The Power of Compound Interest Calculator
(Basic Version)
Enter the age you want person A and person B to start and end. Adjust the interest rate and $ amount invested per year. See the difference investing early makes when it comes to compounding interest. See what happens when Person A starts investing at 22 (and continues investing through age 67), while Person B invests the same amount per year but waits to start investing till age 30.
The Power of Compound Interest Calculator
(Advanced Version)
This calculator adds the ability to adjust investment per individual year, remove specific investment years, and adjust more finely. Try seeing what happens when Person A invests only for a few years in the beginning, such as from age 22 to age 32, compared to when Person B invests the same amount per year but only from age 32 onwards (investing 3x as much and 3x as long).