How EMI is calculated
Almost every Indian lender uses the reducing-balance method: each month, interest is charged only on the principal still outstanding. The fixed instalment that repays the loan exactly over its tenure is:
EMI = P × r × (1 + r)n ÷ [(1 + r)n − 1]
- P is the principal, the amount you borrow.
- r is the monthly interest rate: the annual rate ÷ 12 ÷ 100. A 9% annual rate is 0.0075 per month.
- n is the number of monthly instalments: tenure in years × 12.
If the interest rate is zero, the formula simply becomes P ÷ n. This calculator handles that case too.
Example: EMI on a ₹10 lakh loan at 9% for 5 years
- Monthly rate r = 9 ÷ 12 ÷ 100 = 0.0075
- Number of instalments n = 5 × 12 = 60
- (1 + r)n = 1.007560 ≈ 1.565681
- EMI = 10,00,000 × 0.0075 × 1.565681 ÷ 0.565681 ≈ ₹20,758
| Monthly EMI | ₹20,758 |
|---|---|
| Total paid over 60 months | ₹12,45,501 |
| Total interest | ₹2,45,501 |
In the very first month, interest is ₹10,00,000 × 0.0075 = ₹7,500, so only ₹13,258 of the EMI reduces your loan. By year five the picture reverses: of roughly ₹2.49 lakh paid that year, about ₹2.37 lakh is principal and only ₹11,730 is interest.
What affects your EMI
Loan amount
EMI rises in direct proportion to the amount borrowed. Double the loan and the EMI doubles, as long as rate and tenure stay the same. Borrowing less, through a larger down payment, is the most direct way to reduce both EMI and total interest.
Interest rate
Small rate differences add up. In the example above, a rate of 10% instead of 9% raises the EMI by about ₹489 a month and total interest by roughly ₹29,300. On longer loans, the same one-point difference costs far more because interest compounds over many more months.
Tenure
A longer tenure spreads repayment out and lowers the EMI, but you pay interest for longer. Stretching the ₹10 lakh loan from 5 to 7 years cuts the EMI to about ₹16,089 but raises total interest from ₹2.46 lakh to about ₹3.51 lakh.
Reading your amortization schedule
The schedule under the calculator shows, for every year or month, how much of your payments went to principal, how much to interest, and what you still owe. Use it to see how quickly you build equity, how much is still outstanding if you plan to prepay or refinance, and when principal starts to dominate your payments.
Tips to keep your EMI and interest under control
- Keep EMIs within your budget. Many lenders look for total EMIs to stay within roughly 40–50% of take-home income. A lower ratio leaves room for emergencies.
- Compare the rate type, not just the number. A “flat” rate charges interest on the original amount for the whole tenure and costs far more than the same reducing-balance rate.
- Prepay early if you can. Extra payments in the first years cut the balance when interest is highest, so they save the most.
- Look at total cost, not just EMI. Processing fees, insurance and prepayment charges all change what the loan really costs.
Taking a home loan? The Home Loan EMI Calculator adds quick amount presets and home-loan-specific guidance. For other loans, the Loan Calculator lets you enter tenure in months and shows interest as a share of the loan.