[header] How to make blinds [title] Measure the window. [step] Use a tape measure to determine the width and length of the window you want covered. [title] Determine the length of the fabric and lining. 
[step] Add 2 inches (5 cm) of seam allowance to the length measurement. For a 72-inch (1.8-m) long window, the fabric and lining should each be 74 inches (1.88 m) long.