What is IV rank, and how does OptionIncomeTools approximate it?
IV rank measures where current implied volatility sits in its 52-week range as a percentile (0–100); OptionIncomeTools currently uses a recent-realized-volatility proxy as an approximation until the full 52-week historical IV series is captured per ticker.
Formula
(current IV − min 52wk IV) ÷ (max 52wk IV − min 52wk IV) × 100OptionIncomeTools approximation: ratio of current realized volatility (recent 30-day, annualized) to the trailing 12-month average, scaled to 0–100.
Worked example
TSLA 30-day realized volatility is currently 48% annualized. Trailing 12-month average realized volatility is 40%. IV-rank approximation = (48 − 25) ÷ (75 − 25) × 100 = 46 (placeholder normalization).
Common misinterpretation
Treating the IV-rank approximation as actual IV rank. The proxy correlates with true IV rank but is not identical — it tends to understate IV rank when implied volatility lags realized.
Limitations
- Approximation only — replace with true historical IV rank when 52-week IV history is available.
- Does not capture term structure (front-month vs back-month IV).
- For underlyings with infrequent options trading, the proxy is unreliable.
Tools that use this metric
Primary references
References cite the source institution where the underlying definition or rule is published. OptionIncomeTools does not redefine standardized options terms; it ranks and presents data using widely accepted definitions.
Related glossary entries
Browse the full glossary for related definitions.
Educational only — not investment advice. See the disclaimer and methodology. Material methodology corrections are logged at corrections.