Published on Jul 15, 2025Updated on Dec 30, 2025
Calculating personal loan interest accurately is essential as it significantly impacts your total cost of borrowing. When you take out a personal loan, you're required to repay the principal amount along with the interest charged by the lender. This repayment is typically spread across equal monthly instalments (EMIs) over the chosen tenure.
Knowing how to calculate personal loan interest is essential, as the total interest paid over time can substantially affect the overall repayment amount. Being aware of this helps you plan your finances better and make informed borrowing decisions.
Understanding how EMIs work is essential for better financial planning, and learning how to calculate personal loan interest is a crucial part of this.
Let’s break it down using a simple example.
To calculate personal loan interest, you can use this standard EMI formula:
EMI = [P x R x (1+R)^N] / [(1+R)^N – 1]
Where:
Suppose you take a personal loan of INR 20,00,000 at an annual interest rate of 13% for 5 years. Here's how to calculate it:
This method allows you to calculate personal loan interest and plan your repayment strategy accordingly.
A personal loan interest rate is the percentage a lender charges annually on the loan amount you borrow. It determines how much extra you’ll pay over and above the principal over the loan tenure. This interest is typically repaid monthly as part of your EMI. If you’re wondering how much personal loan interest rates are, they typically vary based on several factors such as your credit score, income, loan amount, tenure, and lender policies at the time of loan application. A credit score of 750 or above, a stable income, and a debt-to-income ratio below 30% can significantly improve your chances of qualifying for a lower interest rate.
To calculate the personal loan interest component of your EMI for a particular month/instalment, you can use Excel's built-in formula:
=IPMT(rate, month_number, total_months, loan_amount)
Here’s how to fill it:
For example:
You borrow INR 5,00,000 at 13% interest for 60 months. To calculate interest for the first month:
=IPMT(13%/12, 1, 60, 500000) ≈ INR 5,417
If your EMI is INR 11,122, the principal for month 1 is INR 5,705 (INR 11,122 – INR 5,417).
Repeat the formula for each month (change the month_number) to calculate how the interest and principal portions change over time.
Lenders calculate personal loan interest rates based on several key factors that help assess a borrower’s risk profile and repayment capacity.
Your credit score is one of the first aspects lenders evaluate. A high CIBIL score (typically 750 or above) signals strong creditworthiness and may qualify you for lower interest rates. While lenders may have different minimum score requirements, a better score often translates into more favourable loan terms.
When lenders assess your loan application, the amount you want to borrow also plays a role in determining the interest rate. If you have a solid repayment history, you’re more likely to be approved for a larger loan at a competitive rate.
The chosen tenure impacts how you calculate personal loan interest over time. Shorter tenures generally mean higher EMIs but lower overall interest paid. On the other hand, longer tenures reduce your monthly burden but increase the total interest outgo over the loan’s duration.
Managing your finances wisely starts with understanding how to calculate personal loan interest and the factors that influence it. At SMFG India Credit, we offer competitive interest rates on personal loans, starting from just 13%* per annum. Use our EMI calculator to estimate your monthly outgo and apply online today to meet your personal or business goals with confidence.
* Please note that this article is for your knowledge only. Loans are disbursed at the sole discretion of SMFG India Credit. Final approval, loan terms, disbursal process, foreclosure charges and foreclosure process will be subject to SMFG India Credit's policy at the time of loan application. If you wish to know more about our products and services, please contact us
To secure a favourable personal loan interest rate, maintain a high credit score (preferably 750 or above), ensure a stable source of income, keep your debt-to-income ratio below 30%, and compare offers from multiple lenders. Choosing a shorter loan tenure can also help reduce the interest rate.
The lowest applicable interest rate depends on several factors, such as your eligibility, creditworthiness, repayment capacity, and lender policies at the time of loan application. SMFG India Credit offers competitive personal loan interest rates starting from 13%* per annum.
The RBI does not set personal loan interest rates directly. Instead, it regulates the repo rate, which influences how financial institutions set their lending rates for personal loans.
The formula for EMI is:
EMI = P * r * (1+r)^n/ ((1+r)^n-1)
Where,
P = principal
r = monthly interest rate
n = loan tenure
The interest rate is calculated on a monthly basis. If we consider annual ROI to be 13%, the calculation will be as follows:
R - 13/12/100 = 0.01083.
Let us continue with the above example. Consider the loan amount to be INR 20,00,000 with a tenure of 5 years/60 months and annual ROI of 13% (monthly = 0.01083). Using the formula EMI = P * r * (1+r)^n/ ((1+r)^n-1), the EMI is calculated to be INR 45,506. The total amount payable is INR 45,506 * 60 = INR 27,30,360.
The interest amount will be: INR 27,30,360 - INR 20,00,000 = INR 7,30,360.
A credit score of 750 and above shows strong creditworthiness. It will increase your chances of loan approval with a lower interest rate, provided you fulfil other eligibility criteria. Paying credit card dues or loans on time, not using too much credit, and not applying for too much credit at once are some ways you can improve your credit score.
A guarantor is only required if the applicant:
You can apply for a personal loan at SMFG India Credit without a guarantor as long as you have a credit score of at least 750 and a stable income source to repay without difficulty. If you have trouble with either, consider a co-applicant with a strong credit history and income source to avoid a guarantor. SMFG India Credit provides personal joint loans for family members.
Many factors affect the personal loan process at SMFG India Credit. Some of the most important are:
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