Implied Volatility
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Annualized IV
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IV Level
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When Should You Use This?
Use this to determine if options are cheap or expensive. High IV means options are pricey (good for selling), low IV means they're cheap (good for buying). IV typically spikes before earnings and during market fear.
How It Works
1
Enter Option Details
Input the current stock price, strike price, option market price, and days until expiration.
2
Set Risk-Free Rate
Enter the current Treasury bill yield (approximately 4-5% in 2026).
3
Interpret IV
Normal IV for large-cap stocks is 15-25%. Above 30% is elevated. Above 50% is very high (often before earnings or during crisis).
Frequently Asked Questions
IV is the market's expectation of future price movement, backed out of option prices. High IV = market expects big moves. Low IV = market expects calm.
Historical volatility (HV) measures past price movement. IV measures expected future movement implied by option prices. When IV > HV, options are relatively expensive.
IV is the single most important factor in option pricing after the stock price itself. Buying options when IV is high means you're overpaying; selling when IV is high means you're collecting extra premium.
The VIX is the implied volatility of S&P 500 options, often called the 'fear index.' VIX below 15 = calm market, 15-25 = normal, above 25 = elevated fear.
This calculator uses call option pricing. For European-style options, put-call parity means put IV equals call IV at the same strike. For American options, there may be slight differences.