How Is EMI Calculated? Understanding Loan Amount, Interest Rate and Tenure
Understand how EMI is calculated using loan amount, interest rate and tenure, including the reducing-balance formula and what changes your monthly payment.
EMI stands for Equated Monthly Instalment. For a standard reducing-balance loan with regular monthly payments, the EMI depends mainly on the principal amount, interest rate and number of monthly instalments.
How Is EMI Calculated?
A commonly used reducing-balance formula is:
EMI = P × r × (1 + r)n ÷ ((1 + r)n − 1)
- P = principal loan amount
- r = monthly interest rate as a decimal
- n = total number of monthly instalments
If the quoted annual interest rate is R percent and interest is applied monthly, a common conversion is r = R ÷ (12 × 100).
Example Calculation
Suppose the principal is ₹5,00,000, the annual interest rate is 10% and the tenure is 5 years. Using a monthly rate of 10 ÷ (12 × 100) and 60 monthly instalments gives an EMI of approximately ₹10,624. Actual amounts can vary with the lender's calculation conventions and terms.
How Loan Amount Affects EMI
With the interest rate and tenure unchanged, borrowing a larger principal generally produces a higher monthly EMI and a higher total repayment.
How Interest Rate Affects EMI
A higher interest rate generally increases the EMI and the total interest paid. Even a small rate difference can become meaningful over a long repayment period.
How Tenure Affects EMI
A longer tenure can reduce the monthly EMI because repayment is spread across more instalments. However, extending the tenure can increase the total interest paid.
Reducing-Balance vs Flat-Rate Calculations
The formula above describes a common reducing-balance method. Some products may use different calculation methods or include fees and other charges. Do not assume that a calculator estimate represents the complete cost of a particular loan.
Fixed and Floating Interest Rates
With a fixed rate, the stated rate is generally kept constant for the applicable period. With a floating rate, the rate can change according to the product's terms, which can affect future instalments or repayment schedules.
Calculate Your EMI
Use the iToolsera Loan EMI Calculator to estimate monthly EMI, total interest and total repayment for different loan amounts, rates and tenures.
Note: This guide is for general educational purposes. Actual loan terms, fees, rates and calculation methods depend on the lender and product. Review the applicable loan documents before making a financial decision.