Not one is exact. They are all pure guesses. Occasionally they get some right, but if you were to guess a million websites' future PR, you'd probably get some right, too.
It is pretty accurate for every website I have tested. The real question is when google will update all the links.
hmm interesting post , hey guys can you please share tools here to , please post there links , i would like to check my blogs pr also .
Try with www.link.ezer.com/tools/pagerank_prediction.asp www.iwebtool.com/pagerank_prediction www.seomoz.org/page-strength above mentioned thrice of these tools are little bit good. i have searched more than 20 to 25 tools. but i like these three tools. Well mate. it's just for fun for newbies. Still it will give u some idea where you are doing good and where you are failing. Regards, Jjshoponline.net
I have tried one of the links above and it predicts that my website radiobounce will get a page rank of 2 soon enough...but when?..
Nopes! pagerank prediction tools are not accurate as it is only the Google who knows the exact algorithm for PR.
All these tools who says they can predict Google page rank are crap, I tried many of them with websites who get millions users per day... Check my post on these tools here http://feedshub.blogspot.com/2008/05/google-pagerank-prediction-tool-who.html