Dollar-Cost Averaging Explained (with Example)

Dollar-cost averaging (DCA) is the practice of investing a fixed amount of money at regular intervals, regardless of the price. Because the same amount buys more shares when prices are low and fewer when they are high, it lowers your average cost per share and removes the temptation to time the market.

How it works

The mechanics are deliberately simple: you commit to a fixed sum on a fixed schedule, say, the first of every month, and you invest it whatever the market is doing. When prices fall, that fixed sum automatically buys more shares; when prices rise, it buys fewer. Over time this tilts your overall purchase toward the cheaper periods, which is why your average cost can end up below the average price.

Worked example. Invest $300 a month. At $30 a share you buy 10; at $20 you buy 15; at $25 you buy 12. Over three months you invested $900 for 37 shares, an average cost of $24.32, below the simple average price of $25.

The gap between your $24.32 average cost and the $25 simple average is the whole point: you bought the most when the price was lowest. That advantage grows the more prices swing around, and it requires no forecasting at all, you never had to guess which month was the bottom.

The real benefit is behavioural

DCA's biggest advantage is not mathematical but psychological. It turns investing into an automatic habit, removes emotion from the decision, and keeps you buying through downturns, exactly when the best long-term prices appear.

Most investors lose money not because they pick the wrong assets but because they hesitate, sell in a panic, or wait for a "better moment" that never comes. A fixed schedule sidesteps all of that by making the decision in advance. It is the same discipline that powers a systematic investment plan, where a regular salary is fed into the market month after month, and it relies on the quiet power of compound interest doing its work over years.

The trade-off

If markets are rising, investing everything at once would usually have earned more. DCA trades a little expected return for a lot less stress and timing risk, a trade most long-term investors are happy to make.

The reason is straightforward: markets rise more often than they fall, so money kept on the sidelines waiting to be drip-fed in tends to miss some of that climb. Lump-sum investing wins on average, but it also concentrates the risk of buying right before a drop. DCA is the more comfortable choice when you are investing a salary as it arrives, or when a single bad entry point would shake your nerve enough to abandon the plan entirely.

Written by

Federico Romaldi

Co-Founder, Worthmap

Published: June 6, 2026

Federico is a co-founder of Worthmap, a wealth-intelligence platform built for serious investors. With a background in software engineering and a long-standing passion for value investing, he created Worthmap to bridge the gap between net-worth tracking and investment analysis.