FINANCIAL CALCULATOR
Compound Interest Calculator
Calculate how your money can grow with compound interest. Estimate your future balance, total contributions, and interest earned over time.
Investment breakdown
This calculator provides an estimate based on the information entered. Actual investment returns may vary and are not guaranteed.
How to Use the Compound Interest Calculator
Enter your initial investment, monthly contribution, expected annual interest rate, investment period, and compounding frequency. The calculator estimates how much your investment could grow over time.
What Is Compound Interest?
Compound interest is interest earned on both the original amount of money and the interest that has already been added to the account. Over longer periods, this can significantly increase the growth of an investment.
What Does This Calculator Show?
- Estimated future balance
- Total money contributed
- Total interest earned
- Starting investment
- Additional monthly contributions
Compound Interest Formula
For a basic compound interest calculation, the future value can be represented as:
A = P(1 + r/n)^(nt)
In this formula, A is the future value, P is the initial principal, r is the annual interest rate expressed as a decimal, n is the number of compounding periods per year, and t is the number of years.
Compound Interest Example
Suppose you start with $10,000, contribute $200 each month, and earn an average annual return of 7% for 10 years. The calculator can estimate how much the account could be worth and how much of the final balance comes from your contributions versus interest.
Investment returns are not guaranteed. Actual results depend on the investment, market performance, fees, taxes, contribution timing, and other factors.
Frequently Asked Questions
What is the difference between simple and compound interest?
Simple interest is calculated only on the original principal, while compound interest allows previously earned interest to generate additional interest.
How does compounding frequency affect growth?
More frequent compounding can increase the amount of interest earned, assuming the same stated annual rate and other conditions.
Does this calculator guarantee investment returns?
No. The calculator provides an estimate based on the assumptions entered. Actual investment returns can be higher or lower.
Why do regular contributions matter?
Regular contributions add more money to the investment over time, giving that additional money an opportunity to earn returns as well.