Expected Move: The Underlying's Expected Price Range

Expected Move complements structural levels like the Flip, the Call Wall, and the Put Wall (/docs/call-wall-put-wall-explained), adding a probabilistic frame for how far price can travel during the session.

It calculates the same way for any index, future, or stock you trade on the platform, using that underlying's current options chain.

What Expected Move Is

Expected Move is the underlying's expected price range for the session or the day, calculated from the implied volatility of the options currently trading. It represents how far price can travel, up or down, within that horizon.

How It Is Calculated

$$EM = P \times IV \times \sqrt{\frac{t}{365}}$$

Where:

$EM$: expected move, in points or dollars of the underlying.
$P$: the underlying's current price.
$IV$: annualized implied volatility, as a decimal (for example, 0.18 for 18%).
$t$: days remaining until expiration or until the close of the session being measured.

Another common way to estimate it takes the price of the at-the-money straddle (the call and the put at the strike closest to price) and adjusts it by a factor near 0.85, as an approximation of a one standard deviation move.

How to Read the Range

The range is built by adding and subtracting the Expected Move from the underlying's current price. For example, if the underlying trades at 19,900 and the day's Expected Move is 150 points, the expected range runs from 19,750 to 20,050.

flowchart TD
    A[Underlying current price] --> B[Upper bound, price plus expected move]
    A --> C[Lower bound, price minus expected move]
    B --> D[Session expected move range]
    C --> D

That range marks an upper and a lower reference boundary. A move that stays inside the range corresponds to a session within what the options market priced in. A move that clears either boundary signals a session with more range than the market had priced.

Relationship to Structural Levels

When the upper or lower boundary of the Expected Move lines up with the Call Wall, the Put Wall, or one of the GEX Levels 1-10, that point gains added relevance, combining a statistical range reference with a structural gamma reference.

Key idea: Expected Move turns implied volatility into a concrete number of points, useful for sizing the session's likely range before looking at the gamma levels.

The next concept is Buy/Sell Pressure, the real-time options order flow. Continue with Buy/Sell Pressure