There are a lot of formulas, but here is an easy one that works. Take an 8.5 x 11 Brochure with 2 folds. FRONT: Divide the front into 3 equal panels. The first panel on the right is #1, and that is where you will put your logo, name, front picture or whatever you want on the front. It is 3.66" wide x 8.5 tall. The middle panel, #2 is also 3.66", and is where you will put your back panel information. The third panel on the far left is 3.56" wide and will be folded inside. BACK: Now for the back page, the order is opposite. Back # 1 on the far left is 3.66", the middle #2 panel is 3.66", and the far right panel is 3.56" wide x 8.5 tall.