Invest it all now, or spread it out? Compare both.

Lump sum vs dollar-cost averaging: the core question

When you receive a windfall — a bonus, an inheritance, proceeds from a sale — should you invest it all at once (lump sum) or spread it out over months (dollar-cost averaging)? This calculator runs both strategies side by side with the same money and the same expected return, then shows which ends with more and by how much.

What the research generally shows

Historically, investing a lump sum immediately has outperformed dollar-cost averaging the majority of the time. The reason is simple: markets rise more often than they fall, so money that's invested sooner spends more time compounding. On average, being fully invested from the start wins.

When dollar-cost averaging wins

DCA isn't about maximizing the average outcome — it's about reducing risk and regret. Spreading your contributions tends to come out ahead when the market falls early in your window and recovers later, because your later purchases buy in at lower prices. Try the historical scenarios that begin near major downturns to see this effect.

How the calculator works

Enter your lump sum, the monthly amount and number of months for the DCA path, your total time horizon, and either a fixed expected return or a sample historical scenario. The lump sum is invested immediately and grown for the full period. The DCA path adds your contributions over the chosen window, growing whatever is invested at each point. Both use the same return assumptions so the comparison is fair, and the chart traces each strategy's value year by year.

About the historical scenarios

The optional scenario selector uses a simplified sample dataset of historical annual returns to simulate starting in different years — such as the late-90s bull run, the dot-com bust, or the 2008 financial crisis. This sample data is clearly labeled, is not guaranteed accurate, and is included purely to illustrate how the two strategies behave in different environments. It is not a forecast of future returns.

The emotional dimension

Numbers aside, the "best" strategy is the one you can actually stick with. Many investors find DCA easier because it lowers the stakes of any single decision and avoids the worst-case feeling of investing everything right before a drop. If a lump sum would keep you up at night, a measured DCA plan that you'll stay committed to may be the wiser real-world choice.

Keep exploring

Once you've chosen an approach, project ongoing contributions with the dollar-cost averaging calculator and check your progress toward a target using the investment goal calculator. Remember: every result here is a hypothetical estimate, not advice or a prediction.