The nominal cumulative resistor tolerance is a function of resistor size, number of resistors on the board and the size of the board itself. Normally, an 8% to 15% tolerance is achievable for resistors which are multiple squares and a minimum of 20 mils wide. Most applications for termination or pull-up resistors can accommodate this tolerance range. For partial square resistors or designs using 100 ohm per square material with multiple resistor values and shapes on a layer, a 15-20% tolerance is what most board shops request.