Please refer to the following calculation when placing an order: for example, the wall height is 2.5 meters, the width is 3 meters. Please add me an extra 0.05m for height and width when you calculate. Area: (2.5 + 0.05) m * (3 + 0.05) m = 7.77 square meters. You need to purchase 8 square meters when you place an order.