Every option chain shows the same temptation. The strikes far from the current price cost very little. A few dollars of premium looks like a small risk. The question to ask before buying one is what has to happen for it to pay, and the expected move answers that in one comparison.

What the expected move is

The expected move is the range the options market is pricing for the session. It comes from option prices themselves. It is the market’s own estimate of a typical day, stated as a distance above and below the current price. The expected move explains how it is derived.

It is a measure, not a limit. Price finishes outside it on some days. On most days it does not.

The comparison

Take the strike you are looking at. Work out how far it is from the current price, as a percentage. Set that beside the expected move.

On 2 October 2026 SPY’s expected daily move was 0.46%. A strike half a percent away was at the edge of what the market priced for the whole day. A strike one percent away needed a move of more than twice that size. The second option was much cheaper, and now the reason is visible. The market was pricing it as unlikely to matter.

Inside, at the edge, outside

A strike inside the expected move is asking for an ordinary day. It costs more because an ordinary day is likely.

A strike at the edge is asking for a full-sized day in your direction. The whole expected range has to be used, and used on your side.

A strike outside is asking for an unusual day. It can pay many times its cost, and that is the pull. Most of the time it expires worthless, and that is why it is cheap. Neither fact is hidden. The comparison only puts them next to each other.

Add the time of day

The expected move covers the full session. If half the session is gone, less time remains for the move to happen. A strike that sat at the edge at the open is asking for more at one o’clock, because the same distance now has fewer hours to be covered. Same-day options lose value quickly for this reason. Check the comparison again whenever you consider a trade later in the day.

Add the walls

The expected move is a distance. The walls are places. Use both. If your strike is inside the expected move but beyond the call wall, the distance is ordinary and the path is not. Expected move versus gamma walls covers how the two fit together, and choosing a strike for a 0DTE scalp covers the trade-off between delta and cost.

Where to read it

The Trader dashboard shows the expected move on SPY, QQQ and IWM beside the flip and the walls. Read the figure, do the comparison, then open your broker’s chain. NoVo does not suggest a strike. It shows the range the market is pricing. Choosing is your part.