Does anyone know a website that can calculate the value of a backlink?

Does anyone know a website that can calculate the value of a backlink?

The value of a backlink is basically the PR of the page the link is on divided by the number of other outbound links on it. Is there a website or calculator that does this automatically. Currently I would have to determine the PR through googles pr checker of the page and count the number of other OBLs (through backlinkwatch) and calculate it myself. I need a website to do that for me automatically. Anyone?