When closed the table measures 22.25 inches in width, 17.75 in depth and 30.5 inches in height (56.5 cm x 45 cm x 77 cm). When open the width is 44.5 inches (113 cm). The widest opening on the drop down portion is 12.75" (32.5 cm) X 9.25" (23.5 cm). The notch in the corner is approximately 2 inches making the narrow portion of the opening 10.5" and 7.25" (see photo). Drop down will fit a serger, but a sewing machine could be stored underneath in the cabinet.