Implied Volatility Calculator
Back out implied volatility from options market prices using Black-Scholes model.
Frequently Asked Questions
What is Implied Volatility?
IV is the market's expectation of future volatility, derived from the option's current market price. Higher IV means more expensive options.
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What is this tool?
Implied volatility (IV) is the market's expectation of future price fluctuation, derived by reverse-engineering the Black-Scholes model from an option's current market price. Unlike historical volatility which looks backward, IV is forward-looking and is the single most important factor in option pricing. Higher IV means more expensive options for both buyers and sellers.
How to use
- 1
Enter market price
Type the current market price of the option.
- 2
Set underlying price
Enter the current price of the underlying stock or asset.
- 3
Configure option details
Set the strike price, days to expiry, and risk-free rate.
- 4
Choose option type
Select whether this is a call or put option.
- 5
View IV results
See the implied volatility percentage, interpretation, and comparison table across different IV levels.
Frequently Asked Questions
What is implied volatility?
Implied volatility is the market's forecast of an underlying's future volatility, extracted from the option's current price. It represents the annualized standard deviation of expected returns. High IV signals expected large price movements; low IV signals expected calm.
Why does IV matter for options trading?
IV directly determines option premiums. When you buy options, you want IV to rise (expansion), as this increases the time value of your position. When selling options, you want high IV to sell at inflated premiums. IV crush after earnings is a common trap for option buyers.
How is IV different from historical volatility?
Historical volatility measures actual past price movements using closing prices over a specified window (typically 20-30 days). IV is forward-looking and reflects market expectations embedded in option prices. IV can diverge significantly from HV, creating trading opportunities when the gap narrows.