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Dollar Cost Averaging Calculator | DCA Investment Strategy

Updated

Dollar Cost Averaging Calculator

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%
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Total Contributions$120,000
Investment Growth$140,000
Final Portfolio Value$260,000
Effective Return117%

How Dollar Cost Averaging Works

Instead of investing a large sum at once, you invest smaller amounts regularly:

Strategy Action
Lump sum Invest $60,000 today
DCA Invest $500/month for 10 years

DCA Example

Investing $500/month with varying prices:

Month Price/Share Shares Bought Total Shares Total Value
1 $50 10 10 $500
2 $40 12.5 22.5 $900
3 $45 11.1 33.6 $1,512
4 $55 9.1 42.7 $2,349
5 $50 10 52.7 $2,635

After 5 months: $2,500 invested → 52.7 shares → $2,635 value

Average price paid: $2,500 ÷ 52.7 = $47.44/share

DCA automatically buys more when prices are low (Month 2: 12.5 shares at $40) and less when high (Month 4: 9.1 shares at $55).

DCA vs Lump Sum Investing

Historical Analysis

Research shows lump sum beats DCA about 2/3 of the time because:

  • Markets trend upward over time
  • Lump sum gets more money working sooner
  • DCA keeps some money on the sidelines
Scenario Lump Sum DCA
Markets rise steadily ✓ Better Worse
Markets fall then rise Worse ✓ Better
Markets fall steadily Less loss ✓ Less loss
Volatile, ending higher ✓ Usually better Sometimes better
Benefit Explanation
Psychological Easier than investing everything at once
Risk reduction Spreads market timing risk
Practical Matches income (monthly paycheck)
Discipline Automatic = consistent

Most people invest via DCA naturally because they invest from each paycheck.

DCA Investment Growth Examples

Assuming 7% annual return:

$250/month

Years Contributions Final Value Growth
5 $15,000 $17,900 $2,900
10 $30,000 $43,400 $13,400
20 $60,000 $130,000 $70,000
30 $90,000 $295,000 $205,000

$500/month

Years Contributions Final Value Growth
5 $30,000 $35,800 $5,800
10 $60,000 $86,800 $26,800
20 $120,000 $260,000 $140,000
30 $180,000 $590,000 $410,000

$1,000/month

Years Contributions Final Value Growth
5 $60,000 $71,600 $11,600
10 $120,000 $173,600 $53,600
20 $240,000 $520,000 $280,000
30 $360,000 $1,180,000 $820,000

When to Use Each Strategy

Use DCA When:

  • Investing from regular income
  • You have a large sum but fear market timing
  • Markets feel overvalued (peace of mind)
  • You’re new to investing

Use Lump Sum When:

  • You receive a windfall (inheritance, bonus)
  • You have a long time horizon (10+ years)
  • You can handle short-term volatility
  • Historical odds favor it (~67%)

Hybrid Approach

Invest some immediately, DCA the rest:

Windfall Lump Sum DCA Timeline
$100,000 $50,000 now $4,167/month 12 months
$50,000 $25,000 now $2,083/month 12 months

This captures some upside while managing risk.

Setting Up Automatic DCA

Step 1: Choose Your Amount

Based on your budget:

Monthly Income Suggested DCA % of Income
$4,000 $400-800 10-20%
$6,000 $600-1,200 10-20%
$8,000 $800-1,600 10-20%

Step 2: Choose Your Frequency

Frequency Pros Cons
Weekly More purchases, smoother More transactions
Biweekly Matches paychecks 26 purchases/year
Monthly Simple, common Fewer purchases

Step 3: Automate It

Most brokerages offer pre-authorized contributions (PAC):

  1. Set contribution amount
  2. Set frequency
  3. Choose investment (e.g., XEQT, VEQT)
  4. Funds automatically purchased

Automation removes emotion — you won’t forget or second-guess.

DCA During Market Crashes

DCA shines during volatility:

Month Market Price $500 Buys
Jan Normal $100 5 shares
Feb Crash $70 7.1 shares
Mar Bottom $60 8.3 shares
Apr Recovery $80 6.25 shares
May Normal $100 5 shares

In 5 months: $2,500 invested → 31.65 shares → $3,165 at $100/share

By buying through the crash, you lowered your average cost and came out ahead.

Common DCA Mistakes

Mistake Problem Solution
Stopping during crash Miss low prices Automate and ignore
Waiting for “dip” Timing the market Invest consistently
Too much cash reserve Money not working Invest each paycheck
Changing amounts often Inconsistent Set and forget