What Is Dollar-Cost Averaging? (2026)

Dollar-cost averaging (DCA) is investing a fixed amount of money at regular intervals, every paycheck or every month, regardless of whether prices are up or down. Instead of trying to time the market, you invest the same amount on a schedule. When prices are low your money buys more shares; when prices are high it buys fewer. Over time this smooths out your average cost and takes the emotion (and guesswork) out of investing.

A simple example

Say you invest $200 a month in an index fund:

Month	Share price	Shares bought
1	$20	10
2	$16	12.5
3	$25	8

You invested $600 and bought 30.5 shares, an average cost of about $19.67 per share, even though the price bounced between $16 and $25. You automatically bought more when it was cheap and less when it was pricey, without predicting anything.

Why it works

Removes timing risk. You never have to guess the “right” moment to invest, a guess even professionals get wrong.
Removes emotion. A fixed schedule keeps you investing through scary downturns, which is exactly when shares are on sale.
It is automatic. Set it up once and it runs on its own.

You may already be doing it

If you contribute to a 401(k) every paycheck, you are dollar-cost averaging by default, buying the same dollar amount of funds on a regular schedule. It is the most common (and effortless) way Americans invest.

DCA vs. lump-sum investing

If you have a large amount to invest at once (say, a bonus or inheritance), research shows that investing it all immediately (lump sum) beats spreading it out about two-thirds of the time, simply because markets rise more often than they fall, so money invested sooner has more time to grow.

So why use DCA? Two reasons:

You are investing from income, not a lump sum, in which case DCA is just how regular investing works.
Peace of mind. Spreading out a big sum can reduce the regret and anxiety of investing right before a drop, even if the math slightly favors lump-sum.

Bottom line

DCA = investing a fixed amount on a regular schedule, regardless of price.
It lowers timing risk and removes emotion, and you are likely already doing it in your 401(k).
For a one-time lump sum, investing it all at once usually wins, but DCA can be the calmer choice.

See how steady, scheduled investing compounds with our interest calculator and 401(k) calculator. This article is general information, not investment advice.