What is IV Rank? Definition, Formula, and Example
IV Rank (IVR) measures where a security's current implied volatility sits relative to its 52-week high and low, expressed as a 0–100 score where 100 means IV is at its annual peak.
What is IV Rank?
IV Rank (IVR) measures where a security's current implied volatility sits relative to its 52-week high and low, expressed as a 0–100 score. An IV Rank of 100 means current implied volatility is at its highest point of the past year; an IV Rank of 0 means it is at its lowest. IVR answers a single question that raw IV cannot: is implied volatility elevated or depressed right now compared to where it has been?
Formula
IVR = (Current IV − 52-Week IV Low) ÷ (52-Week IV High − 52-Week IV Low) × 100
The result is always between 0 and 100, regardless of the underlying asset's absolute IV level.
Worked Example
AAPL reports quarterly:
- 52-week IV high: 48
- 52-week IV low: 17
- Current IV (day before earnings): 41
IVR = (41 − 17) ÷ (48 − 17) × 100 = 24 ÷ 31 × 100 ≈ 77
An IVR of 77 means AAPL's options are pricing in volatility at the 77th percentile of the past year — options are relatively expensive. A premium seller (short strangle, iron condor, cash-secured put) would view this as a favorable entry; an options buyer is paying above-average premium.
IVR vs. IV Percentile — They Are Different
Many platforms display "IV Percentile" and label it as IVR — these are distinct calculations. IV Percentile counts how many trading days in the past 252 sessions had IV *below* today's level, then divides by 252. A stock with one extreme IV spike in the past year will have a very high IVR (because that spike sets the denominator high) but a moderate IV Percentile (because most days still had lower IV than today). IV Percentile is more robust when a single event distorts the 52-week range; IVR is simpler and more widely cited.
When Traders Use It
Options premium sellers (volatility sellers) screen for IVR above 50 — ideally above 30 at minimum — to ensure they are selling options when premiums are inflated relative to the asset's own history. Selling premium when IVR is 10 means collecting below-normal credit for the same risk.
Options buyers look for IVR below 20 to enter directional positions (calls, puts, debit spreads) at below-average cost. Buying options with IVR above 70 is paying a significant premium for vega exposure that collapses after the catalyst resolves.
IVR is commonly combined with VIX readings: a stock with IVR of 80 while VIX is at 12 suggests the stock-specific event risk (not market-wide fear) is the driver of elevated premiums.
Limitations and Common Misconceptions
IVR is backward-looking. A reading of 90 does not guarantee IV will revert downward — it means IV is near its annual high, which can persist or continue rising if the underlying catalyst is ongoing. A stock in regulatory trouble or with recurring quarterly beats can hold high IVR for months.
A single extreme outlier event (a 50% gap on a takeover bid) can pin a stock's IVR at or near 100 for the following 52 weeks even when current options are priced at entirely normal levels. In that case, IV Percentile better reflects the true landscape.
IVR also says nothing about the *direction* of the underlying — high IVR indicates expensive options, not that the stock will fall.