Implied Volatility Percentile (1 Month)
Returns the implied volatility percentile over a 1-month lookback period. IV Percentile shows what percentage of days had a lower IV than the current level.
Calculation
IV Percentile = (Days with IV < Current IV) / Total Days * 100IV Percentile vs IV Rank
| Metric | What it Measures |
|---|---|
| IV Percentile | % of days with lower IV |
| IV Rank | Position within IV range |
Interpretation
| IV Percentile | Meaning |
|---|---|
| 0-25% | IV lower than most recent days |
| 25-50% | Below average IV |
| 50-75% | Above average IV |
| 75-100% | IV higher than most recent days |
Parameters
| Parameter | Type | Required | Description |
|---|---|---|---|
| Symbol | string | Yes | Stock ticker symbol |
| StartDate | date | No | Historical date (defaults to current) |
Examples
=ImpliedVolatilityPct1m("AAPL")=ImpliedVolatilityPct1m("TSLA")=ImpliedVolatilityPct1m("SPY")=ImpliedVolatilityPct1m("AAPL",DATE(2024,1,15))Symbol from cell
When to Use
- Understanding IV relative to recent history
- Options strategy selection
- Screening for volatility opportunities
- Short-term volatility analysis
When NOT to Use
Common Issues & FAQ
Q: What's the difference between IV Percentile and IV Rank? A:
- IV Percentile (this): Percentage of days with lower IV
- IV Rank: Where IV is within its high-low range
Example: If IV is 30% and over the past month it ranged 20-50%:
- IV Rank = (30-20)/(50-20) = 33%
- IV Percentile = depends on distribution of daily IVs
Q: Why is 1-month percentile different from 1-year percentile? A: They use different lookback periods. 1-month is more reactive to recent changes, 1-year gives broader perspective.
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