This question already has an answer here:

Underlying = 100 K = 90

1 year Put at K is trading 5. What's the approximate delta of the put?


marked as duplicate by LocalVolatility, Bob Jansen Apr 22 '17 at 15:36

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assuming you don't have a black scholes pricer, or don't want to rely on a pricer... the following book contains many of the "rule of thumbs" that you are seeking:


  • $\begingroup$ That would be a good addition to the linked question. $\endgroup$ – Bob Jansen Apr 22 '17 at 15:35

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