount you pay your lender every month until a loan is fully repaid. Each EMI covers two things: the interest charged on the balance you still owe, and a slice of the principal (the amount you borrowed). Home loans, car loans, personal loans and most consumer finance plans use this reducing-balance method.
In the first months most of your EMI goes toward interest, because the outstanding balance is at its highest. As the balance falls, the interest part shrinks and more of each payment reduces the principal. The amortization schedule above shows this shift year by year or month by month.
How to use the loan EMI calculator
- Enter the loan amount you plan to borrow.
- Enter the annual interest rate quoted by your lender (not the monthly rate).
- Enter the tenure and choose whether it is in years or months.
- Read your monthly EMI, total interest and total payment instantly, then open the amortization schedule for the full breakdown or download it as a CSV file.
The EMI formula
EMI = P × r × (1 + r)n ÷ ((1 + r)n − 1)
- P is the principal, the amount borrowed.
- r is the monthly interest rate: the annual rate divided by 12 and by 100. A 9.5% annual rate gives r = 0.0079167.
- n is the number of monthly installments.
When the interest rate is zero the formula simplifies to the principal divided by the number of months. The calculator handles that case automatically.
Worked example
Suppose you borrow 100,000 at 10% a year for 12 months. The monthly rate is 10 ÷ 12 ÷ 100 = 0.008333, and (1 + r)12 = 1.10471. Plugging these into the formula gives an EMI of 8,791.59. Over the year you pay 105,499.06 in total, so the loan costs 5,499.06 in interest.
Stretch the same loan to 24 months and the EMI drops to about 4,614.49, but total interest rises to roughly 10,747.82. A longer tenure lowers the monthly burden while raising the overall cost, which is the trade-off this calculator helps you see.
More worked examples
Car loan: $25,000 at 7% a year over 5 years (60 payments) works out to about $495.03 a month, with roughly $4,701.80 paid in interest.
Personal loan: ₹5,00,000 at 11% for 3 years gives an EMI of about ₹16,369, and about ₹89,297 of interest over the term.
Tips to reduce the interest you pay
- Compare the annual percentage rate (APR), which includes fees, not just the headline rate.
- Choose the shortest tenure you can comfortably afford. Fewer months means less time for interest to build up.
- Make prepayments early. Extra payments in the first years cut the balance when interest is highest. Check whether your lender charges a prepayment penalty first.
Common mistakes to avoid
- Entering the monthly rate as the annual rate. Lenders quote an annual rate; the calculator divides it by 12 for you.
- Comparing loans by EMI alone. A longer term lowers the EMI but raises the total cost. Compare total interest too, or check the simple interest calculator if a lender quotes a flat rate.
- Forgetting fees. Processing fees and insurance are not part of the EMI formula, so add them separately when comparing offers.
Sources and methodology
The calculations on this page follow these published standards and references. The code is covered by automated tests against known values.
- Standard annuity (reducing-balance) loan formula, as used by banks for fixed-rate loans
- Consumer Financial Protection Bureau – Buying a house