See what a starting capital, a monthly contribution and an interest rate grow into. Choose monthly or annual compounding and get the end capital, the amount paid in, the interest earned and a yearly table.
| Year | Balance | Paid in | Interest |
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Amounts are rounded to the nearest cent for display. One comma or dot is the decimal separator (1000,50 or 1000.50). Monthly compounding credits interest twelve times a year and each contribution earns interest from the month after it is paid; annual compounding credits interest once a year on the balance at the start of that year. Taxes, fees and inflation are not included — this is a projection, not a promise.
Enter a starting capital, a monthly contribution, an annual interest rate and a term in years, and the calculator shows three figures: the end capital, the total amount paid in and the interest earned. A table below lists the balance, payments and interest at the end of each year — for long terms the first ten years plus the final year. The two compounding options really differ. With monthly compounding interest is credited twelve times a year, and each contribution earns interest from the month after it is paid. With annual compounding interest is credited once a year on the balance at the start of that year, so contributions paid in during the year first earn interest the year after. The rate must be between 0 and 1000 percent; negative rates, taxes, fees and inflation are not included, and the figures are a projection, not a promise. Nothing is uploaded: it runs in your browser.