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Calculate compound growth with monthly contributions.
The Compound Interest Calculator is a financial modeling utility designed to forecast wealth accumulation, retirement savings, and investment returns over time. Using the standard compound interest formula with periodic contributions, it models portfolio growth across annual, semi-annual, quarterly, monthly, or daily compounding intervals.
Compound interest is interest calculated on the initial principal plus all previously accumulated interest from past periods, allowing wealth to grow exponentially over time.
More frequent compounding intervals (such as daily or monthly versus annually) generate slightly higher returns because interest begins generating its own interest sooner.
The Rule of 72 is a quick estimation formula: divide 72 by your annual interest rate to determine approximately how many years it will take to double your investment.
This calculator displays nominal investment returns. To estimate real returns after inflation, you can subtract your estimated inflation rate (e.g., 2-3%) from your expected interest rate.
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