For the spread traders: is there any easy method or even a website for quickly estimating expectancy of a vertical? I can do it in Excel but I have to input all the information explicitly (max loss, max gain, probabilities of expiring above/below the strikes, etc.). It's a giant pain, but it's a must when I'm trying to assess the highest expectancy trade among a group of candidate spreads.
There is not publicly available !accurate! method for quick expectancy calculation of vertical spread

I have developed such software... for painfully a lot of money I am willing to lease it

Though I am able to provide only results (win%, fair price, edge calculations, ... ), math behind it is proprietary secret.
There is also possibily to run scans for all possible combinations of vertical spreads and finding those which have bid/ask not in match with probabilites of win% (actually most of verticals are mispriced). Those scans can be done thru basket of optionable markets and can be sorted and filtered based on vertical widths, times to expiration, edge, win%, credit call/debit put vs debit call/credit put, etc.
This way we are able to find best of the best vertical spreads.
We were doing precision comparision for different methods and our method proved to superior to other methods like using greeks, standard deviations and stuff like that...
Anyway I do not expect potential customer for lease of software in this area ever, because we want to be pretty damn expensive with this solution

You know, it is better to use it for our own trading...