Lump sum vs spreading it out
Assumes a constant annual return with no volatility — it isolates the effect of time spent invested, not market timing risk. See the FAQ below for why that matters.
Why lump sum tends to win on paper
When you spread an investment out over several months instead of investing it all immediately, part of the money sits uninvested for longer — earning nothing — before it's put to work. Assuming the market trends upward on average, more time invested tends to produce a higher expected balance. That's the entire effect this calculator isolates: not which strategy is "smarter", just the mathematical consequence of time in the market.
When spreading it out still makes sense
If a lump sum represents money you'd be uncomfortable seeing drop sharply right after investing it — a windfall, an inheritance, or a large bonus — dollar-cost averaging trades some expected return for a smoother ride in, which can be worth it purely for your own ability to stick with the plan. See our investing guide for how this fits alongside choosing a platform, and our fee impact calculator for how ongoing fees compound on top of either approach.
Frequently asked questions
Does dollar-cost averaging usually beat investing a lump sum?
Not on average, assuming markets trend upward over time. Spreading a lump sum out means part of it sits in cash for longer instead of being invested, which tends to produce a lower expected outcome than investing it all immediately — this calculator isolates exactly that effect.
So why would anyone use dollar-cost averaging?
Risk tolerance, not expected return. DCA reduces the chance of investing everything right before a downturn, which matters more to some investors than the modestly higher expected outcome of a lump sum. This calculator shows the expected-return trade-off, not the risk trade-off.
Does this calculator account for market volatility?
No — it applies one constant assumed annual return, so it shows the effect of time-in-market alone. Real markets fluctuate, which is the main reason some investors prefer DCA despite its lower expected return in this simplified model.