Dollar Cost Averaging Calculator: Invest on Autopilot

A longer example with a falling and rising price

The first example had three months. Let’s stretch it to six, with a $200 deposit each month and these prices: $20, $16, $12, $10, $14, $18. Shares bought each month are 10, 12.5, 16.67, 20, 14.29 and 11.11. Added together, that is about 84.57 shares for $1,200, which makes the average cost about $14.19 per share.

Compare that with the simple average of the six prices, which is $15. The difference exists because your fixed deposit bought more shares when the price was low. At the last price of $18, those shares are worth about $1,522, which is a gain of about $322. Notice that the result depended on the price recovering. If the price had stayed at $10, the value would be about $846, a loss of about $354. Dollar cost averaging does not remove that risk.

Where dollar cost averaging fits and where it does not

This method is a good match for money that arrives regularly, like a paycheck. You decide on an amount, set it to buy automatically, and leave it. Many retirement plans work this way without you thinking about it.

It is a weaker fit if you already have a large lump sum. Research has often found that investing the whole amount sooner does better on average, because markets tend to rise over long periods. But the average hides the bad cases, and some people sleep better spreading a big sum over several months. That is a personal comfort choice, not a right or wrong one.

Common problems that quietly hurt results

Fees are the first. If you pay $5 on every $100 purchase, you lose 5 percent right away. Look for low or no commission options and consider fewer, larger deposits if costs are high. The second is picking a risky single stock and assuming the method will rescue it. A steady schedule helps with timing, but it cannot make a weak company strong. The third is stopping when prices fall. That is exactly when the plan buys the most shares for your money.

Setting up a plan you can keep

Choose an amount that fits your budget after bills and savings for emergencies. A small amount you keep up for years beats a large one you stop after three months. Pick a day soon after payday. Review once or twice a year, not every week.

Try the dollar cost averaging calculator with your own numbers. Then use the average cost basis calculator to see how your real purchases add up, and the glossary for any new terms. You can find free beginner guides at investor.gov.

This is education only and not investment advice.

The method only controls when you buy, not what. Many people use it with a broad fund because it spreads risk across many companies. Putting every deposit into one small company adds a risk that the schedule cannot fix. Think about the choice of investment first, and the schedule second.

>

Questions people ask about dollar cost averaging

Does dollar cost averaging beat lump sum investing?

Not always. Research often finds that investing a lump sum earlier does better more often, because markets tend to rise over time. Regular deposits can still suit people who invest from each paycheck.

Does it protect me from losses?

No. It spreads out your purchase prices but cannot prevent losses if prices fall and stay low. All investing carries risk, including the loss of money.

How often should I invest?

Any set schedule works, such as weekly or monthly. Many people match it to payday. The best schedule is one you can keep up without stress. Pick an amount that still leaves room for bills and savings you may need soon.

Do fees matter with small deposits?

Yes. Per-trade fees can take a large share of a small deposit. Check your broker’s fees before you set up any schedule. Use the calculators to see how steady deposits might add up.

Quick recap

Dollar cost averaging means investing a fixed amount on a regular schedule. It builds a habit and spreads out purchase prices. It does not guarantee profit or prevent loss. Choose an amount you can keep up.