What does scaling in and out mean?

Both are position-management rules decided before the trade, not reactions during it. They change how many shares you hold as price moves, but not the basic plan: an entry, a stop where the idea is wrong and a size that keeps the loss affordable. The drawing at the top shows a full cycle: buys on the way up, sells near the top, and the shares held rising, then falling.

Scaling in
Entering a position in two or more parts. The disciplined version adds only after the first part shows a profit.
Pyramiding
Adding to a winning position in steps, usually each smaller than the last, with the stop raised before each add.
Scaling out (partial profit)
Selling part of a position at a target and keeping the rest for a bigger move.
Runner
The last part of a position, held with a trailing stop after the partial exits.
Breakeven stop
A stop moved to the entry price, so the remaining shares no longer risk a loss, apart from costs and gaps.

How to scale in: add to winners with the total risk capped

Decide the whole plan first: the maximum risk for the trade, the size of the first part and where adds are allowed. Then add only after the trade has moved in your favour, and raise the stop before each add, so that the worst case never exceeds the cap. Jesse Livermore’s trading rules describe the same idea from a century ago.

Hypothetical, as in the drawing below: a $20,000 account caps total risk at 1%, or $200. Buy 100 shares at $40.00 with a stop at $38.00: the worst case is −$200. At $42.00, raise the stop to $40.00 and add 60 shares: if the stop is hit now, the first 100 break even and the 60 lose $120. At $44.00, raise the stop to $42.00 and add 40: a stop-out now still makes +$120. Each add is smaller, and the loss never exceeds the $200 cap.

The cost: the average price rises to $41.40 on 200 shares. A sharp reversal right after the last add hits the $42.00 stop for +$120 (+0.6R), where the first 100 shares alone would have made +$200 (+1R) at the same stop. A raised stop also sits closer to price and gets hit more often. Size each part with the position size calculator.

Turn your phone sideways to read the drawing. Tap to close.

A hand-drawn pyramid of three blocks: 100 @ 40.00 at the bottom, 60 @ 42.00 in the middle and 40 @ 44.00 on top, labeled each add is smaller, with a note: raise the stop before each add. Beside it, bars for the loss if the stop is hit now: −$200 after the first buy (stop 38.00), −$120 after add 1 (stop 40.00) and +$120 after add 2 (stop 42.00), with a red dashed risk cap line at 1% = −$200.

How to scale out: partial profits at 1R and 2R, then a runner

A common plan sells a third at 1R, a third at 2R and lets the last third run with a trailing stop. Hypothetical, as in the drawing below: buy 300 shares at $50.00 with a stop at $49.00. The whole position risks $300, so 1R for this trade is $300, or $1.00 a share.

Moving the stop to breakeven after the first sale protects the rest, but an ordinary pullback can then take it out at the entry. Some traders wait for a new higher low before moving it, as the stop loss and take profit guide suggests. The steps of this plan:

  1. At $51.00 (1R), sell 100 shares: +$100. Move the stop on the other 200 to $50.00, the entry.
  2. At $52.00 (2R), sell 100 more: +$200. Raise the stop to $51.00.
  3. Trail the last 100 under each new higher low. They are stopped out at $54.50: +$450.
  4. Total: +$750 on a $300 risk, or +2.5R for the whole position, before costs.

Turn your phone sideways to read the drawing. Tap to close.

A hand-drawn price ladder from 49.00 to 54.50: price rises from the entry at 50.00 (buy triangle); a sell triangle at 51.00 (1R) labeled sell 1/3, where the red dotted stop moves from 49.00 to 50.00 (stop to breakeven); a second sell 1/3 at 52.00 (2R), where the stop rises to 51.00; and a runner that trails up and is sold at 54.50. A table reads 100 × 1.00 = +100, 100 × 2.00 = +200 and 100 × 4.50 = +450, with the total highlighted as +750 = +2.5R and 1R for the whole position = 300 × 1.00 = 300.

Averaging down is not scaling in

Averaging down means buying more as a trade falls, to lower the average price. It looks like scaling in, but it is the opposite: the size grows exactly when the market says the idea is wrong, and the stop usually gets ignored. The drawing below puts the two side by side.

Hypothetical: you plan 100 shares at $40.00 with a stop at $38.00, a $200 risk. At $38.00, instead of exiting, you buy 100 more. Your average is now $39.00 on 200 shares, and a further drop to $36.00 costs $600, three times the plan. The trading mistakes lesson lists it among the most expensive habits. If a setup really calls for entries at two prices, write both, plus one stop for the whole position, before the first order, and size it so that the full position at the stop costs no more than your normal risk.

Turn your phone sideways to read the drawing. Tap to close.

Two hand-drawn panels. Left, adding to a winner: price rises, and three buy triangles marked +100, +60 and +40 sit at higher and higher prices above a red dotted stop that steps up; note: the stop moves up, risk stays capped. Right, averaging down a loser: price falls, and three buys of +100 each sit lower and lower, with a grey dashed average cost line above the latest prices and a red ✗ marked stop ignored; note: size grows while the trade is wrong.

Is scaling out worth it? The trade-offs

Scaling out shrinks your biggest wins. In the example above the plan made +2.5R; selling all 300 shares at the 2R target would have made +2R, and holding all of them to the $54.50 exit +4.5R. Its benefit shows on the trades that fail after the first target: if price falls back to $50.00 right after the first sale, the trade still ends at +$100 (+0.33R) instead of a loss.

Whether that is worth it depends on your risk/reward ratio and on you. Many traders find a runner easier to hold once part of the gain is banked; others find that partial exits quietly cap the big winners their method needs. Scaling also has practical costs: more orders, more spreads and commissions where charged, and a position large enough to split. Write the rules into your trading plan and judge them on the whole position’s result in R, not part by part.