Dollar-Cost Averaging Calculator
Last updated July 2, 2026
Last reviewed July 8, 2026
Dollar-cost averaging (DCA) is the practice of investing a fixed dollar amount at regular intervals — weekly, biweekly, or monthly — regardless of current market prices. It's the investment strategy most people follow without necessarily naming it, since 401(k) contributions happen automatically on each paycheck. DCA's financial advantage is that it purchases more shares when prices are low and fewer when prices are high, producing an average cost per share that is lower than the average price per share over the same period. This "buying the dip" effect is automatic and requires no market timing.
The research on DCA versus lump-sum investing shows that lump-sum investing outperforms DCA approximately two-thirds of the time in markets that generally trend upward, since the full sum benefits from compound growth for the entire period rather than being phased in gradually. However, DCA can compare more favorably during periods of high volatility or declining markets, and — critically — it's often more behaviorally sustainable. Most investors who receive a windfall and attempt lump-sum investing experience heightened anxiety about timing and often end up holding cash waiting for a dip that may not arrive. For investors who can commit to a DCA schedule and never miss a contribution regardless of market conditions, DCA captures the behavioral benefit of consistency while still depending on uncertain market returns.
Modeling your regular investment contribution — 401(k) deferrals, IRA contributions, taxable account transfers — as a DCA strategy in the calculator. Project the total accumulated at your expected retirement date across multiple return scenarios. The key insight DCA calculators reliably produce is that the contribution amount and consistency matter far more than the starting market conditions, reinforcing the value of starting and continuing regardless of market timing concerns.