Thanks for your question! All 3 shelves are adjustable, each section has 3 settings. The total height of each section, minus the space the shelf takes up, is 18 1/4" high so with the shelf in place, the top and bottom sections would be about 9". The middle cabinet is 20" wide and the two side cabinets are 16". Each of the 3 is about 13 1/4" deep. Please let us know if you have any other questions!