I found this tool a while ago, It predicts pagerank for your domains simply write down the adress for all your domains and it will make a prediction for you.
The results are not guaranted ofcourse but I learned that taking the number you get -1 you can be pretty sure that it is at least what pr you should get.
Check it out here: Pagerank Prediction
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Google PageRank carefully explained and what you can do with it – written by top SEO experts.
http://www.pagerank-prediction.com/
Thank you…