Compound Interest: Explained With Calculations and Examples

Personal Finance

Compound interest is interest that builds up over some time. It impacts both the principal and the interest. It is used for broader aspects of finances. With the updates in the technical field, the finance sector is also keeping up with change. The CAGR calculator for easy and quick assessment of interest is now available. Below are the details about compound interest and the CAGR formula. Read on to learn more.

Explain About Compound Interest

The interest paid on the principal and compounded from time to time is called compound interest. The interest is worked out regularly. When the initial debt amount and gathered interest are added, you get a new debt amount. The initial principal plus the interest already accrued make up the new principal. 

Compound Interest = Interest on Principal + Compounded Interest at Regular Intervals.

Compound interest is calculated annually, semi-annually, quarterly, or even monthly. This is similar to how the interest that is funded gears up the growth of the debt amount over time. It is what money does due to compound interest. Banks/NBFCs use compound interest to compute the amount.

The amount of compounded interest increases as the number of compounding periods. Consider it as a snowball. Your snowball will still get bigger the sooner you start saving and the additional money you put into it. Consider what would happen if you threw the snowball down a snow-covered slope. Now that you’ve packed additional snow, then that will remain, and you’ll continue to do so. Your snowball would ultimately include the snow you began with, the snow you collected over the years, and more snow on top of it when it touches the bottom of the hill.

What Makes Compound Interest so Crucial?

Your income rises more quickly due to compound interest. Since you will receive returns on both the money you invest and returns after each compounding period, it causes a sum of money to increase more quickly than with simple interest. As a result, you won’t need to save as much money to achieve your objectives.

When wealth accumulation, the power of compounding can be crucial. The earlier you start saving money in an interest-bearing account, the more compound interest you can earn. It’s essential for assisting in the mitigation of wealth-depleting causes, including rising living expenses, inflation, and declining buying power.

How to Calculate Compound Interest?

The interest gathered on both the principal and interest is compound interest. The initial and subsequent debt amount rises with the addition of the interest earned at each period.

To calculate compound interest, use the following method:

Step 1: Take note of the given principal, rate, and time.

Step 2: Use the formula to assess the amount- A = P(1 + r/100)n. 

Step 3: Using the equation CI = Amount – Principal to assess the compound interest.

The interest is calculated for the new principal at regular intervals when the accrued interest is added to the current principal. You get the final amount when the initial amount and interest are added.

Compound Interest = Interest on Principal + Compounded Interest at regular intervals.

Explain Compound Interest Formula

Calculations for compound interest can be done annually, biannually, quarterly, or even weekly. This is comparable to how reinvested interest on a single investment speeds up the principal’s growth over time. Money behaves in this way when interest is compounded. Banks and other financial institutions only calculate the amount using compound interest.

I = P( 1 + r/n) tn – 1


I = Interest amount.

P = Principal amount.

r = Interest rate.

t = Time.

n = Number of times the interest is compounded in a year.

How Can a CAGR Calculator Help You?

The CAGR calculator can reveal several aspects of your firm that are not known. In contrast to the idea of “absolute returns,” growth based on CAGR considers the factor of time. Therefore, it provides a better picture of growth over time.

The CAGR calculator is a fictional number. In its simplest basic form, it gives the precise growth rate of an investment when returns are funded again. It also assesses the investment up/down at the same rate. CAGR is useful while making decisions on where to invest and how much to invest.

You may calculate your annualised true returns on investment using a CAGR calculator. This way, using the CAGR calculator online, which is free, saves you time and effort.

What are the Methods of CAGR? 

A PV of Rs. 1 lakh initial funding in a firm. The CAGR is as follows if the entire investment has increased to Rs 10 Lakh (FV) after 5 years (N):

(10,00,000/1,00,000)1 / 5 – 1 or 0.589

Thus, the CAGR percentage is CAGR x 100 or 58.9%

How to Use the CAGR Calculator?

A straightforward online calculator, CAGR is incredibly precise and simple to use. This technology provides immediate results owing to user inputs. It determines two types of ROI:

  • Absolute returns and
  • Compound Annual Growth Rate (CAGR)

You need to put three values to get the desired result from an online CAGR calculator

  • Funding Amount – Your total funding amount.
  • Amount at the end of the period – total maturity value.
  • Time Period – overall time of total funding (in years).

After entering the required information, click “Calculate” to check your fundings’ absolute returns or CAGR.

The CAGR calculator assesses the overall gains. It also gives CAGR or Absolute Returns based on the above information (%). You will also see a growth chart of your funds. 


Compound interest is the type of Interest calculated on a loan or deposit amount. It considers both the debt amount and Interest earned. Compound interest differs from simple Interest. The earlier one considers the debt amount and any interest that has built up. Whereas simple Interest only takes the principal amount. Now you’ve all the required information regarding compound interest. For more details, you must visit Piramal Finance. They have many articles and blogs to help you learn about various interest types.