Implied Volatility (20 Day)
Returns the 20-day implied volatility, which represents the market's expectation of price movement over the next 20 trading days (approximately 1 calendar month).
What is 20-Day IV?
20-day IV is calculated from options expiring in approximately 20 trading days. It's useful for:
- Monthly options trading
- Short to medium-term strategies
- Comparing to 30-day IV for term structure analysis
Return Value
Returns a decimal value representing annualized volatility:
- 0.20 = 20% annualized IV
- 0.50 = 50% annualized IV
Parameters
| Parameter | Type | Required | Description |
|---|---|---|---|
| Symbol | string | Yes | Stock ticker symbol |
| StartDate | date | No | Historical date (defaults to current) |
Examples
=ImpliedVolatility20d("AAPL")=ImpliedVolatility20d("TSLA")=ImpliedVolatility20d("SPY")=ImpliedVolatility20d("AAPL",DATE(2024,1,15))=ImpliedVolatility20d(A1)=ImpliedVolatility20d("AAPL")*100When to Use
- Monthly options trading
- Comparing IV term structure
- Near-month volatility analysis
- Short-term strategy planning
When NOT to Use
Common Issues & FAQ
Q: Why use 20-day instead of 30-day IV? A: 20-day IV is closer to actual monthly option expiration cycles (which are roughly 21 trading days). 30-day is the standard benchmark but 20-day may be more relevant for specific monthly trades.
Q: How do I convert to percentage?
A: Multiply by 100: =ImpliedVolatility20d("AAPL")*100
Q: How do I compare 20-day to 30-day IV?
A: Use: =ImpliedVolatility20d("AAPL")-ImpliedVolatility30d("AAPL") to see the term structure difference.
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