Enter what you have today, what you add each month, a yearly return and the number of years. The calculator shows the final balance and splits it into what you paid in and what compounding added.
How the calculation works
Growth is added every month at one twelfth of the yearly rate, and your monthly saving is added at the end of each month. The return you type is an assumption, not a promise: real markets go up and down from year to year, and a long-run stock-market average is not a guaranteed yearly rate.
FAQ
What return should I use?
Use a conservative number. Savings accounts pay what your bank shows today; for a stock fund, many people test several values (for example 4%, 6% and 8%) to see a range instead of one answer.
Does it include inflation and taxes?
No. To see the result in today’s money, subtract an inflation guess from the return (for example 6% return minus 3% inflation = 3%). Taxes depend on your country and account type.
Why does the growth part get bigger later?
Because growth is earned on earlier growth. In the last years the balance is largest, so each year’s growth is largest too. Time in the market matters more than the exact rate.