About the Compound Interest Calculator
Compound interest is the engine of long-term wealth: at a 7% annual return, money roughly doubles every 10 years, and the majority of a 30-year saver's final balance comes from interest, not deposits. The best way to feel that is to move the sliders and numbers yourself.
This calculator converts your nominal annual rate into an equivalent monthly rate based on the compounding frequency you choose, adds your deposit every month, and tracks the balance year by year so you can see exactly when interest starts doing the heavy lifting.