IV Percentile

The percentage of days over the past year where implied volatility was lower than it is today — a measure of how elevated current IV is in a historical context.

IV Percentile (sometimes called IV Rank Percentile to distinguish from IV Rank) measures what percentage of trading days in the past year had lower implied volatility than today's reading. If IV Percentile is 80, it means that 80% of the days in the past year had lower IV than today — current IV is in the top 20% of its annual distribution.

The key difference from IV Rank is robustness to outliers. Suppose a stock had one day of extreme 200% IV during a short squeeze, and current IV is 40%. IV Rank might read very low (40% is near the bottom of the 40%–200% range). But IV Percentile would read high if the vast majority of days had IV below 40% — capturing the reality that today's IV is elevated compared to typical conditions.

For practical options trading, IV Percentile above 50% is generally considered elevated enough to favor selling strategies (covered calls, cash-secured puts, iron condors). Below 25%–30% is often considered low enough to favor buying strategies. Neither metric is perfect and both should be interpreted alongside the absolute IV level and the catalyst environment — during earnings season, high IV may be entirely justified by the upcoming binary event.

This definition is for informational and educational purposes only. Nothing on Finance Compass constitutes financial, investment, or trading advice. Always conduct your own research and consult a qualified professional before making financial decisions.