I don't trust any of the prediction tools. Why should wwe trust those junks when google clearly says their PR calculations are a top secret? Forget it.
All PR prediction tools are crap and the one at iwebtool is the worst to predict. At some point of time, it will predict your PR as PR 8 (It may be a fairly new site) and an old site with a good number of backlinks will be returned with the result "insufficient number of backlinks"
Your page rank will be what it will be - you have no control over how google ranks it and page rank predictors have no way of tapping the google algo's to make an accurate prediction. Predictors are for entertainment only and are usually off by a good margin.
I definitely agree with Jim here, pagerank predictions tools amongst many other tools such as website appraisal tools should be used just for a laugh, and not to be taken seriously.
Those tools are done just for fun . . .Do not trust all of those!I tried it and result are great, but I just laugh at it!
don't expect much using that tool, it will never give you efficient results, I tried it before but my sites PR stills the same.
the prediction tools are like asking a blind man how many fingers you have holding up....they just guess. Take it as a fun thing, not as something worth believing.
Pr prediction tools and website value calculators should be used for entertainment/motivation purposes only.