Top shelf: 29.5 inch wide x 19.5 inch deep Bottom shelf: 22.5 inch wide x 11.75 inch deep Keyboard Shelf: 22.5 inch wide x 13 inch deep Middle shelf: 23.5 inch wide x 15.25 inch deep 29.5 inch wide x 20 inch deep x 34.5 to 45.5 inch high (in 1 inch increments)