Compound Interest Calculator
See how your savings grow over time.
About the Compound Interest Calculator
See how your money grows with this free compound interest calculator. Enter a starting amount, annual interest rate, number of years, and how often interest compounds — daily, monthly, or annually — and instantly get the future value of your savings or investment plus the total interest earned. It's the fastest way to understand why starting early matters: interest earns interest, and small monthly contributions snowball over decades. Great for savings accounts, GICs and CDs, and long-term investing.
How to use the Compound Interest Calculator
- 1Enter your starting amount, rate, and years.
- 2Set how often interest compounds per year.
- 3See the future value and interest earned.
Frequently asked questions
What is compound interest?
It's interest earned on both your original amount and the interest already added — so your money grows faster over time.
How often should interest compound?
More frequent compounding (e.g. monthly vs annually) yields slightly more. Many savings accounts compound monthly or daily.
What is the rule of 72?
Divide 72 by your annual return to estimate how many years it takes money to double — at 8%, roughly 9 years.