Custom window treatments work best when the size is chosen with a clear measuring method. Guessing can lead to panels that feel too narrow, roman shades that do not cover enough light, or curtains that hang at the wrong length. The safest process is simple: decide the product type first, choose the mount or rod position, measure more than once, then customize from those numbers.
Fredesigner has two important starting points: the Drapery Measuring Guide for curtains and the Roman Shade Measuring Guide for shades. Use this article as a plain-English overview before you open the detailed measuring page.
First decide: curtains or roman shades
Curtains and roman shades are measured differently because they work differently. Curtains hang from a rod or track and usually cover a wider area than the window itself. They need enough width for fullness, enough side coverage for privacy and light control, and the right finished length for the room.
Roman shades sit inside or outside the window frame. They lift upward, stay compact, and depend on precise width and height. A roman shade that is too narrow can leave side gaps. A shade that is too tall or too short can look unfinished or interfere with the window.
If you are still choosing the product type, compare Linen Curtains and Custom Roman Shades before measuring. The right measurements start with the right window treatment.
Measuring for custom curtains
For curtains, start with the rod or track width. If the rod is already installed, measure the usable rod length, not including decorative finials. If the rod is not installed, decide how far beyond the window frame it should extend on each side. Extra width gives the curtain room to stack away from the glass and can make the window look larger.
Next, decide the mounting height. A higher rod can make the room feel taller and help the curtain fall more cleanly. Measure from the top of the rod or the bottom of the rings to the point where you want the curtain to end.
Common length choices include:
- A slight float above the floor for easy cleaning.
- A clean touch at the floor for a tailored look.
- A small puddle for a softer decorative look.
- Sill or apron length only when the room or window requires it.
Then consider fullness. Curtains usually need more fabric width than the exact window width. Fullness is what keeps panels from looking flat or skimpy when closed. The right fullness depends on fabric, header style, window size, and the finished look you want.
Use the Drapery Measuring Guide before entering final dimensions. It helps you think through rod width, height, panel width, and finished length instead of relying on a single window measurement.
Measuring for roman shades
For roman shades, the first decision is inside mount or outside mount. Inside mount places the shade within the window opening. It looks clean and built in, but the window frame needs enough depth. Outside mount places the shade above or around the window frame. It can cover more area, reduce edge gaps, and make the window look larger.
Measure roman shade width in three places: top, middle, and bottom. Measure height in three places as well. Window frames are often slightly uneven, especially in older homes, so one measurement is not enough.
Choose inside mount when:
Choose outside mount when:
Before ordering, review the Roman Shade Measuring Guide. Roman shades reward careful measuring because small width changes can affect the final fit.
Do large windows need a different measuring plan?
Yes. Sliding doors, wide picture windows, tall windows, and open living spaces often need a different plan than a standard bedroom window. If the opening is large, think beyond the glass size. You may need more rod width, extra panel fullness, a higher mount, or a product designed for oversized coverage.
For wide openings, compare Extra Wide Curtains before choosing the final panel plan. For very tall windows, check the finished length carefully and make sure the rod height, header style, and fabric weight all work together.
Large openings are also where measuring mistakes become more visible. A curtain that is slightly narrow can look especially small on a sliding door. A rod mounted too low can make tall windows feel shorter. Measure the full area you want to cover, not only the glass.
What should you check before placing the order?
Once you have measurements, use How to Customize to choose size, fabric, lining, header style, and other custom details. If the fabric color or texture is not final, order swatches before placing the custom order. Measurements solve the fit question; swatches solve the color and fabric question.
Before you submit the order, check:
These checks keep the ordering process calmer. They also reduce the chance of choosing a beautiful fabric in the wrong finished size.
Final recommendation
Measure curtains by rod width, mounting height, panel length, and fullness. Measure roman shades by mount type, exact width, exact height, and frame depth. If you are not sure which product is right, decide that first, then measure.
Start with the Drapery Measuring Guide or the Roman Shade Measuring Guide, then move to How to Customize when you are ready to choose final options.
FAQ
Should curtains be wider than the window?
Yes. Curtains usually look and function better when the rod extends wider than the window frame. Extra width gives the panels room to stack away from the glass and helps improve coverage when the curtains are closed.
Should roman shades be measured in more than one place?
Yes. Measure width and height in three places because window frames can be slightly uneven. This is especially important for inside mount roman shades.
What is the biggest measuring mistake?
The most common mistake is measuring only the glass instead of the full area that needs coverage. Curtains often need rod width and finished length; roman shades need mount style, depth, width, and height.
