Dollar-Cost Averaging Calculator
Compare investing a lump sum now against spreading it out over time, in both a rising and a falling market.
Your details
Details
What the money not yet invested earns while it waits
Positive means prices fall while you are buying, which helps DCA
This calculator runs entirely on your device. Nothing you enter is uploaded, stored, or sold. How this works
Lump sum comes out ahead
$3,351
$129,535 lump sum vs. $126,184 averaged in, after 10.0 years
Includes your inputs, the full breakdown, and every row of the table.
Lump sum result
$129,535
DCA result
$126,184
Difference
+$3,351
2.7% gap
Invested per month
$5,000.00
For 12 months
- Amount to invest
- $60,000
- DCA purchase size
- $5,000.00
- Assumed market move while buying
- Flat
- Lump sum final value
- $129,535
- DCA final value
- $126,184
What this means
- With a flat or rising market, investing everything immediately wins, because money sitting in cash is not compounding at the market rate.
- Set the market drop above zero to model averaging into a decline — the scenario where DCA genuinely shines.
- Historically, lump-sum investing beats averaging in roughly two thirds of periods. The case for DCA is behavioural: it is easier to stick with, and regret is easier to bear.
How the dollar-cost averaging calculation works
Dollar-cost averaging means investing a fixed amount at regular intervals instead of all at once. It is often presented as strictly safer, which is not quite right — it is a trade of expected return for reduced regret.
The mathematics are not really in dispute. Markets rise more often than they fall, so cash waiting on the sidelines usually misses returns. That is why lump-sum investing wins about two thirds of the time in historical studies.
The argument for averaging in is psychological, and it is a serious one. Investing your entire inheritance the week before a 30% drawdown is the kind of experience that pushes people out of the market permanently. A strategy you can actually stick with beats a marginally better one you abandon.
Note that this debate only applies to a windfall. If you are investing each paycheck, you are dollar-cost averaging by necessity, and that is simply fine.
Frequently asked questions
So should I just invest it all at once?
If you can genuinely tolerate an immediate large drop, the expected value favours it. If a bad first month would make you sell everything, average in over six to twelve months and accept the small expected cost.
Does DCA reduce risk?
It reduces the risk of terrible timing on a single day, while introducing the risk of missing a rally. It lowers the variance of outcomes rather than eliminating downside.
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Disclaimer. This calculator is provided for general information and educational purposes only and does not constitute financial, tax, legal, medical, or engineering advice. Results are estimates based on the inputs you provide and the assumptions described above. Confirm any figure with a qualified professional before acting on it.