Dollar Cost Averaging
You don’t need to time the market perfectly if you never try to time it at all — here’s the strategy that makes that a feature, not a weakness.
What Is It
Dollar cost averaging means investing a fixed dollar amount at regular intervals — every paycheck, every month — regardless of whether prices are up or down, rather than investing a lump sum all at once. If you contribute to a 401(k) from every paycheck, you’re already doing this without having named it.
Why It Matters
It removes the guessing game of trying to pick the “right” time to invest, which even professional fund managers consistently fail to do. Because you’re buying on a fixed schedule, you automatically buy more shares when prices dip and fewer when prices rise — a built-in form of discipline that doesn’t depend on predicting anything.
Quick Example
Say you invest $500 a month for four months while the price bounces between $8 and $12 a share. Instead of guessing when to buy, DCA buys more shares when the price dips and fewer when it rises — in this example, that discipline nets you about 204 shares for your $2,000, compared to 200 shares if you’d put it all in during the first month at $10. Small in this example, but the same mechanic works whether the market swings for four months or forty years.
See how that plays out over a longer stretch, and how it changes depending on what the market actually does — test dollar cost averaging against a lump sum of the same amount across a bear, normal, or bull market below.
Try It Yourself
The real payoff of investing consistently, month after month, isn’t really about timing the market — it’s about giving compound growth as many years as possible to work. See what your own regular contributions could grow into over time.
📈Compound Interest Calculator
Model what consistent monthly investing grows into over time — the real engine behind long-term wealth building.