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Lump Sum vs DCA Calculator

Compare investing a windfall all at once versus dollar-cost averaging over time with expected return projections.

Decision support

Interpretation

Based on expected returns, lump sum investing produces about $3,143.98 more (3.23% higher) than spreading the same amount over 12 months.

Recommendation

Lump sum investing has the higher expected value here, but DCA may still be preferable if you are risk-averse, recently received a windfall, or want to reduce timing anxiety after a market run-up.

Assumptions

Assumes constant expected returns with monthly compounding, no taxes or fees, and that the full amount is invested. Actual market returns are uncertain and short-term results can differ significantly from long-run averages.

Detailed results

Lump sum future value ($)
100,483.07
DCA future value ($)
97,339.09
Difference ($)
3,143.98
Percentage difference (%)
3.23

Received a bonus, inheritance, or large cash balance? You can invest it all immediately (lump sum) or spread purchases over time (dollar-cost averaging). Historically, lump sum often wins on expected value — but DCA can reduce timing risk and emotional stress.

How to use this calculator

  1. Enter the total amount you plan to invest.
  2. Enter expected annual return and how many months you would spread DCA purchases.
  3. Enter your full investment horizon in years.
  4. Review future values, the difference, and the recommendation.

Formula

Lump sum grows the full amount for the entire horizon with monthly compounding. DCA splits the amount into equal monthly investments during the DCA window, then compounds the balance through the remaining horizon. Actual returns vary; this is an expected-value comparison.

Example

$50,000 invested at 7% over 10 years grows to about $98,358 as a lump sum. Spreading the same amount over 12 months of DCA yields roughly $94,200 — a difference of about $4,158 (4.4%) in this projection.

Frequently asked questions

Does lump sum always beat DCA?
Not always in real markets. Lump sum tends to win more often when markets rise over time, but DCA can outperform if you invest during a prolonged decline.
When is DCA still a good choice?
DCA may help risk-averse investors, those nervous about market highs, or anyone who wants a disciplined entry after a windfall without betting on a single day.

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