Compound Interest Calculator
See how an amount grows with compound interest over time, with optional regular contributions.
- Final amount
- 20,096.61
- Total you put in
- 10,000.00
- Interest earned
- 10,096.61
What is Compound Interest Calculator?
Compound interest means you earn interest on your interest. Each time interest is added, the next interest is calculated on a larger amount, so money grows faster and faster over time.
What this tool does
Calculates the final amount from a starting amount, an annual interest rate, a number of years and how often interest is compounded. You can add a contribution each period, and it shows the total you put in and the interest earned.
How to use it
- Enter your starting amount, the yearly rate and the years.
- Choose how often the interest is compounded.
- Add a regular contribution if you save every period, then read the result.
Did you know?
- The Rule of 72 estimates how long money takes to double: divide 72 by the interest rate. At 7 percent, about 10 years.
- More frequent compounding gives slightly more interest, but the rate and the time matter far more.