Minus/plus icon
ResourcesExplore the full ACKO experience and make the most of your plan

Simple Interest Calculator

Quickly calculate simple interest with our user-friendly tool

The only insurance you need for your life's changing needs

Starting at ₹534/month*

A product of ACKO Life Insurance - ARN: L0021

Simple Interest Calculator

Home / Life Insurance / Calculators / Articles / Simple Interest Calculator

Mastering personal finances is crucial in today's fast-paced world. Whether you're saving for a dream vacation, buying a car, or making investments, understanding interest is key. That's where the Simple Interest Calculator comes in. In this article, we'll explore its benefits and how it helps you make informed financial decisions.

What is interest?
Jump Tag Icon

Before we delve into the Simple Interest Calculator, let's take a moment to understand the fundamentals of interest. Interest is the additional amount of money that lenders or financial institutions charge borrowers for the privilege of borrowing funds. It acts as compensation for the risk undertaken by the lender and as an incentive to lend money. There are two primary types of interest: simple interest and compound interest. Both are useful in understanding the profit or additional amount you pay, upon investment and repayment of loan respectively.

What is simple interest?
Jump Tag Icon

Simple interest refers to a basic method of calculating interest on a loan or investment. It is a straightforward approach where interest is calculated solely on the principal amount. In simple terms, the interest amount remains constant throughout the duration of the loan or investment period, without taking into account any additional factors. The calculation of simple interest involves three primary variables: the principal amount, the interest rate, and the time period. By applying the simple interest formula, the interest amount can be determined, providing a clear understanding of the financial implications involved.

Simple Interest Calculator

Secure Regular Earnings Using a Systematic Withdrawal Plan

Principle amount
Rate of interest(p.a)
Time peroid
Total at the end of 5 years
₹ 0
Priciple amount
₹ 0
Total interest
₹ 0

What is a Simple Interest Calculator?
Jump Tag Icon

The Simple Interest Calculator is a user-friendly online tool that assists you in determining the amount of interest you'll accumulate on a loan or investment within a specific timeframe. Simply enter the principal amount, interest rate, and duration, and the calculator will quickly compute the accrued interest, delivering precise and immediate results.

What are the benefits of using a Simple Interest Calculator?
Jump Tag Icon

Here are the benefits of using the simple interest calculator.

  1. Time-saving: With a Simple Interest Calculator, complex calculations become a breeze. Instead of spending valuable time manually crunching numbers, this handy tool swiftly provides accurate results, saving you time and effort.

  2. Accuracy: Human errors can occur when calculating interest manually, leading to potentially costly mistakes. By using a Simple Interest Calculator, you eliminate the risk of miscalculations, ensuring precise results every time.

  3. Financial Planning: Whether you're planning to take out a loan or considering an investment, a Simple Interest Calculator empowers you to make informed financial decisions. By knowing the exact amount of interest you will be charged or earn, you can plan your budget and allocate your funds wisely.

How to use a Simple Interest Calculator?
Jump Tag Icon

If you find yourself uncertain about the gains you will accumulate at the end of a maturity period, using a simple interest EMI calculator can provide the clarity you need. With this user-friendly tool, calculating the result is a matter of seconds. Simply input the principal amount, interest rate, and time value, and let the calculator do the rest. Follow the steps below to calculate your interest with ease.

Simple Interest Formula
Jump Tag Icon

The calculation of simple interest involves the use of a specific formula S.I. = (P × R × T)/100. To gain a deeper understanding of this formula, let's break it down further.

The simple interest formula mentioned above can also be rearranged to solve for any of the variables: P, R, or T. For instance, by dividing both sides of the SI formula:

S.I. = (P × R × T)/100 by R × T

we obtain P = (100 × S.I.)/(R × T). Likewise, we can solve for either R or T using similar algebraic manipulations.

The simplified version of the formula, often seen in practice, is written as SI = PRT, where R is the rate of interest expressed as a decimal. For example, if the rate of interest is 5%, R can be written as 5/100 = 0.05.

Amount = Principal + Simple Interest

This relationship can be expressed as 

A = P + S.I.

By substituting the formula for simple interest (SI = PRT) into the equation, we obtain 

A = P + PRT.

Simplifying further, we can rewrite the equation as A = P(1 + RT).

Difference between Simple Interest and Compound Interest
Jump Tag Icon

The following table lists the differences between simple vs. compound interest.


Simple Interest

Compound Interest


Interest is calculated only on the principal amount.

Interest is calculated on the principal amount and accumulated interest.


S.I. = (P × R × T)/100

C.I. = P × (1 + (R/100))^T - P

Growth Pattern

Linear growth

Exponential growth

Effect on Principal

Principal remains constant throughout the duration.

Principal increases with the addition of interest.

Interest Calculation

Interest is constant throughout the duration.

