What drives the result
Time, contribution amount, return assumptions, and contribution increases usually drive the biggest changes. Small monthly changes can compound into large differences over long periods.
Compound Interest Calculator
Compound Interest Calculator
Watch compound growth do the heavy lifting. See how consistent investing and time can change long-term wealth outcomes.
Free to use
No account required
Private by default
Educational estimates only
Compound growth projection
Your compound growth projection
Here's how your balance may build when contributions and prior gains keep working over time.
Future value
$0
$0 in today's dollars
Total contributed$0
Compound growth$0
Final annual contribution$0
Contributed
Growth
Goal timing
Goal timingNot reached
What this means
Time and contribution consistency usually drive most of the result.
How this calculator works
How compound growth is calculated
The calculator grows your starting balance, adds recurring contributions, and applies your annual return assumption over the selected time period. Advanced inputs let you model annual contribution increases and inflation-adjusted value.
What to do next
Compare your current habit with a slightly higher contribution. Then test a lower return assumption to see whether the plan still feels durable.
Compound interest FAQ
Common compound growth questions
What is compound interest?
Compound interest is growth earned on both your original balance and prior accumulated growth.
Why does time matter so much?
More time gives compounding more years to build on itself, which can significantly increase long-term results.
These calculators are for educational purposes only and are not financial, investment, tax, or legal advice. Results are estimates based on the assumptions provided.