Expected Move Calculator

What Is Expected Move?

The Expected Move (sometimes called the implied move) is the market-implied price range for a stock before its nearest options expiration. It answers the question: "How much does the options market think this stock will move between now and expiration?"

It is derived from the price of the at-the-money (ATM) straddle — the combined cost of buying both a call and a put at the same strike price and expiration. When options traders price a straddle, they are implicitly pricing in how much movement they expect. The more expensive the straddle, the larger the expected move.

Expected move is one of the most widely used tools among professional options traders, market makers, and institutional investors for assessing risk, sizing positions, and identifying potential trading opportunities.

How Expected Move Is Calculated

There are two standard methods for calculating the expected move from straddle pricing:

Method 1 — Full Straddle:	Expected Move = (Call Bid + Call Ask) / 2 + (Put Bid + Put Ask) / 2
Method 2 — 85% Rule:	Expected Move = Straddle Midpoint × 0.85

Method 1 uses the full straddle midpoint price. This gives you the maximum expected move — the point at which a straddle buyer would begin to profit. If the stock moves more than this amount, the straddle buyer makes money. If less, the straddle seller profits.

Method 2 (the 85% Rule) is the more commonly used institutional convention. By multiplying the straddle midpoint by 0.85, you get a tighter range that historically contains the stock's actual move approximately 68% of the time — equivalent to one standard deviation in a normal distribution. This method is favored by market makers and professional traders because it provides a more realistic probability-based range.

Why the ATM Straddle?

The at-the-money straddle is used because it captures the market's aggregate expectation of movement in both directions. Unlike a single call or put, which only reflects one-sided risk, the straddle prices in the total expected magnitude of the move regardless of direction. The ATM strike is chosen because it has the highest gamma and vega exposure, making it the most sensitive to changes in the underlying stock price and implied volatility.

Expected Move and Earnings Announcements

Expected move is especially valuable before earnings announcements. Ahead of earnings, implied volatility typically increases significantly as the market prices in the uncertainty of the report. This causes straddle prices — and therefore expected moves — to expand.

Traders use the expected move to:

• Compare to historical earnings moves — If the expected move is 8% but the stock has historically moved only 4-5% on earnings, options may be overpriced (favoring sellers). If historical moves are 12%, options may be underpriced (favoring buyers). You can review a stock's historical data using SmartHistoryXL™ Back Testing.
• Set strike prices for credit spreads and iron condors — Selling options outside the expected move range means the market considers those strikes unlikely to be breached.
• Size positions — Knowing the expected range helps determine how much capital to risk on an earnings trade.
• Evaluate risk/reward — A straddle buyer needs the stock to move beyond the expected move to profit. A seller profits if it stays within the range.

Use the "Earnings Within" filter in the screener above to find stocks with upcoming earnings where the options market is pricing in a significant move. You can also view this week's Earnings Report for a complete list.

Understanding IV Rank

IV Rank (Implied Volatility Rank) shows where current implied volatility sits relative to its own 52-week range, expressed as a percentage from 0% to 100%. For a dedicated screening tool, see the IV Rank & IV Percentile Screener.

• IV Rank = 0% means IV is at its 52-week low — options are as cheap as they've been all year.
• IV Rank = 100% means IV is at its 52-week high — options are as expensive as they've been all year.
• IV Rank > 70% (shown in red) is generally considered high, suggesting the expected move may be overstated and favoring premium sellers.
• IV Rank < 30% (shown in green) is generally considered low, suggesting options are cheap and the expected move may be understated.

IV Rank is crucial context for expected move analysis. A 10% expected move at 90% IV Rank has very different implications than a 10% expected move at 15% IV Rank.

Understanding IV/HV Ratio

The IV/HV Ratio compares implied volatility (what the market expects) to historical volatility (what has actually happened). This is one of the most important metrics for determining whether options are fairly priced.

• IV/HV > 1.5x (shown in red) — The market expects significantly more movement than has historically occurred. Options are likely overpriced. This premium often collapses after a catalyst (like earnings) passes, a phenomenon known as volatility crush.
• IV/HV = 1.0x - 1.5x (shown in orange) — A slight premium exists, which is normal. The market always prices in some degree of forward uncertainty beyond what has already occurred.
• IV/HV < 1.0x (shown in green) — Unusual. Implied volatility is below historical volatility, suggesting options may be underpriced. This can happen after a sharp move when IV hasn't caught up, or in low-attention names.

Understanding Put/Call Skew

Put/Call Skew measures the percentage difference between the put midpoint and the call midpoint of the ATM straddle. It reveals which direction the market is leaning. For a deeper analysis of volatility skew across strike prices, see the Volatility Skew tool, or review overall market direction with Market Sentiment.

• Positive skew (> 10%) shown in red — Puts are more expensive than calls. This indicates bearish hedging, downside protection buying, or fear of a decline. Common before earnings for stocks that have run up significantly.
• Negative skew (< -10%) shown in green — Calls are more expensive than puts. This indicates bullish demand, upside speculation, or institutional call buying. Common in momentum stocks or ahead of anticipated positive catalysts.
• Neutral skew (-10% to 10%) — The market sees roughly equal probability of movement in either direction.

