Dollar Cost Averaging Calculator
Compare investing a lump sum all at once with spreading the same amount over time, and see how compounding and inflation shape each path.
What this calculator shows
It invests the same total two ways — all at once, and gradually over a chosen period — then compounds both at the same assumed return. It helps answer one question: invest all at once, or spread it out? Returns are assumptions, not forecasts or advice.
Inputs
Your monthly amount times the DCA period should equal the total invested.
The same total is used for both strategies.
Invested at the end of each month.
How many months you spread it over.
Compounded monthly from the annual assumption.
Used to estimate purchasing power.
How long both strategies compound.
Schedule matches: $1,000 × 12 months = $12,000.
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- Lump sum final value
- $91,347
- DCA final value
- $88,077
- Difference
- $3,270
- Inflation-adjusted difference
- $1,559
- Better under assumptions
- Lump sum
Invested all at once.
Invested gradually.
Lump sum is higher.
In today's dollars.
Under these assumptions.
- Lump sum
- Dollar cost averaging
Lump sum versus dollar cost averaging value over time.
- Lump sum invested
- DCA invested
How much money is actually invested in each strategy at each point.
Year-by-year comparison
Both strategies side by side each year, in nominal and inflation-adjusted terms.
| Year | Lump sum | DCA | Difference | Lump sum (real) | DCA (real) |
|---|---|---|---|---|---|
| 1 | $12,840 | $12,380 | $460 | $12,527 | $12,078 |
| 2 | $13,739 | $13,247 | $492 | $13,077 | $12,609 |
| 3 | $14,701 | $14,174 | $526 | $13,651 | $13,162 |
| 4 | $15,730 | $15,166 | $563 | $14,250 | $13,740 |
| 5 | $16,831 | $16,228 | $603 | $14,876 | $14,343 |
| 6 | $18,009 | $17,364 | $645 | $15,529 | $14,973 |
| 7 | $19,269 | $18,579 | $690 | $16,211 | $15,630 |
| 8 | $20,618 | $19,880 | $738 | $16,922 | $16,316 |
| 9 | $22,062 | $21,272 | $790 | $17,665 | $17,033 |
| 10 | $23,606 | $22,761 | $845 | $18,441 | $17,781 |
| 11 | $25,258 | $24,354 | $904 | $19,250 | $18,561 |
| 12 | $27,026 | $26,059 | $968 | $20,096 | $19,376 |
| 13 | $28,918 | $27,883 | $1,035 | $20,978 | $20,227 |
| 14 | $30,942 | $29,835 | $1,108 | $21,899 | $21,115 |
| 15 | $33,108 | $31,923 | $1,185 | $22,860 | $22,042 |
| 16 | $35,426 | $34,158 | $1,268 | $23,864 | $23,009 |
| 17 | $37,906 | $36,549 | $1,357 | $24,911 | $24,020 |
| 18 | $40,559 | $39,107 | $1,452 | $26,005 | $25,074 |
| 19 | $43,398 | $41,845 | $1,554 | $27,147 | $26,175 |
| 20 | $46,436 | $44,774 | $1,663 | $28,339 | $27,324 |
| 21 | $49,687 | $47,908 | $1,779 | $29,583 | $28,524 |
| 22 | $53,165 | $51,261 | $1,903 | $30,882 | $29,776 |
| 23 | $56,886 | $54,850 | $2,037 | $32,237 | $31,083 |
| 24 | $60,868 | $58,689 | $2,179 | $33,653 | $32,448 |
| 25 | $65,129 | $62,797 | $2,332 | $35,130 | $33,872 |
| 26 | $69,688 | $67,193 | $2,495 | $36,672 | $35,359 |
| 27 | $74,566 | $71,897 | $2,670 | $38,282 | $36,912 |
| 28 | $79,786 | $76,930 | $2,857 | $39,963 | $38,532 |
| 29 | $85,371 | $82,315 | $3,056 | $41,718 | $40,224 |
| 30 | $91,347 | $88,077 | $3,270 | $43,549 | $41,990 |
Lump sum ends higher by $3,270 — but that is a steady-return model talking, with no volatility and no sequence risk in it.
The difference
Under these assumptions, lump sum ends higher by $3,270.
Early exposure
DCA invests gradually, so less money is exposed early in the projection.
Compounding and timing
If expected returns are positive, investing earlier often benefits more from compounding.
What this leaves out
DCA may reduce timing regret, but this model does not simulate volatility or market crashes.
Inflation affects both
Inflation reduces the purchasing power of both strategies over time.
This model assumes a steady return. It does not simulate volatility, market crashes, or the order of returns (sequence risk). It does not guarantee that either strategy will perform better in reality.
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This is an educational model, not a forecast. It compounds both strategies monthly at the same assumed return, adds DCA contributions at the end of each month, and discounts results by inflation. This model assumes money not yet invested during the DCA period earns 0%.
What dollar cost averaging means
Investing a fixed amount on a schedule, spreading your money in over time instead of all at once.
What lump sum investing means
Investing the full amount at once, so all of it is exposed to growth from the start.
Why lump sum can end higher
In a steady-growth model, money invested earlier has more time to compound, so lump sum often ends ahead.
Why DCA can still help
Spreading money in can reduce the regret of investing right before a drop, and can make it easier to start.
Why this is not a forecast
Real returns are uneven. This model assumes a steady return and cannot predict any actual outcome.
Why volatility matters
The order of returns (sequence risk) can change which approach feels better in real life — something this model does not simulate.
Related concepts
Keep exploring the ideas behind dollar-cost averaging.
Frequently asked questions
Common questions about dollar-cost averaging versus lump-sum investing.
What is dollar-cost averaging (DCA)?
Dollar-cost averaging is investing a fixed amount at regular intervals regardless of price. You automatically buy more when prices are low and less when they are high, which removes the pressure of trying to time the market.
Is dollar-cost averaging better than lump-sum investing?
It depends. Historically, investing a lump sum immediately has often come out ahead because markets tend to rise over time, so money is invested sooner. But DCA reduces regret and smooths the entry, which can make it easier to stay invested. This tool compares both on equal capital so you can see the trade-off.
How does this calculator compare DCA and lump sum?
It invests the same total amount two ways — all at once, and spread evenly over a period you choose — then compounds both at the same assumed return. Fairness gates make sure the schedule totals the amount and fits inside the projection window, so the comparison is apples-to-apples.
Does dollar-cost averaging reduce risk?
It can reduce the risk of investing everything right before a downturn, and it lowers the emotional weight of any single decision. It does not remove market risk, and over long horizons it can leave money uninvested longer than a lump sum would.
Can I model a weekly or monthly schedule?
Yes. You set the amount and the period, and the tool spreads contributions across that window, then compares the result against investing the same total as a lump sum.
Is this financial advice?
No. It is an educational comparison based on the assumptions you enter. It does not recommend a strategy or predict returns — results depend entirely on your inputs.
This is one of several educational models on Rionux. See how we model these projections across all our tools.
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Educational use only
Educational purposes only. Calculator results are estimates based on assumptions and user inputs. They are not financial, investment, legal, or tax advice. Investing involves risk, including possible loss of principal. Past performance does not guarantee future results.