Dollar-cost averaging, commonly called DCA, is an investing strategy where you
invest a fixed amount of money at regular intervals. Instead of trying to
predict the best time to invest, you make consistent purchases through
different market conditions.
Because the price of an investment may change from one contribution to the
next, each purchase buys a different number of shares. Calculating your
average cost per share helps you understand the effective price you paid over
the entire investing period.
What Is Dollar-Cost Averaging?
Dollar-cost averaging means investing the same amount of money on a recurring
schedule, regardless of whether the market is rising or falling. For example,
you might invest $500 every month into a diversified stock fund.
When prices are lower, your fixed contribution purchases more shares. When
prices are higher, it purchases fewer shares. Over time, this produces a
weighted average purchase price based on the total amount invested and the
total number of shares purchased.
Important: DCA can make investing more systematic and reduce
the pressure of making one large market-timing decision, but it does not
eliminate investment risk or guarantee a profit.
Dollar-Cost Averaging Example
Suppose you invest $500 four times, for a total investment of
$2,000. The investment price changes during each period, so the number of
shares purchased also changes.
| Period |
Amount Invested |
Price Per Share |
Shares Purchased |
| Period 1 |
$500 |
$50 |
10.00 |
| Period 2 |
$500 |
$40 |
12.50 |
| Period 3 |
$500 |
$25 |
20.00 |
| Period 4 |
$500 |
$50 |
10.00 |
| Total |
$2,000 |
— |
52.50 |
Average Cost Per Share =
$2,000 ÷ 52.50 = $38.10 per share
In this example, the average cost per share is $38.10. Notice that the simple
average of the four listed prices would be $41.25, which is not the correct
DCA result. The lower price in Period 3 allowed the fixed $500 contribution
to purchase more shares.
How DCA Works in Rising and Falling Markets
DCA automatically changes the number of shares you buy as prices move. A
regular contribution buys fewer shares when prices are high and more shares
when prices are low.
When prices fall
- Your fixed contribution buys more shares.
- You may lower your overall average cost.
- You continue investing without needing to predict the bottom.
When prices rise
- Your fixed contribution buys fewer shares.
- Your existing holdings may increase in value.
- You continue building your position consistently.
Benefits and Limitations of DCA
Potential benefits
Dollar-cost averaging can help create a consistent investing habit. It may
also reduce the emotional pressure associated with deciding when to invest a
large amount of money. Automated contributions can make it easier to follow a
long-term investment plan.
Important limitations
DCA does not protect you from losses, and it does not guarantee better returns
than investing a lump sum. If markets rise consistently, investing available
cash earlier may provide more time in the market. DCA also cannot compensate
for choosing an unsuitable or poorly diversified investment.
Remember: Your investment timeline, risk tolerance, available
cash, fees, taxes, and asset selection all matter when choosing an investing
approach.
Calculate Your DCA Strategy
Enter your investment amounts, purchase prices, and contribution schedule to
quickly estimate your total shares and average cost per share.
Open the Free DCA Calculator
Frequently Asked Questions
Is dollar-cost averaging better than investing a lump sum?
It depends on your circumstances. Lump-sum investing may provide greater
long-term market exposure when you already have cash available, while DCA
can make investing more comfortable and help reduce the risk of investing
everything immediately before a decline.
How often should I use dollar-cost averaging?
Many investors contribute weekly, biweekly, or monthly. The most useful
schedule is one that matches your income and can be followed consistently
over a long period.
Can dollar-cost averaging guarantee a profit?
No. DCA does not eliminate investment risk or guarantee returns. The value
of your investments can rise or fall, and you can lose money.
What investments can be used with DCA?
DCA can be used with many assets, including diversified stock funds,
exchange-traded funds, mutual funds, and other investments that support
recurring purchases.
This article is for educational purposes only and is not financial, investment,
tax, or legal advice. Past performance does not guarantee future results.