Make sure that you’re getting the right curtain size for your window before you place the order. If you buy a curtain that is too narrow/short, it will appear to be a mistake.  The right size curtain can really transform a space.

Don’t know how to calculate curtain size? It is easy, simply follow these steps with Senjoo!

Before You Begin

Please place the curtain rod/track at a proper height. We suggest that the rod/track sit at least 6-8 inches above your window, if your curtain rod is too low, it’ll shrink your window size and this is definitely something you want to avoid. It should also be 6-15 inches wider than your window on each side, to block light and allow space for the curtains to open.

Step 1: Curtain Width

The rule of thumb is that your curtains should be 2 to 3 times as wide as your window to achieve a look of proper fullness.

Width of per curtain panel= Rod or Track width / Number of panel x Fullness.

Standard fullness multiply by 2

Deluxe Fullness multiply 2.5

Ultra fullness multiply by 3

Width of per panel = Rod or Track width / Number of panel.

Unlike other headings, Pinch Pleat Curtain requires more fabric. Double pinch pleat is constructed with 2 times the fabric of the panel width and triple pinch pleat is 2.5 times. No extra fullness needed, the curtain width should be the same as the coverage width.

*Know more about Curtain Headings please refer to this article.

Step 2: Curtain Length


Curtain lengths vary depending on the style you want. Here are some length options to consider and when you should use them.

  • Sill Length: These curtains end right at the window sill. This is appropriate in places like a kitchen where the window is elevated.
  • Below Sill: Recommend to end 4-6 inches after the sill. They look grate in casual spaces like a breakfast nook or if you have a radiator under the window, or you want to keep fabric out of the way of pets.
  • Floor Length: Recommend to end 1cm above the floor. The curtains barely touch the floor and doesn’t rise above it. (High-water curtains, just like pants, are a definite no-no). This is a classic and popular option, especially for living rooms. And they’re one of the easiest to maintain and to open and close.
  • Puddle: The curtains are slightly longer, usually extend about 1-8 inches onto the floor. The result is a bit more of a romantic and luxurious look. It’s a good choice for traditional and formal places such as dining rooms. Please note this style requires a little more maintenance since the curtains will easily collect dirt, dust and animal dander. They are also harder to open and close, so avoid using them in high-traffic areas.

Generally, when you measure the length, start from the top of the curtain rod/tract to where you want the curtain to finish. (For grommet curtains, add extra 0.8 inches to the length, this is the length of the grommets).

Pro Tips

  • If you can’t find standard size curtains that fit your home, why not take advantage of our speedy made-to-measure service and have the curtains customized to fit perfectly? If you have any specific changes in mind, simply contact us here or email us at and we’ll be more than happy to assist you.
  • Make sure your curtains are long enough. Short curtains make a room look smaller and incomplete. When in doubt, go with longer curtains rather than a shorter, cut off length.
  • Don’t skimp on fabric. One 52 inches wide panel won’t look good on a 52 inches window, you may need multiple panels for enough fullness. Generally your curtains should be 2 to 3 times as wide as your window to achieve a look of proper fullness.
  • If you need any further help, please drop us an email at, we will help you make things right.

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