For a 48-inch round table, a 70-inch-diameter tablecloth is generally the best fit. A 70-inch tablecloth provides a drop of about 11 inches all around the table, offering a decorative touch and protecting the table’s surface. If you prefer a longer drop for a more formal look, you can use a larger tablecloth, such as a 90-inch round tablecloth. At 90 inches, your tablecloth will almost reach the floor. Ultimately, what size tablecloth you choose depends on your personal preference, plus your desired visual aesthetic.