MarketXLS

Implied Volatility (30 Day)

Returns the 30-day implied volatility, which is the standard benchmark for measuring options market volatility. This is the most commonly referenced IV measurement in options trading.

Why 30-Day IV?

30-day IV is the industry standard because:

  • Aligns with typical monthly option cycles
  • The VIX index uses 30-day IV calculation
  • Provides a consistent benchmark across stocks

Return Value

Returns a decimal value representing annualized volatility:

  • 0.15 = 15% annualized IV (low volatility, like SPY)
  • 0.30 = 30% annualized IV (moderate volatility)
  • 0.60 = 60% annualized IV (high volatility, like meme stocks)

Expected Move Calculation

To estimate the expected one standard deviation move over 30 days:

Expected Move = Stock Price * IV * SQRT(30/365)

Parameters

Parameter Type Required Description
Symbol string Yes Stock ticker symbol
StartDate date No Historical date (defaults to current)

Typical IV Ranges

Stock Type Typical IV Range
Large-cap stable (JNJ, PG) 15-25%
Tech (AAPL, MSFT) 20-35%
Growth (TSLA, NVDA) 40-70%
Meme stocks 60-150%+

Syntax

=ImpliedVolatility30d(Symbol, [StartDate])
Excel Desktop (Windows)

Parameters

symbolstringRequired

Stock ticker symbol

startDatedate

Historical date to retrieve IV for (optional, defaults to current)

Returns

number

30-day implied volatility as a decimal (e.g., 0.25 for 25%)

Examples

=ImpliedVolatility30d("AAPL")
Apple 30-day IV (most common)
=ImpliedVolatility30d("TSLA")
Tesla 30-day IV
=ImpliedVolatility30d("SPY")
SPY 30-day IV (compare to VIX)
=ImpliedVolatility30d("AAPL",DATE(2024,1,15))
Historical 30-day IV
=ImpliedVolatility30d(A1)
Symbol from cell
=ImpliedVolatility30d("AAPL")*100
Convert to percentage (23%)

When to Use

  • Standard IV reference for any stock
  • Comparing volatility across stocks
  • Options pricing and strategy selection
  • VIX-like analysis for individual stocks

When NOT to Use

Scenario Use Instead
Need IV ranking ImpliedVolatilityRank1y()
Weekly options ImpliedVolatility10d()
Long-term LEAPS ImpliedVolatility1y()
Need to compare to historical ImpliedVolatilityPct1y()

Common Issues & FAQ

How does this compare to VIX?

VIX measures 30-day IV for S&P 500 options. ImpliedVolatility30d("SPY") should be similar to VIX.

How do I convert to percentage?

Multiply by 100: =ImpliedVolatility30d("AAPL")*100 returns 23 for 23%.

How do I calculate expected move?

For a 30-day expected move (1 standard deviation): =Last("AAPL")*ImpliedVolatility30d("AAPL")*SQRT(30/365)

What's considered high IV?

It depends on the stock. Use ImpliedVolatilityRank1y() to see if current IV is high relative to its own history.

Related Formulas

More MarketXLS Options formulas you can use in the same worksheet:

See ImpliedVolatility30d used in a complete workbook: Options Data in ChatGPT: Build an AI Options Analysis Workflow in Excel

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