Compound Interest Calculator
See exactly how your savings snowball over time. Enter a starting amount, what you add each month, your rate, and how long you’ll invest — the chart updates instantly.
Your numbers
Your results
$0
Future balance
$0
You put in
$0
Interest earned
Balance
Contributions
Interest
Show year-by-year breakdown
| Period | Added | Interest | Balance |
|---|
Formula: standard compound-interest math. Figures are estimates, not financial advice.
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How compound interest works
Compound interest is interest earned on both your original money and the interest it has already earned. The longer you leave it, the faster it grows — which is why starting early matters more than the amount.