DCA Calculator
Model dollar-cost averaging returns with custom investment amounts, frequencies, and price changes. See total invested, current value, and average cost basis.
DCA Parameters
Total Invested
$6,000.00
Current Value
$7,316.75
Profit / Loss
+1,316.75
21.95%
Average Cost Basis
$123.01
Total Shares/Units
48.7783
DCA vs Lump Sum Comparison
Lump sum at start price
$9,000.00
DCA result
$7,316.75
How to Use DCA Calculator
- 1
Set investment amount
Enter how much you invest each period.
- 2
Choose frequency
Select weekly, biweekly, or monthly investment frequency.
- 3
Enter price range
Set the start price and end price of the asset over your time period.
- 4
Set time period
Enter the investment duration in months.
- 5
Analyze results
See total invested, current value, profit/loss, and average cost basis.
Frequently Asked Questions
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Dollar-Cost Averaging: What It Actually Does
Dollar-cost averaging (DCA) is the strategy of investing a fixed dollar amount at regular intervals — say, $500 every month — regardless of what the market is doing. When prices are high, your $500 buys fewer shares. When prices drop, the same $500 buys more shares. Over time, this naturally biases your average purchase price downward relative to the simple time-weighted average price. It doesn't eliminate risk, but it does remove the pressure of trying to time the market.
Lump Sum vs DCA: The Honest Comparison
Research consistently shows that investing a lump sum beats DCA about two-thirds of the time. That's because markets tend to go up over time — money invested earlier generally earns more than money invested gradually. A Vanguard study found lump sum investing outperformed DCA by an average of 2.3% over 12-month periods across US, UK, and Australian markets.
So why does DCA remain popular? Because most people don't have a lump sum sitting idle — they invest from income as it arrives. And for those who do have a lump sum but are emotionally paralyzed by market uncertainty, DCA provides a structured way to get invested rather than sitting in cash indefinitely. The psychological benefit is real, even if the mathematical case for lump sum is stronger.
Historical Evidence for Index Fund DCA
Looking at the S&P 500 since 1950, there is no 20-year rolling period in which a consistent DCA investor lost money. Even investors who started DCA right before major crashes — 2000, 2008 — came out ahead if they stayed the course for two decades. This doesn't mean past performance guarantees future results, but it does illustrate why time in the market consistently trumps timing the market for long-term investors.
Practical DCA: Automating the Discipline
The real value of DCA for most people is behavioral. By automating a fixed investment each month — into a 401(k), IRA, or brokerage account — you remove the decision entirely. You don't have to think about whether now is a good time to invest. You don't read market news and hesitate. You invest in February's dip and October's rally alike, and your average cost reflects the full range. Over a 20-30 year career, this consistency compounds into significant wealth without requiring any market expertise.