Not sure about more precise, but it does give some rather good advises, (for example it thinks I have too many images on my home page, and that might be true). FFMG
Pretty cool website. My site was ranked above 93% of all the other websites, but I'm sure I could get it up to 98% with some minor changes. They also said I would get a pagerank of 4, hope to increase that to 5-6 by the end of this year.
As you are in the process of testing the tool so I gave it a try and it did below average for my website. It estimated that my website (SIG 1) that has 600 back links can have a page rank of 1 in 3 to 12 months time whereas it already is a page rank 3 website, but again you made it clear that PR estimation depends on the quality of your back links. A humble piece of advice, while collecting data for age, either take it in years or months because that will make it easier for user to understand what to enter. Secondly, have a criteria for estimation i.e if one is listed in directories like Yahoo, DMOZ or not. Wish you all the best
Like I said, this tool is early development and only measures a website by it's backlink, outbound links and age of domain. In the future I'm hoping to implement new measurements of metrics.
I try some other tools as well links seonlinelab[.] but the result of every tool is different, this is because everyone see goolge algo in it own way, but nobody have the exact algo.
A database of averages based on inbound/outbound links really can't be used to estimate pagerank. The visible PR you see is a value from 1-10 that represents where a pages actual pagerank falls on a logarithmic graph. http://en.wikipedia.org/wiki/PageRank