Implied Volatility (IV) Percentile is a measure used to compare the underlying's current IV (as an average of all available options contract pricing) to historic values, which range defaults to the past year.
IV Percentile is always given in a range between 0-100 which corresponds to the number of historic values in the time range with an IV lower than the current IV.
For example, if the IV Percentile of the underlying is currently 64% then 64% of IV values for the underlying over the past year were less than the current IV.
It's important to note the difference between IV Percentile and IV Rank, as these two terms are often confused. IV Rank tells you at what percentage in the range of lowest to highest IVs the current IV stands while the IV Percentile tells you the percentage of days that historic IV was less than current IV.
IV Percentile is an important measure which should be included in most Brutus Options Ranker strategies. Alternatively, IV Rank can also be used.
The criterion helps us understand if the current pricing of options on the underlying (creating IV) is relatively high or low vs. a 52-week range. Therefore, the target will vary based on the type of option setup we use in our strategy, namely: