IV laboratory
Expected Move / HV / IV Rank / IV Percentile
Manual data input. Default price and IV are teaching assumptions, not market quotes. Historical metrics remain blank without samples.
Expected Move = S × IV × √(days/365), not a move limit. HV uses sample standard deviation of log returns × √252. Rank uses the sample range (undefined for a flat history); Percentile counts observations strictly below current IV. Sample tenor and length affect results; verify your data.
IV
Annualized volatility inferred from an option price under a chosen model. It is not a promise of realized volatility or a directional forecast.
HV
Dispersion of past returns. The lab annualizes sample standard deviation of daily log returns by sqrt(252); use consecutive adjusted daily closes.
IV Rank
Here: (current IV−sample minimum)/(sample maximum−sample minimum)×100. Undefined for a flat history; it can be outside 0–100 when current IV is outside the supplied sample.
IV Percentile
Here: the percentage of historical observations strictly below current IV. Use comparable tenor and measurement conventions; tie handling changes results.
Volatility Smile
IV varies across strikes for one expiry. Both wings may sit above at-the-money IV, producing a smile; actual shapes vary by market and date.
Skew
Asymmetry across a same-tenor volatility curve, such as higher IV for lower-strike puts. Compare consistent tenor and Delta or moneyness.
Term Structure
The relationship between IV across expiries at comparable moneyness. Events can lift near-term IV above longer tenors; the curve is not a guaranteed forecast.
Expected Move
The lab uses S×IV×sqrt(calendar days/365) as a one-standard-deviation dollar approximation. It is not a maximum move or a guaranteed probability interval.