For grommet curtains you will need to take into account the placement of the grommet.
Height to hang curtain rod.
To find the right curtain length measure from the floor to where you ll hang the rod usually 4 to 6 inches above the window frame.
This is a traditional height though you can cheat an inch or so either way depending on the height of your ceiling and the length of your finished curtains.
Don t scrimp on length.
Make a mark about four inches above your window for mounting hardware.
Use these same rules when the windows are arched.
This is particularly important to do if the room has low ceilings.
To create the illusion of height mount the drapery rods close to the ceiling.
Interior designers note the bottom of your curtains should fall to the floor and you can even let them puddle a bit.
When you hang the curtain rod high it will make the window appear taller.
For the ideal middle ground curtains should hover just above the floor.
No matter what the ceiling height the minimum distance from the top of the window casing to the curtain rod is two inches.
Curtains come in common lengths like 63 84 and 96 inches.
Hanging the curtain panels with the rod and panel s dimensions figured out it s time to begin the process of hanging your new curtains.