Volatility Cone & Percentile Analyzer
Visualize historical volatility ranges across multiple time windows and compare current implied volatility against its historical distribution. Determine whether options are relatively cheap or expensive to guide your trading strategies.
Enter a ticker and click "Analyze"
The volatility cone chart will appear here
Understanding the Volatility Cone & IV Percentile
What Is a Volatility Cone?
A volatility cone is a visualization tool that displays the statistical distribution of historical realized volatility across multiple time windows. By plotting percentile bands (10th, 25th, 50th, 75th, 90th) for each lookback period (10 days to 1 year), it creates a cone-shaped chart that shows the typical range of volatility a stock has experienced. Traders use this to contextualize current volatility levels and identify whether a stock is in a historically high or low volatility regime.
How Is Historical Volatility Calculated?
Historical volatility (HV) is computed from daily log returns of closing prices. For each time window (e.g., 30 days), we calculate the standard deviation of log returns over that period, then annualize it by multiplying by the square root of 252 (trading days per year). This process is repeated using a rolling window across the entire historical dataset (typically 2 years) to generate a distribution of HV values for each window size.
What Is IV Percentile Rank?
IV Percentile Rank measures where the current implied volatility stands relative to its historical range over the past year. An IV percentile of 80% means that the current IV is higher than 80% of all IV readings over the past 12 months. This metric is widely used by options traders to assess whether options premiums are relatively expensive or cheap compared to recent history, helping to time strategies like selling premium when IV is high or buying when it is low.
How to Use This Tool for Options Trading
Selling Premium (High IV Percentile): When the IV percentile is above 75% and the current HV line sits near the top of the volatility cone, options are historically expensive. This favors strategies like iron condors, credit spreads, and covered calls that benefit from volatility contraction.
Buying Premium (Low IV Percentile): When the IV percentile is below 25% and current HV is near the bottom of the cone, options are historically cheap. This favors long straddles, long strangles, or debit spreads that benefit from volatility expansion.
HV vs IV Divergence: When implied volatility significantly exceeds historical volatility, the market is pricing in more future movement than has been realized. This IV premium often reverts, creating opportunities for volatility sellers. Conversely, when IV is below HV, options may be underpriced.
Reading the Volatility Cone Chart
The cone chart displays percentile bands that widen for shorter time windows and narrow for longer ones, reflecting how short-term volatility is more variable than long-term. The red line shows where current realized volatility sits within these historical bands. If the red line is above the median (purple) across most windows, the stock is in a higher-than-normal volatility regime. If it is below, the stock is experiencing unusually calm price action.
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Frequently Asked Questions
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