What Is Dollar-Cost Averaging?
A simple habit that solves the hardest psychological problem in investing: deciding when to buy.
The definition
Dollar-cost averaging (DCA) means investing a fixed amount on a regular schedule — say $100 on the first of every month — regardless of what the market is doing.
You don't wait for a dip. You don't wait for confirmation. You don't wait until things "calm down." You just buy on schedule.
What it actually does for you
1. It buys more when prices are low
Because your dollar amount is fixed, the number of shares you get varies automatically:
| Month | Share price | $100 buys |
|---|---|---|
| January | $50 | 2.00 shares |
| February | $40 | 2.50 shares |
| March | $25 | 4.00 shares |
| April | $50 | 2.00 shares |
You bought the most shares when the price was lowest — without predicting anything. Your average cost per share ends up below the simple average of those prices.
2. It removes the timing decision
This is the bigger benefit. Trying to time the market means being right twice: when to get out and when to get back in. Most people, including professionals, do this badly. DCA makes the decision once and then removes it from your hands.
3. It makes investing a habit rather than an event
Automated monthly contributions turn investing into something that happens whether or not you feel confident that month. That consistency is what makes compounding work.
Where you've likely already done this: if you contribute to a 401(k) through payroll, you're dollar-cost averaging automatically. Same money, same schedule, every paycheck.
The honest counterpoint
Here's what most articles about DCA leave out. If you have a lump sum available today — say you inherited $20,000 — research has generally found that investing it all at once has historically outperformed spreading it out, simply because markets rise more often than they fall, so being invested sooner tends to win on average.
So why does DCA still get recommended constantly?
- Most people don't have a lump sum. They have a paycheck. DCA is just what investing looks like when your money arrives monthly.
- It reduces regret risk. Dumping your savings in the day before a 30% crash is psychologically devastating, and people who experience that often abandon investing entirely. DCA trades a bit of expected return for a much smoother emotional ride.
- The best strategy is the one you'll actually stick to. A slightly suboptimal plan you follow for 20 years beats an optimal plan you abandon in year two.
How to set it up
- Pick an amount you can sustain in a bad month, not just a good one
- Pick a date — right after payday works well
- Automate the transfer and the purchase so it happens without you
- Choose something broad, like an index ETF, so you're not also making a stock-picking decision each month
- Increase the amount when your income rises, not your spending
The one rule that matters most: don't stop during downturns. That's precisely when your fixed contribution is buying the most shares. Investors who paused contributions during major crashes often missed the recoveries that followed.
Model it before you commit
StockCraft's free DCA and compound growth calculators let you test different amounts and time horizons.
Open the free tools →