Compound Interest Calculator
NerdWallet-Style · Free · Instant Results
Enter your numbers below and see exactly how your money grows — with a visual chart and year-by-year breakdown.
Your Numbers
Initial Investment
$10,000
$
Monthly Contribution
$200
$
Annual Interest Rate
7%
Time Period
20 years
Compounding Frequency
Your results will appear here
Adjust the inputs on the left and click Calculate to see how your money grows over time.
Growth Over Time
Year-by-Year Breakdown
| Year | Balance | Interest Earned | Total Contributed |
|---|
How to Get More From Compound Interest
1
Start as early as possible. Every decade you wait roughly halves your final balance. The math heavily rewards early starters.
2
Maximize your rate. Move savings from a 0.5% bank account to a 4.8% high-yield savings account today — it’s FDIC insured and free to open.
3
Automate monthly contributions. Set an auto-transfer on payday. Even $100/month at 7% for 30 years = over $117,000 in interest alone.
4
Never withdraw. Every dollar you pull out stops compounding permanently. The Rule of 72: at 7%, money doubles every ~10 years.