Options tool

Expected Move Calculator

Estimate the expected move from implied volatility or an at-the-money straddle, useful for 0DTE and short-dated planning. It is a range from market pricing, not a call on direction.

Options tool

Calculate the range

Intraday 0DTE: hours remaining ÷ 6.5.

Expected move 1σ

±47.11 pts

±0.79% · IV formula · 1 SD approximation

1σ range ~68%
5,952.89 – 6,047.11
2σ range ~95%
5,905.78 – 6,094.22
2σ move
±94.22 pts

The straddle is the market’s own price for the move; the IV formula approximates one standard deviation. Both are statements about pricing, not predictions. The page computes an implied range from the inputs you enter; it does not predict price and is not a recommendation.

A practical read

Start with the market’s price for the move

An expected move is the range options are implying for a specific expiration. Traders often use it to frame levels, compare strikes, and keep a 0DTE idea in context. It does not say whether price should go up or down.

The at-the-money straddle is usually the cleanest read because it is the market’s own price for the move: the call premium plus the put premium at the strike nearest the underlying. The implied-volatility method is useful when you want a quick approximation or do not have a straddle price.

Worked SPX example · straddle method

With SPX at 6,000 and an at-the-money straddle priced at 90, the expected move is approximately ±90 points, or ±1.50%. That frames a 5,910–6,090 range for the expiration.

The calculation

How to calculate expected move

Method A: at-the-money straddle

Add the price of the at-the-money call and put for the expiration you are watching. If an SPX 6,000 call is priced at 46 and the 6,000 put is priced at 44, the straddle is 90. Add and subtract that 90-point estimate from 6,000 to frame a 5,910–6,090 range.

Method B: implied volatility and time

The approximation is underlying price × implied volatility × √(days to expiry / 365). For SPX at 6,000, 15% implied volatility, and seven days to expiry, the estimated move is about 124.64 points. Unlike a quoted straddle, this is a simplified calculation, so it will not always match the options market exactly.

The two-sigma row on the calculator is that figure doubled. In the same normal-distribution framing it covers roughly 95% of outcomes, which is why it is a wider range and not a safer one.

How SPX traders use expected move

Expected move is a reference, not a boundary. A trader may compare it with premarket levels, a planned strike, or the distance to a known area of interest. Around 0DTE, the range can help put a fast move in perspective: an early push near the estimated range is different from an ordinary move near the open.

It can also help with strike selection. A strike well outside the estimated range may need a larger-than-implied move to matter at expiry. A strike inside it may have more sensitivity but carries different premium and risk. Those are tradeoffs, not a recommendation.

What expected move cannot tell you

It does not identify trend, timing, a support or resistance level, or a safe trade. The range can be exceeded, especially around scheduled events and sudden headlines. It also changes as options prices and time change. Use live quotes and your own risk process.

For more context, read the SPX trading strategy framework and the GEX guide, which covers the dealer-hedging levels the range is usually read against. Working in SPY instead of SPX, the SPY/SPX converter translates a price or a range between the two.

Inside the Alpha Pod membership, the Morning Note frames the session’s expected move against the GEX levels before the open, and every alert carries the thesis behind it. If you want to see the range applied rather than computed, the get started page explains how the desk works; the membership is $129/mo after a 7-day trial.

FAQ

Expected move questions

An expected move is the market-implied range around an underlying price for a chosen expiry. It can be estimated from the at-the-money straddle price or from implied volatility and time to expiry.

No. It is a range derived from options prices, not a directional forecast. Price can stay inside the range, touch it, or move beyond it.

The straddle method uses the market price of the at-the-money call and put. The IV method is a simplified time-and-volatility approximation, so the two can differ.

In the simplified normal-distribution framing used for options, a one-standard-deviation range contains roughly 68% of outcomes. That describes a statistical model, not what will happen on a particular expiration.

Yes. Enter the underlying price and either the at-the-money straddle price or implied volatility with days to expiry. Confirm the live options inputs yourself before making any trading decision.

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