Most market forecasts are opinions. There is one that is not: the options market publishes, continuously, the distance it expects the index to travel — and reading it takes a single addition. That number is the expected move, and it is the most under-used figure on a trading screen.
In the screenshot it is ±229.10 points by expiry, or 0.96% of spot, framing a band from 23559.15 to 24017.35.
Where the expected move comes from
Take the at-the-money strike. Add the call price to the put price. That sum — the ATM straddle — is the expected move.
The logic is short. Someone buying the straddle profits only if the index finishes further than the premium paid, in either direction. Someone selling it profits if it finishes closer. Both sides are free to walk away, so the price they agree on is the market’s honest estimate of the total distance to expiry. Buy the 23800 call at 118 and the 23800 put at 111 and the market is telling you it expects roughly 229 points of movement.
The band is then simply spot ± the straddle. Anything nearer than that and premium sellers win; anything further and buyers do.
Two properties follow immediately, and both matter:
It contracts on its own. Time value drains as expiry approaches, so the straddle shrinks even on a completely still market. The expected move is a range to a specific date, and that date is doing a lot of the work — which is why the screenshot labels it “by Tue, 28 Jul” rather than leaving it open-ended.
It is directionless. ±229 points says nothing about which side. It is a statement about distance only. A straddle is the purest expression of that view, and the strategy mechanics are covered in straddles and strangles.
Reading it as a probability, roughly
The convention is that the expected-move band brackets somewhere around a one-standard-deviation outcome — so, loosely, the index finishes inside it about two thirds of the time and outside it about a third.
Treat that as an order of magnitude, not arithmetic. The straddle is not exactly one standard deviation, index returns are not normally distributed, and Indian index options carry a persistent volatility skew that makes the downside fatter than the upside. The honest version: inside is the base case, outside is common enough that you must be solvent when it happens.
Four ways it is actually useful
Sizing a directional trade. If you are buying a weekly option on a view that NIFTY moves 300 points, and the expected move is 229, you are betting on an above-average move — payable, but not the base case. If your view is 80 points, the option market is charging you for nearly three times the movement you expect, and you are structurally on the wrong side of the price.
Sanity-checking a target. A target outside the expected-move band by expiry is not impossible, it is just an outlier bet, and should be sized as one. This one habit prevents a lot of weekly-option losses.
Judging whether options are expensive. Compare the expected move to what the index has actually been doing. If the band implies 0.96% and realised movement has been running at 0.5%, sellers are being paid well for risk that has not been showing up. That comparison — implied against realised — is the variance risk premium, and the volatility page computes it directly.
Framing expiry day. On the final session the expected move collapses toward zero, which is why expiry-day ranges are usually narrow and why the exceptions are violent. Reading it alongside straddle decay is the core of expiry day trading.
Expected move against max pain and the walls
The dashboard deliberately puts three different things side by side, and they answer three different questions.
The expected move says how far, symmetrically, priced by the options market. Max pain — 23900 in the screenshot, 112 points above spot — says where option writers would prefer expiry to land. The OI walls at 23000 and 25000 say which strikes carry the heaviest open interest.
Read together they frame a session properly: the expected move gives you the plausible range, max pain gives you the drift within it, and the walls give you the levels where that range is most likely to stall. Note that these OI walls sit far outside the expected-move band — 25000 is roughly a thousand points above a band topping out at 24017 — which is a useful reminder that heavy far-out open interest is positional rather than a level today’s session will test. The gamma-weighted version of those walls sits much closer, as covered in gamma exposure.
Where it misleads
A stale basis reads as a forecast. When the market is shut, the band is computed from the last available snapshot. The screenshot says “prior session close (2026-07-24)” for exactly this reason. A weekend expected move is Friday’s opinion, not Monday’s.
Events break it. A budget, a policy decision or a result inside the window means implied volatility already contains a jump that the symmetric band represents badly.
It is not a barrier. Nothing stops price at the edge of the band. It is a price, not a level — no support, no resistance, no defence.
Widening is information. A band that expands without spot moving means implied volatility is being bid: the market is paying up for protection or for movement it has not seen yet. That is often the most useful thing the number does all week.
On OIData
The Dashboard leads with the expected move for NIFTY — the points figure, the percentage of spot, the resulting band and the expiry it runs to — with max pain and both OI walls beside it, and a shareable card. Expiry Day plots the same band around spot through the session and tracks the ATM straddle against a square-root-of-time decay model, and Straddles & Strangles charts the straddle premium the figure is derived from.
Takeaways
- The expected move is the ATM straddle price; the band is spot ± that number.
- It states distance to a date, never direction, and it shrinks as expiry approaches.
- Roughly a two-thirds-inside band — an order of magnitude, not a precise probability.
- Use it to size trades, sanity-check targets and judge whether premium is expensive.
- A band widening on a still market means volatility is being bid, which is worth noticing.