Dollar-Cost Averaging (DCA)
Dollar-cost averaging (DCA) is the practice of investing a fixed dollar amount at regular intervals — weekly, monthly, or with each paycheck — regardless of whether the market is up or down. When prices are high, your fixed amount buys fewer shares. When prices are low, it buys more.
Why DCA Works
The math of DCA means you automatically buy more shares when prices are low and fewer when they are high. Over time, this results in a lower average cost per share than if you had tried to time purchases.
DCA vs. Lump Sum Investing
| Scenario | DCA | Lump Sum | |----------|-----|----------| | Market goes up steadily | Slightly underperforms | Outperforms | | Market is volatile | Reduces average cost | Depends on timing | | Investor has behavioral discipline | Enforces it | Requires it | | Investor is risk-averse | Feels safer | Harder emotionally |
Historically, lump-sum investing outperforms DCA roughly two-thirds of the time in rising markets — because time in the market matters. But DCA reduces regret and enforces discipline, which often matters more for real investor behavior.
Practical DCA: The Paycheck Investor
The most common form of DCA is contributing a percentage of each paycheck to a 401(k) or IRA. You invest automatically, every two weeks, without ever looking at what the market is doing. Over 30 years, this disciplined approach has made ordinary earners into millionaires.
Related Tools
- Compound Interest Calculator — Model DCA growth over time with regular contributions
- Retirement Calculator — See the impact of consistent monthly investing on retirement savings
- CAGR Calculator — Evaluate the annualized return on your DCA investment