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Explain ‘Delta’ in Simple Terms for an Option Contract.

Delta is the most important of the Greeks, representing the change in the option's price for a one-unit change in the underlying asset's price. A Delta of 0.50 means the option price will move 50 cents for every $1 move in the underlying stock.

It also represents the approximate probability that the option will expire In-The-Money.

Why Is Delta Typically Lower for Out-of-the-Money (OTM) Options?
What Is the Delta of an Option and How Is It Interpreted?
What Is the ‘Delta’ of an Options Contract?
How Does the Risk-Neutral Probability Concept Relate to Delta?