Compound Interest Calculator
Albert Einstein reportedly called compound interest the "eighth wonder of the world." Use this calculator to see exactly how your money can exponentially grow over time.
After X years, your investment will be worth...
Wealth Growth Over Time
Principal InterestThe Compound Interest Formula
This calculator uses standard continuous compounding formulas to evaluate both your initial deposit and your recurring monthly deposits. The SEC investor.gov compound interest calculator demonstrates how even small consistent contributions can grow significantly over decades. For example, $5,000 invested at 8% annual return compounded monthly becomes $24,647 in 20 years. This is why financial advisors emphasize starting early: a 25-year-old investing $200 per month at 7% will accumulate $525,000 by age 65, while a 35-year-old doing the same accumulates only $243,000.
r = Rate | n = Compounds per year | t = Years
Note: When compounds are set to Daily (n=365) but contributions are Monthly, the calculator standardizes contributions to end-of-month payments, which is standard financial modeling practice.
