Compound Interest Calculator
See how your savings grow with compound interest over time.
Result
Results are estimates for general information only and are not professional advice.
What is compound interest?
Compound interest is interest earned on both your original deposit and on the interest that has already been added to it. Unlike simple interest, which is paid only on the principal, compounding lets your balance grow at an accelerating pace — which is why it is often called the most powerful force in saving and investing.
The formula behind it
The future balance is A = P(1 + r/n)^(nt), where P is the initial amount, r is the annual rate, n is how many times interest is compounded per year and t is the number of years. The more frequently interest compounds — yearly, quarterly, monthly or daily — the faster the balance grows.
How to use this calculator
Enter your initial amount, the annual interest rate, the number of years and how often interest compounds, then press Calculate. You will see the final balance and the total interest earned, so you can compare savings accounts or project long-term growth.
Making compounding work for you
Time is the biggest lever: the earlier you start, the more the exponential effect rewards you. Adding regular contributions and choosing accounts that compound more often both boost the final result. Even a modest rate can turn small, consistent deposits into a substantial sum over decades.
Frequently Asked Questions
What is the Compound Interest Calculator?
See how your savings grow with compound interest over time. It runs instantly in your browser and is completely free to use.
What do I need to enter to use the Compound Interest Calculator?
The Compound Interest Calculator asks for the following values (4): Initial amount, Annual rate (%), Years, Compounding. Fill them in and the result appears immediately — the calculation runs on your own device, so nothing you type is sent to a server.
How accurate is the Compound Interest Calculator?
The Compound Interest Calculator uses standard, widely-accepted formulas, so its figures are reliable estimates for everyday planning. They are not a substitute for advice from a qualified professional.
Is the Compound Interest Calculator free, and do I need an account?
Yes. The Compound Interest Calculator — and every other calculator on Calculatis — is completely free, with no registration, no download and no limit on how often you use it.