Why accuracy is essential
Roman blinds are all about elegance and smooth folds – but they only achieve that polished look if they fit perfectly. A blind that’s too small leaves gaps, and one that’s too large won’t sit neatly. Taking careful measurements from the outset ensures your blinds look stunning and work effortlessly.
Tools you’ll want to have ready
Before you begin, gather these essentials:
- A firm metal tape measure (for dependable accuracy)
- A pencil for noting down your figures
- A notepad or paper to keep things organised
- A step stool if you’re dealing with tall windows
Choosing recess or exact fitting
First, decide how you’d like your Roman blind to sit:
- Recess fit (inside the window): A neat, built-in look that works best when your recess is straight and unobstructed.
- Exact fit (outside the recess): The blind is mounted beyond the window, covering more of the frame or wall. This option helps block light more effectively and is ideal if the recess is shallow or uneven.
The method you select determines how you take your measurements.
Step-by-step measurement guide
Here’s the practical walkthrough to help you measure correctly.
Working out the width
- Recess fit: Take three width measurements inside the recess – at the top, middle, and bottom. Record them all and use the smallest figure as your final width.
- Exact fit: Measure the total width you’d like the blind to cover, adding around 7–10cm to each side for effective coverage.
Measuring the drop
- Recess fit: Measure the height inside the recess in three places – left, centre, and right. Use the shortest measurement so your blind won’t catch.
- Exact fit: Measure from the point above the window where you’d like the blind to sit, down to your preferred end point. Add a little extra if you’d like fuller coverage.
Double-check before you order
It’s all too easy to transpose numbers or misread the tape. Always remember: measure twice, cut once. That extra minute of checking can save a costly mistake later.

Mistakes you’ll want to avoid
Keep an eye out for these common errors:
- Only measuring in one spot rather than three
- Overlooking obstructions like handles, tiles, or radiators
- Using a flexible fabric tape measure that may stretch
- Rounding your numbers instead of writing them exactly
Why professional measuring can be worthwhile
Measuring Roman blinds yourself is perfectly doable, but for complete peace of mind, a professional service is the safest option. Experts like Kelly’s Blinds will take care of everything – from measuring to fitting – leaving you with blinds that are installed flawlessly and stress-free.
Next step once you’ve measured
With your figures ready, it’s time for the fun part – choosing your blinds. Explore the elegant range of Roman Blinds to find the perfect style for your home, whether you prefer something timeless, modern, or bold.
FAQ – How to Measure Roman Blinds?
Should I measure in centimetres or inches?
Centimetres (to the nearest millimetre) give the most precise results and are recommended when ordering.
Do Roman blinds need extra allowance?
For exact fits, yes. Adding 7–10cm to each side of the window width helps block light and ensures good coverage.
Can I use the same measurement for identical windows?
No. Even windows that appear the same can vary slightly, so always measure each window individually.


