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What Is the Delta of an ATM Option Approximately?

Approximately 0.50 (or -0.50 for a put), reflecting a near 50% chance of expiring in-the-money.
Greeks.Live22.11.25

What Is the Delta of an ATM Option Approximately?

The delta of an at-the-money (ATM) option is approximately 0.50. Delta represents the probability that the option will expire in-the-money.

Since the ATM option is equally likely to move ITM or OTM, its probability of expiring ITM is close to 50%, or 0.50. Call options have a positive delta, and put options have a negative delta.

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