[header] How to make sheer curtains [title] Use measuring tape to measure window height from the point where the curtain rod will be to the bottom of the window. [title] Decide how much longer you want your curtains to be than the window. [title] Measure length of the curtain rod. 
[title] Measure circumference of the curtain rod and add 1 inch (2.5 cm) to allow for a seam. [substeps] How full your curtains are is a matter of taste.