http://www.softdivision.com/info.php?info=114 Keep in mind that there are also other factors that affect your pagerank e.g low quality backlinks.
It's not a matter if backlinks only. I would say as long as you combine 1) Quality Backlinks 2) Original Content 3) Hot Niche You will be just fine!
the quality is more important than quantity, 1 PR9 backlink can bring you to at least PR2, and thousand PR0 backlink are not enough for you to get PR2
Increasing pagerank from one number to the next is based on a logarithmic formula, so there is not a consistent number you need to gain to move from one pr position to the next. The number of backlinks required to move from one pagerank to the next increases the higher you go.
PR doesn't depends upon how many backlinks you have, it only depends only on the quality backlinks of your site.
This man is right . No one can tell you exactly . Every one will suggest you to create content and posy unique content to your site
Found this, it is not exact since no one but Google knows the real values [TABLE="class: bftbl, width: 100%"] [TR] [TD="class: lnkHdr, align: center"]PR[/TD] [TD="class: lnkHdr, align: center"]Links For PR3[/TD] [TD="class: lnkHdr, align: center"]Links For PR4[/TD] [TD="class: lnkHdr, align: center"]Links For PR5[/TD] [TD="class: lnkHdr, align: center"]Links For PR6[/TD] [TD="class: lnkHdr, align: center"]Links For PR7[/TD] [TD="class: lnkHdr, align: center"]Links For PR8[/TD] [/TR] [TR] [TD="align: right"]1[/TD] [TD="align: right"]555[/TD] [TD="align: right"]3,000[/TD] [TD="align: right"]17,000[/TD] [TD="align: right"]93,000[/TD] [TD="align: right"]508,000[/TD] [TD="align: right"]2,800,000[/TD] [/TR] [TR] [TD="align: right"]2[/TD] [TD="align: right"]101[/TD] [TD="align: right"]555[/TD] [TD="align: right"]3,000[/TD] [TD="align: right"]17,000[/TD] [TD="align: right"]93,000[/TD] [TD="align: right"]508,000[/TD] [/TR] [TR] [TD="align: right"]3[/TD] [TD="align: right"]19[/TD] [TD="align: right"]101[/TD] [TD="align: right"]555[/TD] [TD="align: right"]3,000[/TD] [TD="align: right"]17,000[/TD] [TD="align: right"]93,000[/TD] [/TR] [TR] [TD="align: right"]4[/TD] [TD="align: right"]4[/TD] [TD="align: right"]19[/TD] [TD="align: right"]101[/TD] [TD="align: right"]555[/TD] [TD="align: right"]3,000[/TD] [TD="align: right"]17,000[/TD] [/TR] [TR] [TD="align: right"]5[/TD] [TD="align: right"]1[/TD] [TD="align: right"]4[/TD] [TD="align: right"]19[/TD] [TD="align: right"]101[/TD] [TD="align: right"]555[/TD] [TD="align: right"]3,000[/TD] [/TR] [TR] [TD="align: right"]6[/TD] [TD="align: right"]1[/TD] [TD="align: right"]1[/TD] [TD="align: right"]4[/TD] [TD="align: right"]19[/TD] [TD="align: right"]101[/TD] [TD="align: right"]555[/TD] [/TR] [TR] [TD="align: right"]7[/TD] [TD="align: right"]1[/TD] [TD="align: right"]1[/TD] [TD="align: right"]1[/TD] [TD="align: right"]4[/TD] [TD="align: right"]19[/TD] [TD="align: right"]101[/TD] [/TR] [TR] [TD="align: right"]8[/TD] [TD="align: right"]1[/TD] [TD="align: right"]1[/TD] [TD="align: right"]1[/TD] [TD="align: right"]1[/TD] [TD="align: right"]4[/TD] [TD="align: right"]19[/TD] [/TR] [TR] [TD="align: right"]9[/TD] [TD="align: right"]1[/TD] [TD="align: right"]1[/TD] [TD="align: right"]1[/TD] [TD="align: right"]1[/TD] [TD="align: right"]1[/TD] [TD="align: right"]4[/TD] [/TR] [TR] [TD="align: right"]10[/TD] [TD="align: right"]1[/TD] [TD="align: right"]1[/TD] [TD="align: right"]1[/TD] [TD="align: right"]1[/TD] [TD="align: right"]1[/TD] [TD="align: right"]1[/TD] [/TR] [/TABLE]
Getting PR for the site doesnt contain BACKLINK alone FOR PR calculation there are many factory taken into account