Compounding means that a gain or loss is applied to a balance that already includes earlier gains, losses, and contributions. The mathematics makes time and regular contributions visible, but it does not predict a real investment result.
Three inputs matter
A calculation needs a starting amount, a recurring contribution, and an assumed rate over a chosen period. Changing any one can materially change the illustration. Fees, taxes, inflation, and irregular deposits can make a real result different.
Sequence matters in real life
Markets do not grow at the same rate each month. Two investments with the same average return can produce different results when the order of gains and losses differs, especially while money is being added or withdrawn.
Use an assumption, not a prediction
Use the compound returns calculator to understand the formula at several assumptions. It does not tell you what to invest in or guarantee any future value.
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