Compound Interest Calculator
Calculate compound interest with regular contributions, any compounding frequency, and inflation-adjusted results. Year-by-year table and growth chart included.
Investment details
Result
Interest is added on the contribution schedule, so a compounding frequency that differs from the deposit frequency is converted exactly.
Growth
Year by year
| Year | Contributions | Interest | Balance |
|---|---|---|---|
| 1 | 0.00 | 511.62 | 10,511.62 |
| 2 | 0.00 | 537.79 | 11,049.41 |
| 3 | 0.00 | 565.31 | 11,614.72 |
| 4 | 0.00 | 594.23 | 12,208.95 |
| 5 | 0.00 | 624.63 | 12,833.59 |
| 6 | 0.00 | 656.59 | 13,490.18 |
| 7 | 0.00 | 690.18 | 14,180.36 |
| 8 | 0.00 | 725.49 | 14,905.85 |
| 9 | 0.00 | 762.61 | 15,668.47 |
| 10 | 0.00 | 801.63 | 16,470.09 |
How to use
- Enter the initial amount, the annual interest rate and the term in years and months.
- Pick a compound frequency — daily, monthly, quarterly, annually or continuously.
- Add a contribution amount and frequency, and set its timing to end or beginning of period.
- Enter an inflation rate to also get the balance in today’s money, or leave it empty.
- Read the final balance and total interest, then use Copy table or Download CSV for the years.
FAQ
What is the compound interest formula?
FV = P × (1 + r/n)^(n×t). With regular deposits add PMT × ((1+i)^N − 1) / i, where i = r/n and N = n×t.
Does compounding frequency really matter?
Yes, but less than people expect. $10,000 at 5% for 10 years grows to $16,288.95 compounded annually and $16,470.09 compounded monthly — about $181 more.
Should deposits be at the beginning or end of the period?
Beginning-of-period deposits (an annuity due) earn one extra period of interest each time, so they always finish higher: $1,000 at 8% for 20 years with $200/year ends at $13,813.35 (end) vs $14,545.54 (beginning).
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