How EMI is Calculated in India
EMI (Equated Monthly Instalment) is the fixed amount you pay every month towards a loan. It consists of two parts: principal repayment and interest. Most banks and NBFCs in India use the reducing balance method.
Last updated: Aug 3, 2026
Disclaimer: This is an educational explanation. Actual EMI may differ slightly due to rounding, fees, or lender-specific methods. Always confirm with the lender.
01
The Standard EMI Formula
$$ EMI = P \times \frac{r(1+r)^n}{(1+r)^n - 1} $$
$P$ = Loan principal (amount borrowed)
The amount you borrow from the bank.
$r$ = Monthly interest rate (Annual rate ÷ 12 ÷ 100)
The annual rate converted to a monthly decimal.
$n$ = Tenure in months
The total number of monthly payments.
02
Step-by-Step Calculation
Step 1
$$ \text{Monthly rate} = \frac{\text{Annual rate}}{12 \times 100} $$
Convert the annual interest rate into a monthly rate. Example: 8.5% per year → 8.5 / 12 / 100 = 0.007083.
Step 2
$$ \text{Tenure in months} = \text{Years} \times 12 $$
Convert tenure into months. Example: 20 years → 240 months.
Step 3
$$ EMI = P \times r(1+r)^n / ((1+r)^n - 1) $$
Plug the values into the formula to get the fixed monthly instalment.
03
Practical Example
| Loan amount | ₹50,00,000 |
| Interest rate | 8.5% p.a. |
| Tenure | 20 years (240 months) |
| Monthly rate $r$ | 0.007083 |
| EMI | ≈ ₹43,391 |
Total amount: ≈ ₹1.04 crore Total interest: ≈ ₹54.14 lakh
Over 20 years, you will pay the total amount shown above — of which roughly half is interest. You can verify this instantly using the Home Loan EMI Calculator or Personal Loan Calculator.
04
Why the Formula Works This Way
In the early years, a larger portion of the EMI goes towards interest. As the outstanding principal reduces, the interest component falls and more of your EMI starts reducing the principal. This is why prepayment in the early years saves more interest.
05
Common Mistakes People Make
Comparing only the interest rate without checking if it is flat or reducing.
Ignoring processing fees and other charges that add to the real cost of the loan.
Assuming the EMI stays the same if they make part-prepayments (it usually does not — either EMI or tenure changes).