DCA Calculator

Dollar-cost averaging (DCA) means investing a fixed amount on a regular schedule regardless of market price. When prices are high, your fixed dollar amount buys fewer shares; when prices are low, you buy more. Over time, this can reduce the impact of bad timing compared to investing one lump sum on a single day — though lump-sum investing has historically outperformed DCA on average in rising markets.

This calculator simulates monthly contributions growing at a smooth assumed annual return. Real DCA into stocks or funds means buying at volatile prices each month; your average cost per share depends on the actual price path, not a straight-line growth curve. Use it to visualize how consistent investing plus compound growth might build a portfolio, not to predict exact balances.

Example: $500/month for 36 months ($18,000 invested) at an assumed 8% annual return might grow to roughly $20,500 in this smooth model — about $2,500 in hypothetical gains. Actual results vary with market swings, fees, and whether you skip months. Hypothetical only; not investment advice.

Psychological benefit is real even when average returns lag lump-sum. DCA spreads entry across months, reducing regret if the market drops right after you start. Many 401(k) plans DCA automatically via payroll.

Lump-sum historically wins in upward-trending markets because more dollars are invested early. DCA keeps cash uninvested longer — a drag when markets rise steadily, a cushion when they fall first.

This smooth-return model hides volatility. A real 36-month path might include a −20% drawdown mid-period while ending positive — your share count at low prices determines long-run average cost.

Worked example — longer horizon: $300/month for 120 months (10 years) at 7% → about $51,000 balance on $36,000 invested in this model. Doubling the monthly amount roughly doubles both contributions and growth component.

Fees and expense ratios reduce net return. Enter a return assumption net of fund fees if you know your weighted expense ratio.

Not investment advice. Past market patterns do not guarantee future DCA outcomes.

Automatic payroll investing is DCA in practice — the behavioral benefit of staying invested through volatility often outweighs small expected return differences vs lump sum.

Stablecoin or cash DCA during a bear market then lump-sum deployment is a hybrid strategy this smooth model does not capture.

International investors face currency risk on top of return assumptions — USD returns differ from local-currency outcomes.

Lump-sum vs DCA academic studies (Vanguard and others) show lump-sum wins ~two-thirds of historical windows in US equities — DCA still wins on behavior for risk-averse investors.

Stable value funds and money market funds inside 401(k)s DCA at low volatility — return assumption should match asset class, not default to 8%.

Bonuses and windfalls are lump-sum events — some investors DCA windfalls over six months to reduce timing regret even when lump-sum math favors immediate investment.

Employer match is not DCA on your own contribution alone — match dollars are immediate lump-sum additions that change personal return math versus pure periodic investing.

Recurring buys into a 401(k) may include employer match as immediate boost — personal DCA contribution math excludes match unless you add match dollars to the monthly input.

Tax-loss harvesting during DCA into a taxable account adds after-tax benefit this projection ignores — automated investing plus harvesting can improve net outcomes without changing gross return assumption.

Automate transfers on payday to reduce skipped months — behavioral consistency often matters more than optimizing exact investment dates within each month.

Robo-advisors automate DCA into diversified portfolios — the behavioral benefit of staying invested through volatility remains even when a human is not choosing each purchase date.

Windfall DCA over six to twelve months remains popular after bonuses — psychology and liquidity planning often trump small expected return differences versus immediate investment.