Quick Answer: How to Measure S-Fold Curtains
S-Fold curtains are measured using the S-Fold track system rather than window width alone.
The curtain width is calculated based on the number of carriers on the track and the button spacing of the curtain header tape.
For S-Fold tracks with button-style carriers:
Core formula:
Number of carriers × button spacing = flat curtain width
Standard S-Fold system:
Button spacing: 12.5 cm
Curtain drop is measured from the bottom of the track body to the desired finish point.
Video Demonstration: S-Fold Curtain Measurement Guide
Learn how to measure S-Fold curtains correctly with our step-by-step guide.
The demonstration covers:
- Track length measurement
- Carrier count
- Carrier spacing
- Button spacing
- Flat curtain width calculation
- Curtain drop measurement
Watch the S-Fold Curtain Video
Key Measurement Rules
S-Fold curtains are not measured by window width alone.
The correct measurement method uses:
- Track length
- Number of carriers
- Carrier spacing
- Button spacing
- Flat curtain width calculation
- Curtain drop measurement
Each element works together to create a consistent S-shaped wave pattern.
What Is an S-Fold Curtain System?
S-Fold curtains are designed to create smooth, continuous S-shaped waves using a specialised curtain track system.
Unlike traditional curtain headings, S-Fold curtains rely on the track system to control the wave spacing and final appearance.
The system works through three key components:
1. Specialised S-Fold Track
The S-Fold track uses linked key-shaped carriers to create evenly spaced wave positions along the track.
The curtain attaches to these carriers, allowing the fabric to form a smooth and continuous S-shaped wave.
2. Curtain Tape and Button Connection
A special S-Fold tape is sewn onto the back of the curtain header.
The buttons on the tape snap into the carriers on the track, creating evenly spaced connection points that form the S-shaped folds.
3. Curtain Fabric
The fabric is evenly distributed between each connection point to create a consistent S-shaped drape.
This creates a clean, modern appearance with smooth and uniform waves.
Step 1: Measure Track Length
Start with your track length.
Recommended track length = window width + returns on both sides
Returns are the extra track length extending beyond each side of the window.
They help to:
- Reduce light gaps
- Improve privacy
- Allow curtains to stack neatly when open
- Create a more balanced appearance
For existing S-Fold tracks, simply measure the total track length.
Step 2: Count the Carriers
Next, count the number of carriers on your S-Fold track and confirm the carrier spacing.
In an S-Fold system, carriers are key-shaped connection points linked together by a cord inside the track.
They are where the curtain attaches and where each S-shaped wave is formed.
You may find double-sided carriers at the ends of the track.
These should be counted as two carriers, because each side provides one curtain attachment point.
Most S-Fold systems work best with an even number of carriers to maintain balanced wave alignment.
When the cord system is fully extended, the distance between carriers is usually:
- Approximately 6 cm — the most common S-Fold system
- Approximately 8 cm — available on some systems
Step 3: Confirm Button Spacing
S-Fold curtains use a matching button spacing system on the curtain header tape.
Our standard S-Fold system uses:
12.5 cm button spacing
This is the spacing between the buttons sewn into the back of the curtain tape.
It is designed to match the most common S-Fold track system with approximately 6 cm carrier spacing, creating the correct S-shaped wave formation.
If your S-Fold track uses a different carrier spacing, the button spacing and flat curtain width calculation may need to be adjusted to ensure the correct wave pattern.
Step 4: Calculate Flat Curtain Width
The key formula is:
Flat curtain width = Number of carriers × Button spacing
When counting carriers, remember:
Double-sided carriers at the ends of the track count as 2 carriers.
For example:
80 carriers × 12.5 cm button spacing
= 1000 cm total flat curtain width
This gives the total curtain width before the curtain is attached to the track and formed into S-shaped waves.
For a two-panel curtain set, this total flat width is usually divided between the two panels.
For example:
1000 cm total flat width ÷ 2 panels
= 500 cm flat width per panel
Step 5: Measure Curtain Drop
Curtain drop is measured from:
Bottom of the track body → desired finish point
Allow approximately 5 mm clearance between the bottom of the track body and the curtain header to ensure the correct hanging position.
Key System Summary
S-Fold curtains are a structured system built around:
- Track length
- Number of carriers
- Carrier spacing
- Button spacing
- Flat curtain width
- Drop measurement
Correct calculation ensures:
- Consistent S-shaped waves
- Even fabric distribution
- Smooth curtain operation
- Professional installation results
Why S-Fold Curtains Are Different
S-Fold systems provide a modern architectural look because:
- Wave spacing is controlled by the track system
- Curtain width is calculated rather than estimated
- Fabric movement remains consistent across the entire track
- The finished appearance is neat and symmetrical
This makes S-Fold curtains especially popular for contemporary homes, large windows, and floor-to-ceiling applications.
Common Measurement Mistake
A common mistake is measuring only the window width and choosing a curtain size based on that measurement.
The correct method is:
Measure the track → count the carriers (double-sided carriers count as 2) → confirm carrier spacing → confirm button spacing → calculate flat curtain width → confirm drop
The track system determines the curtain size.
Frequently Asked Questions
1. How do I calculate S-Fold curtain width?
S-Fold curtain width is calculated by multiplying the number of carriers on the track by the button spacing on the curtain header tape.
Formula:
Number of carriers × button spacing = flat curtain width
2. What is the standard button spacing for S-Fold curtains?
The standard S-Fold button spacing is 12.5 cm.
This spacing is designed to match the most common S-Fold track systems with approximately 6 cm carrier spacing.
3. How do I measure S-Fold curtain drop?
Measure from the bottom of the track body to your desired finish point.
Allow approximately 5 mm clearance between the track body and the curtain header for the correct hanging position.
4. Can I use my existing S-Fold track?
Yes. If you already have an S-Fold track, measure:
- Track length
- Number of carriers
- Carrier spacing
These measurements allow the required curtain width to be calculated accurately.
5. Do S-Fold curtains need a special track?
Yes. S-Fold curtains are designed to work with specialised S-Fold tracks that use linked carriers to create the continuous S-shaped wave pattern.
Need Help With Your Curtain Measurements?
If you are unsure about your S-Fold track, carrier count, or measurements, our team can help you calculate the correct curtain width and drop based on your actual track setup.
Email: care@homecurtains.com.au
HomeCurtains — Custom S-Fold curtains made simple.
