Compound Interest Calculator
Enter your starting amount, regular contributions, and expected return — and see exactly how your money grows year by year. Adjust the sliders to see compound interest in action.
Your Investment Details
How much are you investing today?
$200/mo = $2,400/yr
7% = conservative real return
How often interest compounds
Final Balance
$108,224
after 20 years
Total Contributions
$49,000
principal + deposits
Interest Earned
$59,224
free growth from compounding
Interest as % of Total
55%
of ending balance is pure growth
💡 55% of your ending balance is money you never had to earn. That's compound interest — your gains earning gains, year after year.
Growth Over Time
Your Money Doubles
at year 1
Rule of 72 ≈ 11 yrs
Milestone
Year 4
Reaches $10,000
Monthly Equivalent
$200/mo
grows to $108,224 total
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