153 Implied volatilities The implied volatility calculated from a European call option should be the same as that calculated from a European put option when both have the same strike price and maturity The same is approximately true of American options Options, Futures, and other Derivatives, 5th edition 2002 by John C. HullOptions, Futures, and Other Derivatives, 5th edition © 2002 by John C. Hull 15.3 Implied Volatilities • The implied volatility calculated from a European call option should be the same as that calculated from a European put option when both have the same strike price and maturity • The same is approximately true of American options