Compound interest
calculator.
See how your money grows over time. Adjust the sliders to match your situation — the chart updates instantly.
Your inputs
The lump sum you start with today
How much you add each month
S&P 500 historic avg ~10%, balanced fund ~6–7%
Compounding frequency
This calculator is for educational purposes only and does not constitute financial advice. Actual returns will vary. Book a free call to discuss your real situation.
Final balance
$219,269
21.9× your money
Total contributed
$70,000
Your out-of-pocket
Interest earned
$149,269
Free money from time
Interest share
68%
of final balance
Growth over 25 years
Each bar shows total balance split between what you put in and what the market added
Time is everything
What a decade makes
See how starting 10 years earlier or later changes your outcome — using your exact numbers.
Start 10 years earlier (35 yrs)
$475,272
after 35 years
Your current plan
$219,269
after 25 years
Start 10 years later (15 yrs)
$91,882
after 15 years