Compound Interest Calculator
100% PrivateCalculatorsProject how savings or investments grow when interest earns interest over time.
Runs entirely in your browser. Your input is not uploaded to Ovatly or anywhere else.
| End of year | Balance |
|---|---|
| 1 | 10,500.00 |
| 2 | 11,025.00 |
| 3 | 11,576.25 |
| 4 | 12,155.06 |
| 5 | 12,762.82 |
| 6 | 13,400.96 |
| 7 | 14,071.00 |
| 8 | 14,774.55 |
| 9 | 15,513.28 |
| 10 | 16,288.95 |
Contributions are added at the end of each compounding period. This is a projection at a fixed rate, not a promise: real returns vary and taxes and fees are not included.
- 1Enter the starting amount and the annual interest rate.
- 2Enter the number of years and choose how often interest compounds.
- 3Optionally add a monthly contribution.
- 4Read the final value, what you put in, the interest earned, and the yearly table.
The final value is 16,288.95, of which 6,288.95 is interest, from A = 10,000 x 1.05^10. Compound the same money monthly instead and the result rises slightly to 16,470.09, which is the compounding frequency effect in action.
- Contributions are modeled at the end of each compounding period (for monthly compounding, that is the full monthly amount each month).
- The projection assumes a fixed rate with no taxes, fees or withdrawals. Real investment returns vary year by year.
- Daily compounding uses 365 periods a year.
A = P(1 + r/n)^(nt): principal P, annual rate r as a decimal, n compounding periods per year, t years. Contributions add a standard annuity term on top.
About this tool
The Compound Interest Calculator projects how savings or investments grow when interest earns interest, with your choice of compounding frequency and an optional monthly contribution. A year-by-year table shows the growth curve in numbers, so the long-term effect of rate, time and contributions is easy to compare.
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