Interest Calculator

Calculate the monthly interest payable and plan your loan repayment with ease

What is an interest rate calculator?

An interest rate calculator is a tool used to determine the amount of interest earned or paid on a financial transaction. It allows users to input variables such as principal amount, interest rate, time, and compounding frequency to calculate the accrued interest accurately. With the help of our loan interest calculator, your monthly interest calculation can be done effortlessly. You get to know exactly how much you are liable to pay as interest throughout the loan tenure. Enter a few relevant details about the credit you need and acquire in-depth information regarding EMI, total interest payable and more.

How to calculate interest on loan using Bajaj Finserv interest calculator?

The online monthly interest calculator ensures quick computation on how to calculate interest and EMIs from the comfort of your home. Using a Bajaj Finance loan interest rate calculator is simple, with the interface being user-friendly. Here is how to use an interest rate calculator in three simple steps:

Step 1: Enter the loan amount you want to avail.
Step 2: Next, enter the rate of interest on your loan.
Step 3: Select the repayment period you wish to opt for and get accurate results instantly.

Methods of calculating interest

The two primary methods of calculating the interest are simple interest rates and compound interest rates.

1. Simple interest

Simple interest is a straightforward method of calculating interest earned or paid on a principal amount. It remains constant throughout the period and is calculated solely on the initial principal. Unlike compound interest, there's no consideration of interest earned or paid in previous periods. It's commonly used for short-term loans or investments where interest doesn't compound over time.

Simple interest formula

Here is the mathematical formula, on which a simple interest calculator works to compute the loan amount:

A = P (1+RT)

To calculate Interest Paid on a loan, the formula is

Interest = A – P.


  • A = Total Amount Paid
  • P = Principal Amount
  • R = Rate of Interest
  • T = Number of years

2. Simple interest example

Suppose you borrow Rs. 100,000 at a simple interest rate of 10% per annum for five years. The simple interest calculation yields Rs. 50,000 in interest, resulting in a total repayment of Rs. 150,000. Unlike compound interest, simple interest remains constant throughout the loan term, resulting in a straightforward repayment structure. This example illustrates the simplicity of calculating and understanding simple interest on loans in India, making it easier for borrowers to plan their repayments accurately without the complexities of compounding.

3. Compound interest

Compound interest is a method of calculating interest on an initial principal amount, including interest accumulated from previous periods. As time progresses, the interest is added to the principal, leading to exponential growth. Compound interest is commonly used in long-term investments, savings accounts, and loans, maximising returns over time.

Compound interest formula

Here is the mathematical formula, on which a compound interest calculator works to compute loan amount:

A = P (1 + r/n) ^ nt

To calculate Interest Paid on a loan, the formula is

Interest = A – P.

  • A = Total Amount Paid
  • P = Principal Amount
  • R = Rate of Interest
  • N = number of times interest is compounded per year
  • T = Number of years

Compound interest example

Let's say you borrow Rs. 100,000 at an annual interest rate of 10% with quarterly compounding. Over five years, the compound interest formula yields Rs. 61,051.02 in interest, resulting in a total repayment of Rs. 161,051.02. Compound interest in India, as elsewhere, amplifies the total repayment due to the effect of interest compounding periodically, demonstrating the significance of understanding compound interest in financial planning.

Difference between simple interest and compound interest


Simple interest

Compound interest

Calculation method

Calculated solely on the principal amount invested or borrowed.

Calculated on both the principal amount and the accumulated interest over time, resulting in interest on interest.


Simple Interest = Principal × Rate × Time

Compound Interest = Principal × (1 + Rate)^Time - Principal

Growth pattern

Linear growth pattern; interest remains constant throughout the investment or loan period.

Exponential growth pattern; interest accumulates over time, leading to a larger amount than simple interest for the same principal.

Impact on returns

Generally results in lower returns compared to compound interest, especially over longer periods.

Typically leads to higher returns compared to simple interest, particularly over extended durations, due to compounding effects.

Frequency of interest

Interest is calculated only once at the end of the investment or loan period.

Interest is calculated periodically, such as annually, semi-annually, quarterly, or monthly, and added to the principal for future calculations.

