Simple Interest Calculator

Quickly determine your interest and simplify your financial planning using our simple interest calculator for loans and savings.
Simple Interest Calculator

A simple interest calculator is a financial tool designed to compute the interest earned or payable on a principal amount over a fixed period at a pre-determined interest rate. It simplifies interest calculations by allowing users to input the principal amount, interest rate, and tenure, then instantly providing the simple interest amount and the total sum. A simple interest calculator is useful for personal finance management, small loans, and straightforward investments.

What is simple interest?

Simple interest is calculated only on the initial principal amount. It remains constant throughout the investment or loan term. The formula is I = P * r * t, where I is the interest, P is the principal amount, r is the annual interest rate, and t is the time in years.

What is simple interest calculator?

A simple interest calculator is a valuable tool for assessing interest on a principal amount. To use it, input the principal (initial amount of money), the interest rate, and the time the money is invested or borrowed. The calculator computes the interest, providing a clear understanding of the financial impact, helping you make better financial decisions.

How to calculate simple interest?

The formula for simple interest is I = P × R × T/100,

In this formula, the variables are as follows:


Simple Interest




Rate of Interest



To make it clear, I is the interest, P is the principal amount, r is the annual interest rate, and t is the time the money is invested or borrowed in years. Multiply the three values for the simple interest amount.

When do you use the simple interest formula?

The simple interest formula is used to calculate the interest earned or paid on a loan or investment when the interest is not compounded. It is commonly used for short-term loans or investments where interest is not added to the principal amount. Simple interest is often used in consumer loans, such as car loans or personal loans, where the interest is calculated based on the original loan amount and not on any previously accrued interest. For easier understanding:

When borrowing money: Individuals repay an additional sum of interest along with the borrowed amount. The simple interest formula aids in calculating the borrowing cost as interest.

When lending money: Individuals earn interest income in return for providing funds. Utilizing the simple interest formula enables one to easily determine the additional income earned as interest.

When investing money: Individuals who invest their surplus funds in schemes such as fixed deposits (FD), recurring deposits (RD), or savings schemes like Public Provident Fund (PPF), or Sukanya Samriddhi Yojana (SSY) can calculate their interest income using a simple interest calculator.

How to use our simple interest loan calculator?

Using our simple interest loan calculator is straightforward. Input the principal amount, annual interest rate, and the time the money is invested or borrowed in years. The calculator will promptly provide the simple interest amount. It's a convenient tool for quick financial planning and decision-making. Adjust inputs as needed for accurate results.

Advantages of using our simple interest loan calculator

Our simple interest loan calculator offers ease of use, providing quick and accurate results for interest calculations. It assists in financial planning, allowing users to assess loan terms transparently. The user-friendly interface ensures accessibility, making it a valuable tool for informed decision-making in loans and investments. To summarise, below are the key reasons why you should use an online simple interest calculator:

  • Accuracy: Online calculators provide precise calculations, eliminating human error.

  • Efficiency: Instant results save time compared to manual calculations.

  • Accessibility: Accessible from anywhere with an internet connection, making it convenient.

  • Comparison: Allows for easy comparison of different interest rates and terms.

  • Educational Tool: Helps users understand how interest is calculated.

  • Planning: Enables better financial planning by estimating interest costs accurately.

  • Convenience: Available 24/7, allowing users to calculate interest whenever needed.

  • Cost-Effective: Free to use, saving money on complex financial calculations.

  • User-Friendly: Typically, simple interfaces that are easy to navigate.

  • Privacy: Allows users to calculate interest without sharing personal financial details.

Frequently asked questions

How to calculate simple interest?

Calculate simple interest using the formula I = P * r * t, where I is the interest, P is the principal amount, r is the annual interest rate (in decimal form), and t is the time the money is invested or borrowed in years. Multiply the three values for the simple interest amount.

How does a simple interest calculator work?

It calculates interest using the formula: Interest (I) = Principal (P) × Rate (R) × Time (T). Users have to input these values, and the calculator provides the simple interest and total amount.

What is the difference between simple interest and compound interest?

Simple interest is calculated only on the initial principal, while compound interest considers both the initial principal and previously earned interest when calculating new interest.

Where can I use a simple interest calculator?

You can use it for loans, savings accounts, investments, and any situation involving fixed interest rates over a specific period.

Are there any online simple interest calculators available for free?

Yes, Bajaj Finance Limited offers free online simple interest calculator that is easy to use.

How simple interest calculator different from compound interest calculator?

A simple interest calculator calculates interest based solely on the initial principal and the interest rate, with no compounding. In contrast, a compound interest calculator factors in interest earned on both the principal and accumulated interest over time, accounting for compounding periods, providing a more dynamic and potentially higher result.

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