Compare lump-sum investing versus dollar-cost averaging with periodic investment modeling and historical return scenarios.
This calculator answers a timing question: how would the same investable amount fare if committed immediately or divided among recurring purchases? It models the lump-sum path, the dollar-cost averaging schedule, and historical-return scenarios so their ending values can be compared over a common horizon. The result is a timing comparison, not a forecast or investment recommendation. A common surprise is that dollar-cost averaging does not automatically increase returns. When prices generally rise, money reserved for later installments spends less time invested.
A concrete input and expected output from the current implementation.
Input
Total amount: $1,200; DCA schedule: 12 monthly investments of $100; return scenario: constant 0%
Expected output
Lump-sum ending value: $1,200. DCA ending value: $1,200. Difference: $0.
With a zero return, neither the initial investment nor any installment gains or loses value. Twelve purchases of $100 contribute exactly $1,200, so the two strategies finish equally.
The lump-sum side places the full comparison amount at the beginning of the chosen horizon. Each modeled or historical period then changes that invested balance. With no intervening cash flows, its ending value depends on the compounded return over the full horizon, not the order of periodic returns. The comparison is meaningful only when its starting capital matches the total of the scheduled DCA purchases.
The DCA side divides the capital across the selected purchase cadence. An installment participates only in returns occurring after its purchase date, so later installments have fewer periods to compound. Under a historical scenario, the order of observed gains and losses matters. Identical average returns can produce different comparisons when the cash flows enter the market at different times.
No. It means the scheduled purchases performed better under the specific return sequence and dates entered or selected. Dollar-cost averaging can reduce exposure to a badly timed initial purchase, but it can also trail when prices rise while part of the money remains uninvested. The calculator does not establish which strategy will win in a future period.
The dollars are exposed to different portions of the return path. A lump sum receives every gain and loss from the initial date, while each DCA installment receives only subsequent returns. Early market movements therefore affect the lump sum more heavily. The return earned by cash awaiting investment can also matter if it is included in the comparison.
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