Hello,
This canvas in inches is 13.6 x 22.6 and there are 7 holes per inch because it's a 7 mesh canvas. That means there are 95 holes across and 154 down (I just multiplied 7 by the 13.6 and 22.6). If your design is needing the sheet to be 90 x 90, then you would count the squares on the sheet and make a mark where 90 is and then cut out your piece. Hope this helps.
~Kristi @ EPC