It depends on the quality of your backlinks and how long those links have been indexed by google. If the quality of your links is good your page rank will go up in due time.
please refer to thread "http://forums.digitalpoint.com/showthread.php?t=758804" as there thanks to another user i was informed that tools show as page rank forged.... cool! im a hacker! now how can i forge all my other websites, cause i sure wouldnt mind owning a couple of pr10's
if your site is new... then wait for the next google page rank update... otherwise if you are involved in paid links then google might have penalized your site and as a result your site is PR0... --Thanks...