How much could monthly US-stock investing grow into over time — run the numbers yourselfDCA future-value calculator: monthly amount + years + an assumed annual return
Dollar-cost averaging means putting in a fixed amount at set intervals, regardless of whether prices are high or low. Its real point isn't "calling the market right" — it's tying long-term compounding to discipline. The illustrative calculator below lets you enter how much you put in each month, how many years you plan to keep it up, and an assumed annual return, then shows roughly what the end value, the principal you actually contributed, and the gap between the two might look like. The return is an assumption, not a promise — real markets rise and fall, and you can lose money.
Estimated from your monthly amount, monthly compounding and a fixed annual return — and that return is just the assumption you typed in. Real markets rise and fall, may trail this over the long run or even lose money, and this tool makes no promise of returns and is not investment advice. Fees, taxes, inflation and exchange rates are not included. This tool is offline and pulls no live data.
01What this calculator is actually computing
It assumes you put in a fixed amount every month for a set number of years, and applies monthly compounding at the annual return you give. Add up each contribution's compounded value at the end, and you get the "estimated end value"; the money you actually put in (monthly amount × number of months, plus the starting amount) is your "total contributions"; the difference between the two is the part that compounding "grew" over that stretch. The larger the amounts, the longer the horizon and the higher the return, the more the growth portion stands out — which is exactly why long-term DCA gets emphasized so often.
02Why the return can only be an assumption, never a promise
The return in the calculator is a smooth straight line, but real markets are never a straight line: there are big years, flat years, and stretches of consecutive declines. Using the long-run average of a broad index as a reference point is fine, but treating it as a return you're "sure to get in the future" is planting a landmine for yourself. By the same logic, don't crank up leverage or bet your emergency fund just because the numbers look good. The market may sit at a low exactly when you most need the cash — which is why DCA stresses using "spare money" and "money you won't touch for a long time".
03What it doesn't count (don't treat it as the whole picture)
To keep the main thread clear, this estimator excludes: trading and platform fees, the withholding tax on dividends, inflation (a dollar buys less in ten years), currency moves, and — most importantly — the real ups and downs of prices. It answers "under one idealized assumption, roughly how principal and compounding grow", not "is this investment worth it" or "should I buy now".
04How to actually use it for judgment
The most useful move is to flex the inputs and watch the sensitivity: bump the return from 4% to 8% and see how far the end value shifts — you'll feel first-hand how much weight the "return assumption" carries, which makes you warier of any "high-return promise"; then stretch the number of years to see what time alone does. Once you grasp the logic of long-term DCA, the next step is to figure out where to buy, how to get money in, and how much each trade costs you — read on with the four funding routes and how buying stocks inside a platform differs from a broker.
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This tool is for education only; the result is based on the idealized assumption of a fixed annual return, does not represent real returns, and is not investment advice or a promise of returns. Last updated 2026-07-03.