Skew is a sentiment indicator, not a directional predictor. High put skew doesn't mean the stock will go down — it means the market is paying more for downside protection, which often reflects institutional hedging rather than directional conviction.

Seller Probability (Sell Prob)

The Sell Prob column shows the probability that a straddle seller would profit — meaning the stock stays within the expected move range through expiration. This is derived from the combined probability calculations of the straddle's breakeven points.

A high seller probability (e.g., 65-75%) combined with a high IV Rank is a classic setup for premium selling strategies like short straddles, short strangles, or iron condors. However, keep in mind that selling straddles involves unlimited risk, and one large move can wipe out many small gains.

How to Use This Tool

Here are some common ways to use the Expected Move Calculator and Screener:

For Earnings Trades

1. Set the "Earnings Within" filter to 7 or 14 days to find stocks reporting soon.
2. Sort by Exp Move to see which stocks have the largest expected moves.
3. Click a symbol to see the full analysis including IV Rank, IV/HV, and skew.
4. Compare the expected move to the stock's historical earnings moves (available on the Stock Researcher page).
5. If the expected move seems too high (high IV Rank, high IV/HV), consider premium selling strategies.
6. If the expected move seems too low (low IV Rank), consider premium buying strategies.

For Covered Calls and Cash-Secured Puts

1. Look for stocks with moderate expected moves (5-15%) and high seller probability.
2. Sell calls or puts at or beyond the expected move range to maximize probability of keeping premium.
3. Use IV Rank to time entries — sell options when IV Rank is high to collect more premium.

For Iron Condors and Strangles

1. Use the expected move range to set your short strikes outside the expected range.
2. The 85% range gives you the one-standard-deviation boundary — selling outside this range means the market considers breach unlikely.
3. Higher IV Rank means you collect more premium for the same probability of success.

For Risk Management

• Use expected move to set stop-loss levels — if a stock moves beyond its expected range, something unexpected may be happening.
• Compare expected moves across your portfolio to identify your most volatile holdings.
• Use the probability cone to visualize best-case and worst-case scenarios at expiration.
• Consider using a collar to protect stock positions with large expected moves heading into earnings.

Color Coding Guide

● Red	High implied volatility, expensive options, bearish skew, or elevated metrics. May indicate options are overpriced or the market is fearful.
● Orange	Moderate levels. Within normal ranges but worth monitoring. Neither clearly overpriced nor underpriced.
● Green	Low implied volatility, cheap options, bullish skew, or depressed metrics. May indicate options are underpriced or the market is complacent.

These are relative indicators based on the stock's own history, not buy/sell signals. Always combine expected move analysis with your own research, risk tolerance, and trading plan.

Glossary

ATM Straddle	A position created by buying (or selling) both a call and a put at the same strike price (at-the-money) and expiration date. See Long Straddle and Short Straddle strategy guides.
Straddle Midpoint	The average of the bid and ask prices for both the call and put legs of the straddle, added together. Represents the fair market value of the straddle.
Implied Volatility (IV)	The market's forecast of how much a stock will move, derived from option prices. Higher IV = more expected movement = more expensive options. Screen by IV using the IV Rank Screener.
Historical Volatility (HV)	A measure of how much a stock has actually moved over a past period (typically 20-30 trading days). Used as a baseline to compare against implied volatility. View on the Stock Researcher page.
IV Rank	Where current IV sits between its 52-week high and low, expressed as a percentage. Formula: (Current IV - 52w Low) / (52w High - 52w Low) × 100.
Volatility Crush	A rapid decline in implied volatility, typically occurring after a known event (like earnings) passes. Causes option prices to drop sharply even if the stock doesn't move much.
Volatility Skew	The pattern of implied volatility varying across different strike prices for the same expiration. Analyze with the Volatility Skew tool.
Standard Deviation	A statistical measure of dispersion. In options, one standard deviation corresponds to the range within which the stock is expected to trade approximately 68% of the time.
Open Interest	The total number of outstanding option contracts that have not been settled. High open interest indicates an actively traded option with tighter bid-ask spreads and more reliable pricing. View on the Option Chain.
Gamma	The rate of change in an option's delta per $1 move in the underlying stock. ATM options have the highest gamma, making them most sensitive to stock price changes. See the full glossary for more.
Vega	The sensitivity of an option's price to a 1% change in implied volatility. ATM options have the highest vega, making them most sensitive to IV changes.
Black-Scholes	The foundational options pricing model used to calculate theoretical option values based on stock price, strike price, time to expiration, volatility, and interest rate. Try the Black-Scholes Calculator.

Disclaimer: Expected move calculations are based on current market data and reflect the options market's consensus expectations. They are not predictions or guarantees of future stock price movement. Past performance of expected move accuracy does not guarantee future results. Options trading involves significant risk and is not suitable for all investors. Always consult with a qualified financial advisor before making investment decisions.