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- Compounding Formula
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**Compounding Formula (Table of Contents)**

### What is Compounding Formula?

Compounding can be considered an amount of interest that is earned on an investment or on an account where the interest is also reinvested. The formula for compounding is represented as below

**C = P [ (1+r)**

^{n}– 1 ]Where,

- C is the compound interest
- P is the principal amount
- r is the rate of interest
- n is the number of periods

### Explanation of the Compounding Formula

The formula is very useful and is powerful when one wants to calculate compound interest. This equation takes into consideration the principal amount, the rate of interest, the frequency at which it shall pay an interest rate. The equation in itself compounds the interest amount which is earned and reinvested. This gives the effect of multiplication and the amount grows more than what growth it achieved in the earlier years. Hence, this is more powerful than the simple interest which only pays with the same amount of interest every year.

### Examples of Compounding Formula (with Excel Template)

Let’s see some simple to advanced examples of the compounding formula to understand it better.

#### Example #1

**Mr. V deposited $100,000 in HFC bank for a period of 2 years and the bank pays 7% interest which is compounded annually. You are required to compute the compounded interest amount.**

**Solution**

** **All of the variables that are required in the formula are given, hence we can use the above formula to calculate compound interest.

Use the below data for calculation of compound interest.

Therefore, calculation of compound interest can be done using the above formula as,

4.9 (1,067 ratings)

- = 100,000 [ (1+7%)
^{2}– 1 ] - = 100,000 [ (1.07)
^{2}– 1 ]

**Compound Interest will be –**

**Compound Interest = 14,490.00**

Hence, the amount of interest will be 14,490 on the amount invested.

#### Example #2

**KBC bank has just launched a new product to compete with the existing market product. They believe this would be the winning game for them. Below are the details of both of the schemes. Mr. W was interested to invest in New Scheme as he was shown by the bank that the interest amount he would earn at maturity would be 37,129.99 and 52,279.48 on the existing scheme and a new scheme. You are required to validate the statement made by the banker.**

**Solution**

Here, we need to do a comparison of the schemes and Mr. W will surely get lured by seeing the difference of interest earned. But, however, there is a mismatch in a number of years and hence cannot be compared to the interest of 37,129.99 verses 52,279.48 as one is for 4 years and the other one is for 5 years. Hence, we will calculate compound interest for 4 years using the below formula.

**Existing Scheme**

Therefore, the calculation of compound interest for the existing scheme can be done as follows,

- = 100,000 [ (1+(7.92%/12))
^{(4*12)}– 1 ] - = 100,000 [ (1.0198)
^{48}– 1 ]

**Compounding Interest of Existing Scheme will be –**

**Compound Interest = 37,129.99**

**New Scheme**

Therefore, calculation of compound interest for the new scheme can be done as follows,

- = 100,000 [ (1+(8.50%/4)
^{(5*4)}– 1 ] - = 100,000 [ (1.02125)
^{48}– 1 ]

**Compounding Interest of New Scheme will be –**

**Compound Interest = 52279.48**

As we can see the difference is not that much major, but as we can see the difference is of approx. 15149.5 and further, there is one year more of the lock-in period. Hence, it’s up to Mr. W whether he requires funds in 4 years and then he can go for the existing scheme and it appears that the bank is luring customers by displaying such a high value of interest difference and lock funds with bank for one more year.

#### Compounding Example #3

**Mr. Vince is interested in purchasing the house but he does not want to take a loan burden. He learns about Mutual fund in an advertisement and he is keen to know that on an average the return on a mutual fund is 10-12% if kept invested for 10 years or more. The house that he wants to purchase is valued at 5,000,000. Hence, he approaches financial advisors to know what amount he should invest every month in order to reach the goal. The financial advisor takes 11.50% as an annual interest rate compounding monthly and considers staying invested for 12 years one-time investment of 1,700,000. You are required to compute the income earned on the investment if Mr. Vince stays invested for 12 years.**

**Solution**

We are given all the details here, and we can use the below formula to calculate the income that will be derived by investing 10,000 monthly for 12 years at a rate of 11.50% compounded monthly.

Use the below data for calculation of compound interest.

Therefore, calculation of compound interest can be done using the above formula as,

- = 1,700,000 [ (1+(11.50%/12)
^{(12*12)}– 1 ] - = 1,700,000 [ (1.02125)
^{144}– 1 ]

**Compound Interest will be –**

**Compound Interest= 50,13,078.89**

Hence, if Mr. Vince stays invested for 12 years he would be able to reach his goal of buying the house assuming he earns 11.50%.

### Relevance and Uses

The compound interest formula is used in many instances like for calculating recurring fixed deposit income, mutual fund returns, also in capital markets like in growth in sales, profit, etc. by financial analysts. The formula looks simple, but the effect it has is very large in the longer term. Many of the banks use compounding in their housing loans, vehicle loans, education loans which are the major chunk of the revenue sources. The power of compounding can make one wealthy in the long term.

### Recommended Articles

This has been a guide to Compounding Formula. Here we discuss step by step how to calculate compound interest using its formula along with practical examples and downloadable excel template. You can learn more from the following articles –

- Capital Market | Merits | Demerits
- Formula of Continuous Compounding
- Calculate Compound Interest Formula in Excel
- Calculate Daily Compound Interest
- Formula of CAGR

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