Measuring curtains correctly – instructions for perfect custom made curtains

Measuring curtains correctly is the most important step when ordering custom-made curtains. Even a few centimeters of difference can determine whether a curtain hangs properly or whether it's too short, too narrow, or too long. With the right sequence and a little care, however, measuring is easy. In this guide, we'll show you how, step by step.

Measuring curtains correctly: What you need

The equipment is simple:

• A rigid measuring tape or a meter stick (a soft tailor's measuring tape sags and distorts the length)
• Pen and notepad to write down every measurement immediately.
• A ladder or a sturdy step stool if the rail is mounted high.
• A second person to hold the measuring tape if you are measuring long distances

Step 1: First, mount the rail or rod.

Measure only after the track or rod is already mounted . The curtain's dimensions depend on the mounting system, not the window. Hang the track slightly wider than the window on both sides and as high up as possible. This makes the window appear larger and lets in more light when the curtain is open.

If no rail is yet mounted, plan the position and measure it using the planned height and width.

Step 2: Measure the width

Measure the width of the track or rod , not the width of the window. This is the most common mistake when measuring, as the curtain needs to hang along the entire length of the mounting.

The fabric itself is wider than the track to create beautiful folds. A good rule of thumb is 1.5 to 2.5 times the track width. 

Step 3: Measure the height

Measure from the top edge of the track or rod to the point where you want the curtain to end. There are three options, depending on your preference:

• Floating: The curtain ends approximately 1 to 2 cm above the floor. Practical, easy to care for, and ideal for use with radiators.
• Floor-length: The curtain just touches the floor.
• Down to the windowsill: An option for shorter curtains in the kitchen or office. The curtain ends just below the windowsill or right at it.

Tip: Floors are rarely perfectly level. Therefore, measure at three points – left, middle, and right – and note all three values. For a hanging or floor-length curtain, the smallest of the three values applies.

Important: The mounting method affects the height. You can read more about this in our articles on curtains with gliders and curtains with a gathered heading tape .

Step 4: Note it down and double-check.

Write down your measurements immediately, ideally in centimeters and specifying whether it's the width or the height. Double-check each measurement. And decide which type of fastener you want to use, as this is part of the order.

Typical errors when measuring

1. Measure the window width instead of the track width. The curtain should extend beyond the side of the window.
2. Measure before installation. If the rail is installed differently later, the dimensions will no longer be correct.
3. Measure in one spot only. Floors and walls are rarely straight, especially in older buildings.
4. Don't forget the radiator. A floor-length curtain in front of the radiator traps the heat. A hanging curtain is better here.
5. Use a soft measuring tape. It sags and gives readings that are too high.

How do you maintain your curtains?

So that your curtains retain their beautiful shape and color, one must not forget to care for them. Since they are constantly exposed to the light, it is not uncommon to detect discolorations on curtains, against which it is unfortunately difficult to fight.

If, on the other hand, your curtains get matte, it’s high time to wash them, because dust has accumulated. To do this, you can entrust them to a cleaning or follow the instructions on the label. Wash them once or twice a year so they stay clean and avoid bad odors. This makes the room even healthier and more pleasant.

Conclusion

Following the correct sequence – first mounting the track, then measuring the track width and height at several points and noting everything down – will help you avoid the most common mistakes. This ensures that custom-made curtains fit reliably.

Frequently Asked Questions About Measuring Curtains

1. How do I measure a window for curtains?

Measure the width of your curtain pole or track rather than just the window frame. For the height, measure from the top of the pole or track to your desired curtain length, such as the windowsill, below the sill, or the floor.

2. How wide should curtains be compared to the window?

For a full, elegant appearance, the combined width of your curtains should generally be 1.5 to 2 times the width of the curtain pole or track. For a more luxurious, gathered look, you can choose 2 to 2.5 times the width.

3. Should I measure curtains from the top of the window or the curtain rod?

Measure from the curtain rod or track, not the top of the window frame. If you want to make your ceilings appear taller, install the rod several inches above the window frame or closer to the ceiling.

4. How do I measure curtain length for floor-length curtains?

Measure from the top of the curtain rod or track to the floor. For curtains that just touch the floor, use the exact floor measurement. If you prefer a slight break or puddling effect, add approximately 1–3 inches, depending on your desired style.

5. How much extra width should I allow for curtain fullness?

Allow approximately 50% to 100% extra fabric width for standard fullness, depending on the fabric and heading style. Sheer curtains often look best with more fullness, while heavier curtains may need less.

6. How do I measure curtains for eyelet or grommet headings?

Measure the curtain drop from the top of the installed curtain pole to your desired endpoint, allowing for the position of the eyelets above the pole. Check the manufacturer's instructions because the fabric above the eyelets can affect the final hanging length.

7. Should both curtain panels have the same measurements?

Yes, if you want a symmetrical appearance, both panels should generally have the same width and length. However, you can use different panel widths when covering unusually wide windows or when your room layout requires an asymmetrical arrangement.

8. How do I measure curtains for a bay window?

Measure each section of the bay window separately, following the shape of the curtain track or pole. For a curved or angled bay window, consider using a flexible measuring tape and account for corners, bends, and any overlaps between panels.

9. How do I measure curtains for blackout coverage?

Measure the curtain track or pole wider than the window frame and extend the curtains beyond the sides wherever possible. For better light control, choose curtains that reach close to the floor and use suitable tracks, returns, or overlapping panels to reduce light gaps.

10. Can I measure curtains myself, or should I hire a professional?

You can measure curtains yourself using a metal tape measure, a pencil, and a notepad. Measure the width and drop carefully, record measurements in inches or centimeters, and double-check them before ordering. For large windows, bay windows, or custom-made curtains, professional measuring can help prevent costly mistakes.