Averaging Down vs. Averaging Up: When and How

“Averaging down” means buying more after a drop to lower your average cost; “averaging up” means buying more after a rise to build the position. Both change your average price, but their purpose and conditions are completely different.

Averaging down — buying more to lower your cost

Buying more of a holding after it falls lowers your average cost. If you bought 10 shares at 100 and add 10 more at 80, your average becomes 90. The upside: the rise you need to break even gets smaller.

The catch is “why are you buying?” If you keep buying just because it got cheaper, you concentrate your account into a falling stock — and that risk grows fast.

Averaging up — scaling into a winner

Adding in an uptrend raises your average cost but grows a winning position. It’s common in trend-following. Because you’re buying at a higher price, managing your stop-loss line matters even more.

Three things to check first

• If you were seeing this stock for the first time today, would you still buy it? (If not, the case for averaging down is weak too.)
• After adding, what share of your account will this one stock take up?
• Have you decided in advance where you’ll cut the loss if you’re wrong?

Run the numbers

Exactly where your average cost lands after adding, and how much to buy relative to your account, are safer decided by calculation than by feel. Check it with the calculators below.