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Delta
Delta measures how much an option's theoretical value is expected to change for a $1 change in the underlying asset price, assuming other relevant factors remain unchanged. Calls generally have positive Delta. Puts generally have negative Delta. Example A call has: Delta = 0.60 If the underlying rises by approximately $1, the option's theoretical value might initially be expected to increase by roughly: $0.60 all else equal. With a standard 100 share contract multiplier, that corresponds to approximately: $60 per contract.
Why it matters to you
Delta helps traders understand the directional exposure of an option. But Delta is not fixed. As the underlying moves, Delta can change. That brings us to Gamma.