Free tool · nothing is uploaded
Free compound interest calculator
Enter a starting amount, a yearly interest percent, how many years it compounds, and how many times a year. This page shows the future amount and the interest earned. The numbers stay in your browser.
The numbers stay in this browser.
How the interest is calculated
- The rate for each period is the yearly percent divided by the compounds per year. Compounded yearly, 5% is used once a year.
- The future amount is the starting amount times (1 + yearly rate divided by compounds per year), raised to compounds times years. 1000 at 5% a year, compounded yearly for 10 years, is shown as 1628.89.
- The same 1000 at 5% for 1 year, compounded yearly, is 1050. Compounded monthly, the yearly rate is divided by 12.
- Interest earned is the future amount minus the starting amount.
- The starting amount can be 0 or more. The percent can be 0 to 100. Years can be greater than 0 and up to 100. Compounding can be 1 to 365 times a year. Amounts are shown to 2 decimal places. A comma is a thousands separator, so 1,000 is 1000.
Extra deposits are not included. Taxes and fees are not added. Daily compounding uses 365 periods a year. This page uses the standard formula and does not fetch a bank quote.
Questions about this calculator
How is compound interest calculated?
The future amount is the starting amount times (1 + yearly rate divided by compounds per year), raised to compounds times years. 1000 at 5% a year, compounded yearly for 10 years, is shown as 1628.89.
What if it compounds monthly?
The yearly rate is divided by 12, and there are 12 compounds in each year. Daily compounding uses 365 periods a year.
Are extra deposits included?
No. This compounds the starting amount only. Extra deposits, taxes, and fees are not added.
Does this tool upload the numbers?
No. The numbers stay in the browser. Blogoose does not receive them.