Dollar cost averaging means investing the same amount of money at regular intervals, such as $100 every payday, no matter what the market is doing.
How it works
When prices are lower, your fixed amount buys more shares. When prices are higher, it buys fewer. Over time, your average cost is smoothed out.
A quick example
Invest $100 a month. In month one the price is $10 and you buy 10 shares. In month two it is $8 and you buy 12.5 shares. In month three it is $12 and you buy about 8.3 shares. You spent $300 for about 30.8 shares, an average of about $9.74 per share.
What it does well
It removes the pressure to pick the perfect time, builds a habit and keeps emotions out of the process.
Where it falls short
It does not guarantee a profit or protect you from a falling market. If you have a lump sum and a long time frame, studies often show that investing it all at once has done better on average, though dollar cost averaging can feel easier to stick with.
Make it automatic
Set up a recurring transfer. The best plan is the one you will actually follow.
How it works
Dollar cost averaging means investing a fixed amount on a set schedule, such as $200 on the first of each month, no matter the price. When prices are low you buy more shares. When prices are high you buy fewer.
An example
You invest $100 a month. In month one the price is $10 and you buy 10 shares. In month two it is $5 and you buy 20. In month three it is $10 and you buy 10. You spent $300 for 40 shares, an average cost of $7.50, below the average price of $8.33.
What it does and does not do
It builds a habit and reduces the risk of putting everything in at a bad moment. It does not guarantee a profit or protect against a falling market. If prices rise steadily, investing all at once would have done better. If they fall, waiting would have. Use the average cost calculator on our tools page.
Frequently asked questions
Is it good for beginners?
Yes, because it keeps you consistent. Pair it with compound growth over time.
Keep learning about dollar cost averaging
Reading is a start, practice makes it stick. Run the numbers in our investor tools, test yourself in Stock Jeopardy, or follow the start here guides to see what to read next after dollar cost averaging.
Further reading: Investor.gov from the U.S. SEC and the Canadian Securities Administrators investor education site offer free, independent guides for new investors.
A longer example with four purchases
Let us use bigger numbers to see the math more clearly. You invest $200 a month for four months. The share price is $20 in month one, $16 in month two, $25 in month three, and $20 in month four. Your $200 buys 10 shares, then 12.5 shares, then 8 shares, then 10 shares. That is 40.5 shares for $800 in total.
Your average cost per share is $800 divided by 40.5, or about $19.75. The simple average of the four prices is $20.25. You paid a bit less than the average price because the cheap month bought more shares. This effect is real, but small here. It will not turn a falling stock into a winner. If the price had dropped to $10 and stayed there, you would still be down. DCA changes how you buy, not whether the investment is good.
DCA compared with putting it all in at once
Suppose you receive $12,000 and choose between investing it all today or $1,000 a month over a year. If prices rise most of the year, the lump sum is ahead, because more of your money was invested earlier. If prices fall for a while, the monthly plan does better, because later purchases are at lower prices. Many studies of past market data have found that lump sum investing came out ahead more often than not, mainly because markets have risen more often than they have fallen. That does not mean it will next time. The honest answer is that nobody knows ahead of time.
Many people choose DCA for another reason. It lowers the chance of regret. Putting everything in right before a drop is a painful experience. Spreading purchases out can make it easier to stay calm and stick with the plan.
Where the money comes from matters most
For most people, DCA is not a choice between a lump sum and monthly buying. It is the only way they can invest, because the money arrives with each paycheck. A workplace retirement plan that takes a set amount from every check is DCA by default. You are already doing it, and it works because you do not have to decide each month.
Fees and fractional shares
Small monthly buys can run into costs. If your broker charges a fee on each trade, a $50 purchase with a $5 fee gives up 10% right away. Many brokers now offer no commission trades and fractional shares, so even a small amount can be fully invested. Check your broker’s fee list before setting up a plan. It is easy to find and can make a real difference.
Common mistakes
- Stopping the plan when prices drop, which removes the very feature that helps.
- Using DCA on a single risky stock and calling it safe.
- Paying trade fees that eat up small purchases.
- Forgetting to raise the amount as income grows.
What to do next
Choose an amount you can keep up for at least a year, even in a tight month. Pick a date that follows payday. Set the transfer and purchase to run on their own. After six months, use the dollar cost averaging calculator to see your average cost, and the average cost basis calculator to check it against your statement. To see how steady deposits can grow over longer periods, try the return on investment calculator with a modest rate. The goal is a habit you can keep, not the perfect moment.
Education only, not investment advice.
