Compound Interest Calculator
Project your investment growth with initial deposit, monthly contributions, and compounding frequency.
Yearly Breakdown — First 10 Years
| Year | Principal | Interest Earned | Total Balance |
|---|---|---|---|
| 1 | $16,000 | -$9,081 | $16,919 |
| 2 | $6,000 | $1,419 | $24,339 |
| 3 | $6,000 | $1,956 | $32,294 |
| 4 | $6,000 | $2,531 | $40,825 |
| 5 | $6,000 | $3,148 | $49,973 |
| 6 | $6,000 | $3,809 | $59,782 |
| 7 | $6,000 | $4,518 | $70,299 |
| 8 | $6,000 | $5,278 | $81,578 |
| 9 | $6,000 | $6,094 | $93,671 |
| 10 | $6,000 | $6,968 | $106,639 |
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How this compound interest calculator works
This compound interest calculator projects the future value of an investment using the standard compound-interest-with-contributions formula: A = P(1 + r/n)nt + PMT × [((1 + r/n)nt − 1) / (r/n)], where P is your Initial Principal, r is the annual interest rate, n is the number of compounding periods per year, t is the time horizon in years, and PMT is the contribution made each compounding period. Your monthly contribution is automatically converted to match the Compounding Frequency you select, so the math stays accurate whether you compound daily, monthly, quarterly, or annually. When Daily is selected, n is set to 365 compounding periods per year.
Because this investment growth calculator uses a closed-form formula rather than a per-period loop, switching to Daily compounding (n = 365) recalculates instantly without runtime errors, even over long horizons. The resulting Annual Percentage Yield (APY) rises with more frequent compounding, so you can compare Daily, Monthly, Quarterly, and Annually side by side to see how compounding frequency affects your total balance.
Tips for growing your investment
- Start early — the longer your money compounds, the more dramatic the growth, thanks to interest earning interest.
- Even small increases in your monthly contribution can add up to tens of thousands over decades.
- More frequent compounding (daily or monthly vs. annually) boosts returns, especially over long horizons.
- Reinvest dividends and interest rather than withdrawing them to keep the compounding cycle intact.
- Remember these are nominal figures — subtract 2–3% for an inflation-adjusted (real) estimate.
Looking to invest your accumulated wealth into real estate? Calculate your potential home loan payments with our Mortgage Calculator.