What are the standard dimensions of a mid-page unit or rectangle ad? By vmartinez What are the standard dimensions of a mid-page unit or rectangle ad? 90 x 728 250 x 300 300 x 250 728 x 90 Related content Related questions:Where is the Medium rectangle/square advertising…The Medium Rectangle display unit keeps viewers…What is the standard lead time for the medium…What are the standard dimensions of a leaderboard ad?