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A Beginner's guide to dollar-cost averaging

An investing strategy to consider

Dollar-cost averaging is when you invest equal dollar amounts at regular intervals—like $25 a month—whether the market or your investment is going up or down. Want to know if this strategy's right for you? It's helpful to understand the math.

A stylized green calendar icon displaying "$25" on the page, with the words "Intervals" above and "Per Month" below, illustrating regular monthly investment contributions.

Here’s an example…

A green, stylized robot face logo with two circular eyes and an antenna above it, accompanied by the text "Qualified Robotics Scientific."

Say you decide to invest using a dollar-cost averaging strategy. And on the 1st of every month, your account is set to automatically buy $25 of Qualified Robotics Scientific (QRST), a fictional company.

A simplified line chart showing stock prices rising in February and falling again in March, with $25 investment markers placed above each month—January, February, and March—to demonstrate buying shares at regular intervals regardless of price.
  • January 1: QRST trades at $10 per share. $25 buys 2.5 shares. 
  • February 1: QRST trades at $12.50 per share. $25 buys 2 shares. 
  • March 1: QSRT trades at $10 per share. $25 buys 2.5 shares.

When the market moves…

On March 15, the company makes a major announcement: their new robot dog is here. This dog can fetch shoes, find keys, and protect the yard—all without any of the responsibility of having an actual dog. 

By April 1, QRST trades at $50 per share. Your $25 buys ½ share.  

A green illustration showing a person interacting with a robotic dog next to a rising stock price chart from April to May, with a $25 investment marker at the point where the price begins to rise.

Things continue like this till May. Until a rogue robot dog fetches its owner's foot instead of a shoe. And... QRST falls to $8. In September, your $25 buys 3.125 shares. 

An orange illustration showing a news headline labeled " Disaster!" next to a falling stock price chart from April to May, with a $25 investment marker indicating a purchase during the market drop.

But guess what? It turns out that dog bite story was just a hoax—and the stock price rose.  

A yellow green illustration of a news headline labeled "Hoax!" next to a stock price chart showing volatility from April to June, with $25 investment markers at each month to demonstrate consistent investing during fluctuations.

Dollar-cost averaging can help manage risk…

The price of stocks can change like this in real life. Investors may use dollar-cost averaging to help navigate uncertain times. It can also serve as a risk management trading strategy if you end up buying more when the price is relatively lower—and buying less when the price is relatively higher.

Dollar-cost averaging can help take some of the guesswork and emotion out of investing, which may keep you from panicking when prices fall or buying more when things might seem to be too good to be true.

While dollar-cost averaging doesn't ensure a profit or protect against loss in declining markets, it's a strategy that some investors use to make regular contributions without trying to "time the market." 

Set your investing on repeat

Choose recurring investments in stocks, mutual funds, ETFs, and Fidelity Basket Portfolios.

More to explore

Investing involves risk, including risk of loss.

Past performance is no guarantee of future results.

Stock markets are volatile and can fluctuate significantly in response to company, industry, political, regulatory, market, or economic developments. Investing in stock involves risks, including the loss of principal.

Dollar cost averaging does not assure a profit or protect against a loss in declining markets. For a Periodic Investment Plan strategy to be effective, customers must continue to purchase shares both in market ups and downs.

The images, graphs, tools, and videos are for illustrative purposes only.

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