Please measure the size and height of the curtain railing/wooden rod before buying the curtain fabric, so that you can easily calculate how many metersyou want to buy. If you are not sure about the size, you can refer to the following normal size meters : Normal Sliding door height 9ft Normal Window height 7ft For Railing / Wooden Rod Sliding door 2 panel = 10m / 13m Sliding door 3 panel = 13m / 16.5 Sliding door 4 panel = 16.5m / 20m Window 1 panel = 2.75m / 5.5m Window 2 panel = 5.5m / 8.5m Window 3 panel = 8.5m / 11m Window 4 panel = 11m / 14m