Compound Interest Calculator

Calculate the future value of your investments using the power of compound interest. Factor in initial deposits, monthly contributions, and compounding frequency.

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Initial Balance ($)

Regular Contribution ($)

Interest Rate (%)

Years to Grow

Compounding Frequency

Future Value

$108,373

Total Interest

$38,373

Total Principal

$70,000

Yield Breakdown

Over 10 years, your investment will grow to $108,373. Out of this total, $70,000 (64.6%) is your hard-earned principal, while $38,373 (35.4%) represents pure compound interest growth.

Growth TrajectoryArea Chart

Unleash the Power of Compound Interest

Albert Einstein purportedly called compound interest the "eighth wonder of the world," stating that those who understand it earn it, and those who do not, pay it. Whether you are forecasting a retirement portfolio, calculating mortgage growth, or measuring wealth accumulation, compound interest is the fundamental mathematical backbone of modern finance. Our calculator allows you to model real-world growth by simulating starting balances, regular cash injections, and flexible compounding frequencies. You can instantly see your geometric growth curve and recognize how massive a difference a few extra years makes on your total yield.

How to use this Compound Interest Calculator?

Starting Balance

Enter the initial amount of money you are investing.

Contributions

Add your regular monthly or annual contributions to the investment.

Interest & Tenure

Input length of time in years and expected interest rate.

Compounding Base

Select how often interest applies (Monthly, Annually, Daily).

Frequently Asked Questions

Compound interest is the interest on a deposit calculated based on both the initial principal and the accumulated interest from previous periods. Put simply, it is "interest on interest", making your wealth grow at an accelerating rate.

The Rule of 72 is a quick mental math shortcut to estimate how long it takes an investment to double in value. Divide 72 by your expected annual interest rate. For example, at a 7% return, your money doubles in roughly 10.2 years (72 ÷ 7).

Yes! The more frequently your money compounds (daily vs annually), the higher the final yield will be. Daily compounding generates slightly more wealth than monthly, which generates more than annual compounding.

If you have the money, investing it earlier is always mathematically better. Therefore, 12 monthly contributions of $100 will slightly outperform a single $1,200 contribution made at the end of the year.

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Unleash the Power of Compound Interest

How to use this Compound Interest Calculator?

Starting Balance

Enter the initial amount of money you are investing.

Contributions

Add your regular monthly or annual contributions to the investment.

Interest & Tenure

Input length of time in years and expected interest rate.

Compounding Base

Select how often interest applies (Monthly, Annually, Daily).

Frequently Asked Questions