Options traders throw around "IVR" and "IVP" as if they mean the same thing. They do not. IV Rank and IV Percentile measure different things, and using the wrong one will bias your entries. The distinction matters most in two very specific market regimes — this article explains which to trust when.

Different Questions, Different Answers

IVP
IV Percentile — % of days below today
"On what fraction of the last 252 trading days was IV lower than today's IV?" Pure frequency — if IV has ever been much higher, those days are in the count but don't stretch the scale.
IVR
IV Rank — position in the min/max range
"Where is today's IV between the lowest and highest IV in the last 252 days?" Bounded by extremes — one huge spike a year ago pins the top of the scale forever.

The Regime Where They Disagree

Imagine a stock whose IV sat at 20-25% for 11 months, then had one earnings-related spike to 80% for a week, then drifted back to 22%. Today IV is 30%.

  • IVP says ~85%: 30% is higher than almost every other day in the year. Options look rich.
  • IVR says ~13%: 30% is close to the bottom of the 22-80% range. Options look cheap.

Both are mathematically correct. They answer different questions. IVP is answering "how unusual is today's reading by frequency?" IVR is answering "how far up the extreme range is today?"

For premium-selling decisions on steady dividend names, use IVP. You care about typical behaviour, not the worst day of the year. For event-driven trades around earnings or news, use IVR — you care about how close you are to that spike.

The App's Default and Why

AI Stock Monitor's IV signals use IVP by default. The user base is weighted to income-focused dividend / blue-chip investors whose holdings rarely have the kind of single-day IV spikes that dominate IVR calculations. IVP gives them a cleaner "is today unusual?" read.

The volatility page shows both numbers for every ticker — if you are trading event-driven names, switch your visual scan to the IVR column. The data is there; the default just reflects what most users need most of the time.

IVP = % of days below today
IVR = position between 52-week min and max
Dividend names → IVP · event-driven → IVR · both shown per ticker

Open the Volatility page →