July 27, 2020

Option Delta and Theta

Option Delta measures the degree to which an option is exposed to shifts in the price of the underlying asset (i.e., a stock) or commodity (i.e., a futures contract). Values range from 1.0 to –1.0 (or 100 to –100, depending on the convention employed).

Option Theta refers to the rate of decline in the value of an option over time. If all other variables are constant, an option will lose value as time draws closer to its maturity.  Theta, usually expressed as a negative number, indicates how much the option’s value will decline every day up to maturity.

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about the author:

Mike Shorr

Since 1994, Michael has been an on-the-floor market maker, Vice-President of Interest Rate Derivatives for Knight Financial Products and Director of Education and Options Instructor at Trading Advantage. He makes the oftentimes complex world of options and trading accessible to the novice and advanced trader alike. Michael has a Bachelor of Science degree in Statistics and Finance from the University of Illinois Champaign-Urbana. He presently is Director, Trader Education at ProsperTradingAcademy.

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