The expected move, explained
The expected move is how far the options market is priced to move an underlying over a given period. This page explains what that number represents, where it comes from, and how it appears on a chart as market-structure context — not as a forecast or a boundary.
This page explains the concept. It shows no live numbers — the live map lives in the indicator, on TradingView and ATAS. Educational context only, not a signal.
What the expected move is
The expected move is the options-implied one-standard-deviation range for a chosen period, whether that is a single session, a week, or the span to an event. It is derived from at-the-money implied volatility and is closely approximated by the price of the at-the-money straddle — the combined cost of the ATM call and put. Because that premium reflects what participants are collectively willing to pay to hedge or speculate on movement, it encodes the market's priced expectation of range around the current price.
Read as a band, the expected move brackets the underlying with an upper and lower bound. The one-standard-deviation framing means that, under the assumptions embedded in the pricing model, roughly two-thirds of outcomes would be expected to fall inside the range and about one-third outside it. The implied move scales with time and with the level of implied volatility: a higher ATM IV or a longer horizon widens the band, while a lower IV or a shorter horizon narrows it. As the options chain reprices through the session, the number changes with it.
Why it matters as context
The expected move is useful because it frames price against what the options market is actually pricing, rather than against an arbitrary level. Seeing where the current price sits relative to a one-standard-deviation band gives a sense of scale — whether a given day's range is small or large compared with what implied volatility suggested going in. That is descriptive context about positioning and priced risk, not a prediction of direction.
As an expected move band on the chart, GEX Levels plots this range alongside dealer-positioning levels such as the Call Wall, Put Wall, and Gamma Flip, so the implied range can be read together with where gamma and hedging concentrate. Like every level in the indicator, it is a snapshot: it reflects the options chain at the moment it was computed and goes stale as implied volatility and the chain evolve, which is why the levels refresh each session. It is context to read the tape against — not a signal, a recommendation, or a promise about where price will go. Trading options and futures involves substantial risk of loss.
Common misconceptions
The band describes a probabilistic range, not a level price is trying to reach. Reaching the edge of the expected move is a normal outcome, not a destination the market is drawn toward.
Price breaks beyond the one-standard-deviation range regularly — that is exactly what the remaining roughly one-third probability outside the band represents. A move outside the expected move is not an anomaly or an error.
The expected move is symmetric around current price and says nothing about which way the underlying will go. It measures priced magnitude of movement, not bias, and it is not a signal to act on.
Questions traders ask.
How is the expected move calculated?
It is derived from at-the-money implied volatility for the period, scaled by time. A common practical approximation is the price of the at-the-money straddle — the combined ATM call and put premium — which stands in for the one-standard-deviation range the options market is pricing.
Does the expected move predict where price will go?
No. It is a probabilistic band describing how far the market is priced to move, not a forecast of direction or a target. It is descriptive context about priced risk, not a signal or a guarantee.
Why does the expected move change during the day?
Because it is built from live implied volatility and the options chain, both of which reprice continuously. As IV rises or falls and time passes, the implied move widens or narrows, so any plotted band is a snapshot that goes stale and is refreshed each session.
What does one standard deviation mean here?
It refers to the range within which, under the pricing model's assumptions, roughly two-thirds of outcomes would be expected to land. About one-third of the time price finishes outside the band, which is why breaks beyond it are ordinary rather than exceptional.
Is this a buy or sell signal?
No. Everything on this page describes option-market structure — where dealer hedging concentrates — which is context on how a session is likely to behave, not a recommendation to buy or sell and not a prediction of direction. Educational and informational only; trading involves substantial risk of loss.
Where do the live levels come from?
The GEX Levels indicator computes them from the live options chain and draws them on your TradingView or ATAS chart, refreshed each session. This page explains the concept; the live map lives in the indicator, and the free Morning Map shows the prior session's index levels each day.
See it on your chart.
The concept is free to read. The live levels — call wall, put wall, gamma flip, the second-order greeks, the regime and more, refreshed every session — are built into the GEX Levels indicator for TradingView and ATAS. The free Morning Map shows the prior session's index levels each day.
Related: Vega exposure and vega walls · The GEX profile: net dealer gamma by strike · Gamma levels: the map of dealer positioning · What is GEX · Levels by ticker