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What is Compound Interest, And How Do I Calculate it?

Compound interest is a type of interest that is calculated on both the principal amount and the accumulated interest from previous periods. Read ahead to know all about it.

  • Mar 13, 2023

    Key takeaways

  • Compound interest is the interest that is earned on the initial principal amount as well as the accumulated interest from previous periods.
  • Compound interest is important for investing, borrowing, and saving.
  • Compound Interest formula is A = P (1 + r/n)^(nt)
  • Tax-deferred accounts like 401(k)s, and IRAs allow you to defer taxes on your contributions and earnings until you withdraw the money in retirement.

Compound interest is an essential financial concept that can help you grow your savings and investments over time. Whether you are saving for a long-term goal or investing your money, understanding compound interest is crucial to achieving your financial objectives. In this article, we will discuss some of the important questions like what is compound interest, What is the formula of compound interest, and how to calculate compound interest?

What is Compound Interest?

Compound interest is the interest that is earned on the initial principal amount as well as the accumulated interest from previous periods. Or, to put it another way, it’s interest on interest. Unlike simple interest, which only accrues on the principal amount, compound interest allows for the exponential growth of your savings or investments.

What is a Compound Interest Calculator?

A compound interest calculator is a powerful tool that helps investors calculate the potential returns on their investments over time. It’s a simple yet effective way to understand how much money you can make on an investment, taking into account the interest rate, the principal amount, and the length of time you plan to invest.

How to Calculate Compound Interest?

Calculating compound interest can be a bit complex. The formula for calculating compound interest is

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


A represents the total sum, including interest.

P equals the principal sum

r equals the annual interest rate (as a decimal)

n is the number of compounding periods per year.

t is the duration in years.

Let’s say you invest ₹10,000 in an account that earns 5% compound interest annually. After one year, you would earn ₹500 in interest, bringing your total balance to ₹10,500.

In the second year, you would earn interest not only on the ₹10,000 principal but also on the ₹500 of interest earned in the first year. This would result in a total balance of ₹11,025 at the end of the second year, and the interest earned in the third year would be based on this higher balance. Over time, this compounding effect can result in significant growth of your savings or investments.

Why is Compound Interest Important?

Compound interest is essential because it allows your savings or investments to grow faster than they would with simple interest. By reinvesting your earned interest, you can take advantage of the compounding effect, which can result in significant growth over time.

Where Does the Concept of Compound Interest Fit in?

Compound interest is important for investing, borrowing, and saving. Investing in an instrument that earns compound interest means interest earned is added to the principal, and the new total amount earns interest in the next period. When borrowing, the interest charged in each period is added to the principal, and the interest for the next period is calculated on the new total amount. By investing in instruments that earn compound interest, our savings can grow exponentially over time.

How Can You Use Compound Interest to Understand Different Investment Plans?

Let’s consider two investment plans - Plan A and Plan B, with different interest rates and compounding frequencies.

Plan A offers a 6% annual interest rate compounded annually.

Plan B offers a 5% annual interest rate, compounded quarterly.

Assuming an initial investment of ₹10,000 in both plans, let’s calculate the returns over ten years.

Plan A: After ten years, your investment will be worth ₹17,908, with a total interest earned of ₹7,908.

Plan B: After ten years, your investment will be worth ₹17,991, with a total interest earned of ₹7,991.

Although Plan A offers a higher interest rate, Plan B’s more frequent compounding frequency results in higher returns over ten years.

Similarly, you can use the concept of compound interest to compare other investment plans, such as fixed deposits, mutual funds, and stocks. It is essential to compare the returns based on the same compounding frequency to get a fair idea of the returns on investment.

How to Use Compound Interest As a Tool for Financial Planning?

Compound interest is one of the most powerful tools available to anyone who wants to create wealth and achieve financial freedom. Here are some ways to use compound interest as a tool for financial planning.

Start Saving Early

The earlier you begin saving, the more time your funds have to grow. This is why it’s important to start saving as soon as possible, even if it’s just a small amount. If you can start saving in your 20s, you will have decades to benefit from compound interest.

Take Advantage of Tax-Deferred Accounts

Tax-deferred accounts like 401(k)s, and IRAs allow you to defer taxes on your contributions and earnings until you withdraw the money in retirement. This means that your money can grow faster because you don’t have to pay taxes on your earnings each year. Make sure to take advantage of these accounts and contribute as much as you can each year.

Wrapping Up

Compound interest is the interest earned on both the principal amount and any accumulated interest over time. This means that the amount of interest earned increases over time as the interest is added to the principal. To calculate compound interest, you will need to know the initial principal amount, the interest rate, the number of compounding periods per year, and the length of time the interest will be compounded for. Once you have these figures, you can use a formula or an online calculator to determine the final amount that will be earned.

In this policy, the investment risk in the investment portfolio is borne by the policyholder.

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