Compound Interest Calculator
See how your investments grow over time with compound interest and regular contributions.
Year-by-Year Breakdown
| Year | Contributions | Interest | Balance |
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How Compound Interest Works
Compound interest is interest earned on both the initial principal and on previously earned interest. The formula for compound interest is:
A = P(1 + r/n)^(nt)
Where A is the final amount, P is the principal, r is the annual interest rate, n is the number of times interest is compounded per year, and t is the number of years.
When you add regular monthly contributions, the future value of an annuity formula is also applied. This calculator combines both formulas to give you the total growth including all contributions and compound interest.
The earlier you start investing, the more you benefit from compound interest. Even small monthly contributions can grow significantly over decades.