Interest Calculator

Use an online calculator to estimate loan costs easily and plan repayments in advance. This monthly interest calculator applies the standard interest calculation formula to help you understand interest payable, manage EMIs efficiently, and make informed borrowing decisions with clarity and confidence.

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 personal loan tenure. Enter a few relevant details about the credit you need and acquire in-depth information regarding EMI, total interest payable and more.

Our online calculator acts as a reliable financial calculator, enabling you to quickly calculate interest rates, EMIs, and repayment amounts for better loan planning and management..

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, without needing to manually input the interest calculator formula. 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.

Using the manual formula reverse calculation is also possible, i.e., you can calculate rate of interest from EMI amount, tenure, and total amount.

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. A higher simple interest rate on the principal amount can provide better returns on investments and vice versa. 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.

Where,

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

Simple interest example

Suppose you borrow Rs. 100,000 at a simple interest rate of 10% per annum for five years. Using the interest rate formula, the simple interest amounts to Rs. 50,000, making the total repayment Rs. 150,000. Unlike compound interest, simple interest remains fixed over the loan term, providing a clear and easy repayment structure. This example highlights how the interest rate formula simplifies loan calculations, helping borrowers plan repayments without the complexity of compounding.

2. 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

Aspect

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.

Formula

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.


Read more: Difference between simple interest and compound interest

Advantages of using a loan interest rate calculator

Using an interest calculator to compute EMIs offers quick, accurate results, helping you plan your finances better before you apply for personal loan. It allows you to compare loan options and choose the most affordable one. Interest calculator for loan is a helpful tool to understand the total cost of borrowing. 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. Interest amount calculators help in understanding the total cost of borrowing and enables in better decision-making.

Disclaimer

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.

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Frequently asked questions

How to use an interest calculator?

To use an interest calculator, enter the loan amount, interest rate, and repayment tenure. The calculator instantly displays the monthly interest, EMI, and total repayment amount. This helps compare loan options, adjust tenure, and understand affordability. Using an interest calculator eliminates manual errors and supports better financial planning before borrowing, ensuring clarity on repayment obligations and long-term costs.

What are the factors that affect personal loan interest rates?

Personal loan interest rates depend on credit score, income stability, employment type, loan amount, tenure, and lender policies. Market conditions, inflation, and RBI rates also influence pricing. Borrowers with strong credit histories and stable income usually receive lower rates, while higher-risk profiles attract higher interest rates to compensate lenders for the increased default risk.

How can an interest calculator help you?

An interest calculator helps you estimate EMIs, monthly interest, and total repayment before applying for a loan. It allows you to test different loan amounts and tenures, plan budgets accurately, and avoid over-borrowing. This tool supports informed decision-making by clearly showing the financial impact of interest rates on repayments.

How can I calculate interest rates?

You can calculate interest rates using standard formulas or online calculators. By entering the principal amount, tenure, and interest rate, you can find the interest payable and the EMI. Online tools simplify this process by automatically applying formulas, saving time and reducing calculation errors while helping borrowers understand repayment costs more clearly.

What is the meaning of the real interest rate?

The real interest rate refers to the interest rate adjusted for inflation. It shows the actual purchasing power of money earned or paid on a loan or investment. The real interest rate equals the nominal interest rate minus the inflation rate, helping borrowers and investors understand the actual cost or return in economic terms.

How do you calculate the monthly interest amount?

To calculate monthly interest, multiply the outstanding loan balance by the annual interest rate and divide by twelve. This shows the interest charged for that month. EMI calculators perform this automatically, adjusting the monthly interest as the principal reduces, helping borrowers track the repayment structure and understand how interest and principal components change over time.

How to calculate a fixed interest rate?

A fixed interest rate remains constant throughout the loan tenure. To calculate interest, apply the agreed rate to the loan principal for the entire period. EMIs stay unchanged, offering predictable repayments. Fixed-rate calculations are more straightforward and more stable, especially during volatile market conditions when floating rates may fluctuate significantly.

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

Simple interest is calculated using the formula: Principal × Rate × Time. For an 11% rate, multiply the principal by 0.11 and the loan duration in years. This method does not compound interest and is commonly used for short-term loans or for basic financial calculations to understand interest costs.

What is the difference between fixed and floating interest rates?

A fixed interest rate remains constant throughout the loan tenure, offering predictable EMIs; a floating interest rate changes with market conditions, RBI rates, or benchmarks. Fixed rates provide stability, while floating rates may start lower but can increase or decrease over time, affecting monthly repayments.

What is a return calculator?

A return calculator helps estimate investment returns based on the amount invested, the time period, and the expected rate of return. It shows maturity value, total gains, and growth trends. Investors use return calculators to compare options, plan financial goals, and understand how investments grow over time with compounding.

How is CAGR calculated?

CAGR, or Compound Annual Growth Rate, is calculated using the formula: (Ending Value ÷ Beginning Value)^(1 ÷ Number of Years) minus one. It shows the average annual growth rate of an investment over time, smoothing out fluctuations and helping accurately compare long-term performance across different investment options.

How is FV calculated?

FV, or Future Value, is calculated using the formula: FV = PV × (1 + r)^n, where PV is the present value, r is the interest rate, and n is the number of periods. It estimates how much an investment or savings will grow over time with compounding.

What is the power of compounding?

The power of compounding refers to earning interest on both the principal and previously earned interest. Over time, compounding significantly increases investment value or loan cost. The longer the duration and the higher the rate, the stronger the effect, making early investing beneficial and long-term borrowing more expensive if not managed carefully.

How do I convert a number to a percentage?

To convert a number into a percentage, multiply it by one hundred and add the percent symbol. For example, 0.25 becomes 25%. Percentages are widely used in finance to express interest rates, growth, discounts, and ratios, making comparisons easier and calculations more understandable in everyday financial decisions.

How do you calculate interest for half-yearly?

To calculate half-yearly interest, divide the annual interest rate by two and apply it for six months. Use the outstanding principal to find interest for that period. In compound interest, compounding occurs twice a year, increasing total interest compared to annual compounding, especially for long tenures.

What uncontrollable economic factors affect interest rates?

Uncontrollable factors affecting interest rates include inflation, RBI monetary policy, economic growth, global market conditions, and government fiscal policies. Changes in repo rates, liquidity, and inflation expectations directly influence lending rates. Borrowers cannot control these factors, but should monitor trends to choose suitable loan timing and interest structures wisely.

What controllable factors determine the interest rate on loans?

Controllable factors include credit score, income stability, employment type, loan amount, tenure, and existing liabilities. Maintaining good credit behaviour, making timely repayments, keeping debt low, and maintaining a stable income improve eligibility for lower interest rates. Borrowers can actively manage these factors to negotiate better loan terms and reduce borrowing costs.

How can I secure better interest rates on my loan?

To secure better interest rates, maintain a high credit score, repay dues on time, keep credit utilisation low, and avoid frequent loan applications. Compare lenders, choose a suitable tenure, and negotiate where possible. Applying with a stable income and minimal existing debt improves bargaining power and increases chances of lower interest rates.

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