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Compound Interest Calculator
Watch your savings grow over time.
Future balance
$19,318.14
after 10 years
You contributed
$13,000.00
Interest earned
$6,318.14
About the Compound Interest Calculator
Free compound interest calculator. See how an initial deposit plus regular contributions grow with compound interest over any number of years.
Everything is calculated instantly in your browser — nothing you type is uploaded or stored. Bookmark Calcooly for the next time you need it.
How to use the Compound Interest Calculator
- 1Enter your starting amount and monthly contribution.
- 2Set the annual return rate, number of years and compounding frequency.
- 3See your future balance, total contributions and interest earned.
Frequently asked questions
What is compound interest?+
It's interest earned on both your original money and the interest already added, so your balance grows faster over time.
How does compounding frequency matter?+
More frequent compounding (monthly vs yearly) adds interest sooner, which slightly increases your final balance.
Is the result exact?+
It's a reliable estimate for general information. For important financial, medical or legal decisions, check with a qualified professional.