← All Tools
Compound Interest Calculator
See how your money grows over time with compound interest, regular contributions, and inflation adjustment. Includes the Rule of 72, EAR, and what-if comparisons.
Investment Details
$
7%
Contributions & Inflation optional
$
Added at the start of each month
%
Leave at 0 to skip inflation adjustment
72
Rule of 72
At 7% annual return, your money doubles every 10.3 years.
Formula: 72 ÷ interest rate = years to double
Final Balance
--
After -- of compounding
Total Contributions
--
Total Interest Earned
--
Real Value (Inflation-Adj.)
--
Effective Annual Rate
--
Balance Over Time
Contributions vs. interest grown — stacked area
Year-by-Year Breakdown
| Year | Balance | Interest (Yr) | Total Contrib. | Total Interest |
|---|
What-If Comparison
See how small changes compound dramatically over time.
Your Scenario
--
Base
5 Yrs Earlier
--
--
+1% Rate
--
--
All scenarios use same compounding frequency and monthly contributions.