Dollar-Cost Averaging (DCA) Calculator

Periodic Investing vs. Lump Sum

Investment Plan

Amount Per Period ($)

Frequency

Time Horizon (Years)

Expected Annual Return (%)

DCA Future Value

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Understanding Dollar-Cost Averaging

Dollar-cost averaging (DCA) means investing a fixed amount on a regular schedule -- every paycheck or every month -- regardless of whether prices are up or down, rather than trying to time the market with a single lump-sum purchase.

Consistency Over Timing

DCA removes the pressure of guessing the "right" moment to invest -- you buy on a fixed schedule at whatever the price happens to be.

Lump Sum Usually Wins, on Average

If you already have the full amount available, investing it all today has historically outperformed DCA more often than not, simply because markets trend upward over time and more money spends more time invested. This calculator's comparison assumes a constant return, so it shows that mathematical edge directly -- DCA's real-world advantage is behavioral and risk-related, not about higher expected returns.

DCA's Real Advantage Is Behavioral

Spreading purchases out reduces the emotional risk of investing a large sum right before a downturn, and makes ongoing investing from a paycheck practical in the first place.

A Simplified Projection

This calculator assumes a single constant annual return rate, not the fluctuating year-to-year returns of a real market -- it's meant to illustrate the mechanics, not predict exact future results.

Worked Example

Suppose you invest $500/month for 10 years at an assumed 7% annual return:

Total invested: $500 × 120 months = $60,000.
DCA future value: ≈ $86,542.
Lump sum comparison (all $60,000 invested today at the same rate): ≈ $118,029.

10-Year Outcome

Invested: $60,000
DCA Value: $86,542
Lump Sum Value: $118,029

Key Takeaways

Great for Ongoing Contributions: DCA is simply how most people invest from every paycheck -- it isn't an alternative strategy so much as the default.
Lump Sum Edge Assumes You Have the Cash: The comparison only matters if you're deciding between investing a windfall all at once vs. spreading it out.
Past Returns Aren't Guaranteed: Treat the assumed return rate as an estimate, not a promise.