Compound Interest Calculator

Use this Compound Interest Calculator to estimate how your investment grows over time with different compounding frequencies and interest rates.

Enter values and click Calculate

What is Compound Interest and How It Works

The Compound Interest Calculator helps you understand how your money grows when interest is added to both the initial principal and accumulated interest over time. This is one of the most powerful concepts in finance and investing. This calculator is useful for estimating long-term investment growth, comparing compounding frequencies (monthly, yearly, daily), planning savings, retirement, and financial goals, and understanding how interest-on-interest accelerates wealth. It uses the standard compound interest formula and supports multiple currencies and compounding intervals for accurate financial projections.

Formula

A = P \left(1 + \frac{r}{n}\right)^{nt}

How to Use?

Enter your initial investment amount.
Input the annual interest rate.
Select compounding frequency (monthly, yearly, etc.).
Enter the investment duration in years.
View final amount, interest earned, and growth percentage instantly.

Worked Examples

Example: $1,000 at 5% for 10 years

Given:inputs

principal:1000

annualRate:5

compoundFrequency:12

years:10

Result:calculated

amount:1647

interest:647

growth:64.7

Power of Compounding

Compounding allows your investment to grow exponentially over time.

Choosing Frequency

More frequent compounding leads to higher returns.

Table: Compound Interest Growth Examples

Principal	Rate	Time	Compounding	Final Amount
$1,000	5%	10 years	Monthly	$1,647
$5,000	7%	20 years	Annually	$19,348

FAQs

What is compound interest?

It is interest calculated on both principal and accumulated interest.

Does compounding frequency matter?

Yes, more frequent compounding increases total returns.