Interest compounds over time, resulting in increasing interest amounts.

Total Amount

Total amount = Principal + Interest

Total amount = Principal + Compound Interest

Frequency of Calculation

Interest is calculated once at the end of the duration.

Interest can be calculated yearly, semi-annually, quarterly, monthly, etc. depending on the compounding frequency.

Financial Impact

Suitable for short-term loans or investments with a fixed interest rate.

More advantageous for long-term loans or investments with a varying interest rate.

Return on Investment

Provides a predictable return.

Potentially generates higher returns due to compounding.


A fixed deposit with a 5% annual interest rate for 2 years will yield the same interest each year.

A fixed deposit with a 5% annual interest rate for 2 years will yield increasing interest amounts each year due to compounding.

Why to use the Simple Interest Calculator?
Jump Tag Icon

Here is a list of reasons why you should use the Simple Interest calculator.

  1. Precise Financial Calculations: The Simple Interest Calculator ensures precise calculations based on the principal amount, interest rate, and time period. By relying on accurate results, you can make informed decisions regarding your financial planning.

  2. Efficient Time Management: Manually calculating simple interest can be time-consuming and prone to errors. The calculator saves you valuable time by swiftly providing the calculated interest amount, allowing you to focus on other important financial matters.

  3. Empower Financial Planning: By using the Simple Interest Calculator, you gain a clearer understanding of the interest amount involved in loans or investments. This knowledge empowers you to effectively plan and allocate your funds, making sound financial decisions.

  4. Compare and Contrast: The calculator enables you to compare different interest rates and time periods effortlessly. You can assess how various scenarios impact the total interest accrued, assisting you in selecting the most advantageous loan or investment option.

  5. Versatile Tool: Whether you need to calculate interest for personal loans, educational loans, mortgages, or investments, the Simple Interest Calculator is adaptable to diverse financial scenarios. It caters to your specific needs, providing accurate results for various applications.

  6. Accessible and User-Friendly: Simple Interest Calculators are easily accessible online, often accompanied by a user-friendly interface. You can conveniently use them on any device with internet access, including desktop computers, laptops, smartphones, and tablets.

  7. Simplifies Complex Formulas: By using the Simple Interest Calculator, you eliminate the need to remember or manually apply intricate formulas for calculating simple interest. The calculator handles the calculations automatically, saving you from tedious computations.

  8. Boosts Financial Literacy: Engaging with the Simple Interest Calculator enhances your financial literacy. By interacting with the calculator and understanding how interest is calculated, you develop a stronger grasp of financial concepts, empowering you to make informed financial decisions.

  9. Minimises Costly Errors: Manual calculations of interest entail the risk of making errors that could lead to costly mistakes. By relying on the Simple Interest Calculator, you mitigate such risks, ensuring accurate calculations and avoiding potentially expensive financial setbacks.

  10. Free and Widely Available: Simple Interest Calculators are readily available online, and many financial websites, banking institutions, and personal finance platforms offer them as valuable resources. Accessing these calculators comes at no cost, making them a convenient and cost-effective tool for your financial calculations.

Frequently Asked Questions (FAQ)
Jump Tag Icon

Here are some common questions about simple interest calculators.


Can a Simple Interest Calculator be used for both loans and investments?

Yes, a Simple Interest Calculator can be used for both loans and investments. Whether you want to know the interest on a loan you're planning to take or the interest you'll earn on an investment, the calculator will provide accurate results in both scenarios.

What other variables can be calculated using a Simple Interest Calculator?

In addition to calculating the accrued interest, a Simple Interest Calculator can also determine the principal amount, interest rate, or time period when provided with the other variables. It offers flexibility in solving for any missing variable.

Are the results from a Simple Interest Calculator accurate?

Yes, the results from a Simple Interest Calculator are accurate. The calculations are based on the provided inputs and follow the simple interest formula. 

Is a Simple Interest Calculator suitable for all types of interest rates?

Yes, a Simple Interest Calculator can be used with any type of interest rate, such as fixed or variable rates. It functions effectively regardless of the interest rate structure.

Can a Simple Interest Calculator be used for compound interest calculations?

No, a Simple Interest Calculator is specifically designed for simple interest calculations. For compound interest calculations, a separate calculator or a compound interest calculator should be used.

Are Simple Interest Calculators available online for free?

Yes, there are numerous Simple Interest Calculators available online for free. Many financial websites and banking institutions provide these calculators as a helpful resource for their users

Can a Simple Interest Calculator be used on mobile devices?

Yes, Simple Interest Calculators are often designed to be mobile-friendly, allowing users to access and use them conveniently on smartphones and tablets. They can be accessed through mobile browsers or dedicated calculator applications.

Disclaimer: The content on this page is generic and shared only for informational and explanatory purposes. It is based on industry experience and several secondary sources on the internet, and is subject to changes.