savings
Compound Interest Calculator
See how your money grows.
Calculate compound interest on an investment or savings amount over time.
Compound Growth
See your final balance and total interest earned.
Flexible Frequency
Annually, semi-annually, quarterly, monthly, or daily.
Free & Unlimited
No signup, no watermarks, no limits. Use it as many times as you like.
What is a Compound Interest Calculator?
A compound interest calculator shows how an investment or savings balance grows when interest is earned not just on the original principal, but also on interest already added to the balance. The more frequently interest compounds, the faster the balance grows.
How to use this calculator
- Enter your principal (starting) amount.
- Enter the annual interest rate as a percentage.
- Enter the number of years.
- Choose how often interest compounds, then click Calculate.
Frequently Asked Questions
Compound interest is interest calculated on both the original principal and the interest already earned, so your balance grows faster over time than with simple interest.
It's how often interest is added to your balance each year. More frequent compounding (like monthly or daily instead of annually) results in slightly higher returns for the same interest rate.
Yes. 100% free — no account required, no watermarks, no usage limits.