You can guesstimate what options will achieve by looking at existing option chains - albeit limited to price movement equivalent to strike difference and expiration series difference.
For example, a $30 stk. If price dropped $2.50 today, the $30 put would go to the value of the current $27.50 put (ignoring IV change).
For time related guesstimates, the if it took 1 month for it to drop $2.50, the May 30 put would be worth what the Apr 27.50 put is worth today. Obviously, this assumes IV is static... or at least shifts to what the next month is. IRL, it's a bit more complicated
Clear as mud?
For example, a $30 stk. If price dropped $2.50 today, the $30 put would go to the value of the current $27.50 put (ignoring IV change).
For time related guesstimates, the if it took 1 month for it to drop $2.50, the May 30 put would be worth what the Apr 27.50 put is worth today. Obviously, this assumes IV is static... or at least shifts to what the next month is. IRL, it's a bit more complicated

Clear as mud?