For most buyers, measuring is about where the curtain starts, how full it feels, and where the bottom lands. Start with the window, then add coverage and stack-back space for the room.
Start here
- Header style guide to match the top construction.
- Lining guide to decide privacy and light control first.
- Free swatches before you lock the final order.
What to measure first
- Window width
- Window height
- Space for rod or track placement
- Stack-back space on each side
- Final bottom position
How to think about width
Width is not just about covering the window. It also decides how full the curtain looks when closed.
How much curtain width do I need for a 108-inch window?
Start with the full width of the rod or track, not only the glass. Then multiply that width by the fullness you want. For a 108-inch rod or track, the total fabric width is approximately 162 inches at 1.5x fullness, 216 inches at 2x fullness, or 270 inches at 2.5x fullness.
- 1.5x fullness: a cleaner, lighter look for structured headers or simpler rooms.
- 2x fullness: a balanced starting point for most custom curtain installations.
- 2.5x fullness: a softer, fuller look when the fabric is light or the room calls for more drape.
These figures describe the total fabric width before it is divided into panels. The final choice can change with the fabric weight, header style, stack-back space, and whether the curtains need to close fully every day.
For a faster estimate, use the Curtain Measurement Finder, then compare fabric and color with Free Swatches before you order.
How should I choose one panel, a pair, or more fullness?
Use the rod or track width as the starting point, then decide how the curtains will open. A pair usually gives a more balanced split for wider windows, while a single panel can work when the stack-back is designed to one side. Check the product details to confirm whether a listing is sold as one panel or a pair.
How to think about length
- Slightly above the floor: practical and easy to maintain
- Kissing the floor: clean and balanced
- Puddling: softer and more decorative
How header style changes measuring
Pinch pleat and euro pleat usually need more attention to the top structure. Grommet and tab top are simpler, but the rod placement still matters.
Common mistakes
- Measuring only the glass and ignoring frame or rod space
- Forgetting stack-back on each side
- Choosing length before deciding the bottom look
- Not matching the measuring method to the header style
Room-by-room starting point
Living room: measure for a fuller look if you want the window to feel dressed. Bedroom: keep privacy and light control in view. Dining room: stay balanced so the curtain feels polished without looking heavy.
Related guides: Curtain Header Style Guide, Curtain Lining Guide, Free Swatches, Blackout Curtains.
FAQ
Do I measure curtain width or window width first?
Start with the window width, then decide how full you want the final curtain to look.
Should curtains touch the floor?
Many buyers prefer a light touch or a slight break, but it depends on the room and the look you want.
Do all header styles measure the same way?
No. The header style changes how the curtain hangs and how the top should be planned.
Can I measure before choosing lining?
You can, but it is better to think about lining at the same time.
What should I check before ordering?
Check width, height, header style, lining, and how much coverage you want on each side.
