How to calculate what I need ?
​ -​ Generally the rule of thumb is to utilize a support bracket every 48" with a bracket within 6" from each end and/or a​ corner. Remember to add the projection of the bracket less the dimension of the corner fitting when creating "L" shaped configurations otherwise you will​ leave your railing system short from the ends when ordering.
​ EXAMPLE : If your bar is 60" x 96" , you will need 5 brackets , 2 caps, and a 90 corner with tube lengths of 64.5" x 100.5"   This will take you right to the end of the ends of your bar. You will need to adjust for your end cap accordingly. They add 1/8" to 1" depending on style.