Final balance, interest earned, inflation-adjusted value & scenario comparison — all in one place.
| Metric | 5 Yrs | 10 Yrs | 15 Yrs | 20 Yrs | 30 Yrs |
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| Year | Starting Balance | Contributions | Interest Earned | Ending Balance |
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This advanced compound interest calculator gives you a complete picture of your investment growth. Beyond just a final number, you can see how contributions accelerate growth, how inflation erodes purchasing power, and how different time horizons compare side by side.
Regular contributions dramatically amplify compound growth. For example, investing $10,000 at 8% for 20 years yields ~$49,300. But adding just $200/month turns that into ~$167,000 — over 3.3× more. The longer the period, the more dramatic the difference becomes.
The more frequently interest compounds, the faster your money grows. Daily compounding yields slightly more than monthly, which beats quarterly. At 8% annual rate: monthly compounding yields ~8.30% effective annual rate, while daily compounding yields ~8.33%. The difference is small but compounds meaningfully over decades.
A million dollars in 20 years is not the same as a million dollars today. At 3% inflation, that future million has roughly the purchasing power of about $554,000 today. Always consider the real rate of return — your nominal rate minus inflation — when evaluating long-term investment goals.