probability of hands holding up

[Poker21]

Can anyone tell me how to calculate the odds that a starting hand has to hold up until thec end?

[Copernicus]

there are too many possibilities to calculate by hand. You need Hold em Analyzer or a similar program.

[GeorgeF]

You could try my site (free):
http://www.iodo.us/cgi-bin/THEAssistant.pl

If it does not do what you want, email me and I will try to modify it.