First, a brute-force attack does not use word lists. Read this article: https://www.infosecisland.com/blogvi...y-Attacks.html
For pure brute force attacks, all you need is the math about how many passwords you may be able to check in a certain time (check server restrictions here!) and the time it would then take to find a certain password of a certain length and contents. Use this: http://lastbit.com/pswcalc.asp