Advantages of using a loan interest rate calculator

Here are some benefits of utilising our interest calculator:

  • Accuracy: Our interest calculator ensures precise calculations, offering accurate figures for interest and repayments, eliminating errors and providing reliable financial insights.
  • Time efficiency: With swift result generation, borrowers save time, enabling them to make informed decisions promptly without delays in their financial planning or loan application processes.
  • Financial planning: By providing accurate repayment estimates, our calculator assists borrowers in planning budgets effectively, ensuring they can manage their finances efficiently and meet their repayment obligations.
  • Comparison tool: Borrowers can easily compare loan offers from different lenders using our calculator, facilitating informed decisions based on interest rates, repayment terms, and overall borrowing costs, optimizing their loan selection process.
  • Cost-effectiveness: Our interest calculator and personal loan calculator helps borrowers minimise overall borrowing costs by allowing them to evaluate various loan options and choose the most cost-effective solution tailored to their financial needs and capabilities..
  • Informed decisions: Empowering borrowers with comprehensive information, our calculator equips them to make informed decisions regarding loans, enabling them to choose the most suitable options aligned with their financial goals and circumstance.


Results generated by the calculator(s) are indicative in nature. The interest rate applied on the loan will depend on the prevailing rates at the time of loan booking.

The calculator(s) are not intended to provide its users/ customers with results that are either certified by Bajaj Finance Limited (“BFL”) or are an obligation, assurance, warranty, undertaking or commitment, financial and professional advice by BFL, under any circumstances. The calculator(s) is only a tool that assists the users/ customers arrive at results of various illustrative scenarios generated from data input by the user/ customer. The use of the calculator is entirely at the risk of the user/ customer, BFL is not responsible for any reason, for any errors in any outcome resulting from the use of the calculator.

Read More Read Less

Frequently asked questions

How to use an interest calculator?

Using the Bajaj Finserv Interest Calculator is easy. To use an interest calculator, enter the loan amount you want to avail. Next, enter the rate of interest on your loan charged by the lender followed by the repayment period you wish to opt for and get accurate results instantly.

How do you calculate simple interest on 11% interest rate?

To calculate simple interest at an 11% rate, multiply the principal amount by the interest rate and the time period (in years). The formula is: Simple Interest = Principal × Rate × Time.

What are the advantages of using a loan interest rate calculator?

A loan interest rate calculator provides quick insights into potential loan costs, aiding financial planning. It facilitates comparison of loan offers, ensuring informed decisions. By estimating repayments and total interest, it empowers borrowers to budget effectively. This tool promotes transparency, enabling users to assess affordability and optimize financial choices.

What is the difference between simple and compound interest?

Simple interest is calculated on your loan principal amount. However, a compound interest calculation depends on the original loan amount and the accumulated interest during a compounding cycle of the loan tenure.

Read more: Difference Between Simple interest and Compound Interest

What are the factors that affect personal loan interest rates?

There are several factors that influence the personal loan interest rate that an individual gets. These include the borrowers' monthly income, credit score, repayment history, debt-to-income ratio, and lender-borrower relationship. In order to gain a good interest rate on your personal loan, and thereby reduce the cost of borrowing, it is advisable to ensure that all of these parameters are healthy.

How can an interest calculator help you?

An interest calculator is an online tool that makes your interest calculations easy. Manually calculating interest on different loan amounts before applying can be a tedious task. Moreover, the chances of errors while making these calculations manually are higher as well. With an interest calculator, you can check the interest payable for different loans amount within just a few seconds. The output from the interest calculator, helps you to decide the loan terms with ease.

How can I calculate interest rates?

To calculate interest rates, use the formula: Interest = Principal × Rate × Tenure. This equation helps determine the interest rate on investments or loans.

What are the advantages of using a loan interest rate calculator?

A loan interest rate calculator offers several benefits. It provides accurate estimates of monthly payments, helping borrowers plan their budgets effectively. It aids in comparing various loan options, enabling informed decisions.

What is a 12% interest?

At 12% interest on the loan of Rs. 1 lakh for the tenure of 24 months amounts to Rs. 4707. Borrowers can use the interest calculator to know the interest payable for multiple loan amounts by inputting principal, interest rate, and tenure.

Show More Show Less