How we can calculate future Page Rank *(-_-)*

[anuj]

Hi Friend,
I hope all you are doing well.
I want to know that how we can calculate our future page rank.

I want to know future rank of http://www.brickred.com

We had 7 PR but before some days it gone to 6.

So i want to know that what will be the future PR of Brickred Technology.