What is an expected move?

The expected move is the magnitude of price change the options market is pricing in for a given underlying by a specific expiration date. It is derived from the cost of the at-the-money straddle and represents a one-standard-deviation move in either direction.

Does the expected move predict direction?

No. It tells you the magnitude the market is pricing — how far up or how far down — but it makes no statement about which way the move will go. Expected move is a sizing tool, not a directional signal.

How is expected move calculated?

A common approximation is the price of the at-the-money call plus the at-the-money put for the target expiration. That total is the expected dollar move; dividing by the underlying price gives the expected percentage move.

Why does the expected move change during the day?

Implied volatility on the relevant options contracts changes as new information arrives, as positioning shifts, and as time decays. Expected move is a real-time read on what the options market is pricing right now.

Concept6 min read

Expected move, explained: what the options market is pricing in

Updated April 28, 2026

The expected move is one of the most useful single numbers a retail trader can read off the options market. It tells you, in dollars and percent, the magnitude the listed options market is currently pricing in for an underlying by a specific expiration. It does not predict direction. It tells you how far the market is paying for protection in either direction, which is exactly the number you need to size risk against.

The intuition first

When you buy an at-the-money call and an at-the-money put on the same underlying, with the same expiration, you have constructed a long straddle. You profit if the underlying moves far enough in either direction to overcome what the two contracts cost. The price of that straddle is the market\'s consensus answer to the question: how much will this thing move?

A SPY straddle expiring Friday that costs $4.00 is the market saying SPY is expected to move roughly $4.00 by Friday\'s close. If SPY is at $500, that is a 0.8% expected move. Whether it moves up $4.00, down $4.00, or stays flat is a separate question the straddle does not answer.

Why this is useful

Three concrete uses, in order of how often you should think about them:

1. Sizing

If the expected move on SPY by Friday is 0.8%, putting on a directional position with a 2% target is asking for 2.5x the move the market is pricing. That trade can still work, but you are betting against the consensus magnitude — not just direction. Knowing the expected move puts an honest number on what "outsized" means in the current regime.

2. Risk floor

A stop placed inside the expected move is a stop that will be tagged often even if the underlying ends the week roughly where it started. Setting your stop slightly outside the expected move — when your strategy and account size allow — is one way to avoid being whipsawed by routine intraday range.

3. Regime context

The expected move expands and contracts. A weekly SPY expected move of 0.6% in one regime can be 1.8% the week of an FOMC announcement or a CPI release. The relationship between expected move and recent realized move tells you whether the options market is pricing tomorrow as more or less eventful than recent days have been.

Common misreadings

"Expected move means I expect a move that big." No. It is a one-standard-deviation estimate, meaning the underlying is expected to move within that range about two-thirds of the time and beyond it about one-third. Outsized moves are normal — they are roughly a third of all weeks.
"If price is inside the expected move, I should buy options." The expected move is the consensus price. If you buy the straddle, you are paying for that consensus. Profit comes from the realized move exceeding the implied move — which is a vol-trading edge, not a directional one.
"Expected move predicts the daily range." The expected move corresponds to a specific expiration. A weekly expected move tells you about the week. Reading it as a daily range without scaling by time is a common error.

Frequently asked questions

What is an expected move?: The expected move is the magnitude of price change the options market is pricing in for a given underlying by a specific expiration date. It is derived from the cost of the at-the-money straddle and represents a one-standard-deviation move in either direction.
Does the expected move predict direction?: No. It tells you the magnitude the market is pricing — how far up or how far down — but it makes no statement about which way the move will go. Expected move is a sizing tool, not a directional signal.
How is expected move calculated?: A common approximation is the price of the at-the-money call plus the at-the-money put for the target expiration. That total is the expected dollar move; dividing by the underlying price gives the expected percentage move.
Why does the expected move change during the day?: Implied volatility on the relevant options contracts changes as new information arrives, as positioning shifts, and as time decays. Expected move is a real-time read on what the options market is pricing right now.