Position scaling is a risk management tool used to secure a median entry in a support zone. No one can ever know the exact top or bottom consistently, so in order to get better entries in positions, its best to scale in multiple entries within a zone. Generally getting more aggressive the lower the price is in the zone. This way we can secure a median position. If a position is "25% Scaled in" it means that 25% of available capital is long/short. The % scaled in reflects the confidence of the move. In the example to the left of us, the price range to scale in is $16,475 - $16,210. This may seem like a wide range, but the range is in response to the move. I would put 10% around $16,475, 15% more in at $16,400 25% more at $16,300 and the remaining 50% at the $16,210 level. You won't always get all your limit orders in, but this way you'll still have some skin in the game for the next move.