Project how savings or investments grow over time with compound interest and regular contributions.
Informational only — not financial advice. This calculator provides general estimates for educational purposes and does not account for every factor in your situation. It is not financial, investment, tax, or legal advice. Figures are estimates and may not reflect current rates. Consult a qualified professional before making financial decisions.
Compound interest is interest earning interest: each period's growth is added to your balance, so the next period grows on a bigger base. Over long horizons this snowballs, which is why starting early and contributing regularly matters far more than picking a slightly higher return.
This calculator uses A = P(1+i)N + PMT × [((1+i)N−1)/i] with monthly compounding and a monthly contribution, where i is the periodic rate and N the number of periods. It's ideal for planning retirement savings, a brokerage account, or a high-yield savings goal.
Because growth compounds, the earliest dollars you invest do the most work. Delaying contributions by even a few years can cost a large share of your final balance. Note that this is a projection at a fixed assumed return — actual markets fluctuate, and past performance doesn't guarantee future results.