Window width multiplied by height: this is the most commonly used calculation method of curtain size. For example, if the width of the window is 1.5m and the height is 2.2m, then the size of the curtain should be1.5mx2.2..
Window width times 2 plus 1 ft: This method is suitable for windows with large width and small height. For example, if the width of the window is 2m and the height is 1.5m, then the size of the curtain should be 2m x 2.5.
Window height times 2 plus 1 ft: This method is suitable for windows with large height and small width. For example, if the height of the window is 2.2m and the width is 1.5m, then the size of the curtain should be 2.2m x 2.5.
According to the length of the window, this method is suitable for windows with larger length. For example, if the window is 3 meters long, then the curtain should be 3 meters long.
It should be noted that the above calculation methods are just some common curtain size calculation methods, and the specific curtain size needs to be calculated and adjusted according to the actual situation. In addition, if you are not sure how to calculate the curtain size, you can consult a professional curtain designer or merchant.