IV Percentile provides insight as to how the current IV for a given term compares to a 1-year history of previous IVs for the same term.

Consider an example 5-day history where the 10d IV has had the following ordered values: 20, 25, 25, 40, 50):

The following represents IV Percentiles for hypothetical "current" 10d IVs:

10d IV Number Of Days Below IV Percentile
20 0/5 0%
26 3/5 60%
32 3/5 60%
38 3/5 60%
44 4/5 80%
50 4/5 80%

See also: IV Rank