Amanda Knox being Guilty: 90%

Raffaele Sollecito being Guilty 90%

Rudy Guede being guilty: 90%

I hope you agree with me because no one else in the comments seem too. I'm gonna give the probability of you agreeing with me 75% based on my own arrogance and belief that I'm right and based and little else really.

Most people seem to believe Rudy Guede is guilty so lets skip that and look at the other two. They've changed their stories and have been proven to have lied quite a few times. For example Rudy at one point said he was at home surfing the internet but his alibi is not substantiated by records of his internet service provider.
Amanda at one point said she was round Rudy's house till 10am (later changing her story) but according to a witness she was at the store as soon as it opened to buy cleaning products.

That alone is some strong evidence that they are both guilty.

If they were innocent there would be no need to lie.

Probably the most damning piece of evidence is this:

When Sollecito's home was searched, a knife was found in a kitchen drawer that contained small traces of Kercher's DNA on the blade, and Knox's on the handle.

There really is no other explanation for that. Unless she was round Sollecito's home at some earlier date and cut herself on his knife.

Here's another nail in the coffin:

Sollecito's footprint was found in blood in Kercher's room.
Don't forget this was behind a locked door!

Add all that evidence to the cleaning up afterwards, the body being covered, the rape fantasies Knox had, Sollecito's DNA on her bra etc. etc. All three of them clearly killed her. The jury clearly believed so as well which strengthens my argument. They spent months examining the case, so the idea that a few minutes of internet research makes you certain they're wrong seems laughable.