From our factory cutting schedule

S-fold curtain fullness: the actual manufacturing numbers

By Curtain & Blind Co Updated 14 July 2026 7 min read

Fullness is the biggest single factor in how an S-fold curtain looks, and the easiest place for a window furnishings quote to stay vague. So here is the schedule our own Australian factory cuts from, published in full. Our stated spec is 100% fullness. As the table shows, that is the floor: every size we make comes out above it.

What fullness means, in plain terms

Fullness is the amount of extra fabric in a curtain compared with the track it hangs on. A curtain with 100% fullness carries 2 metres of fabric for every 1 metre of track. That extra metre is what forms the folds. A flat bed sheet nailed above a window has 0% fullness.

One number, two notations

Fullness is written as a percentage of extra fabric, or as a multiple of the track. They describe the same thing: 100% fullness and 2.0× fabric are identical.

1.8×80% fullness 2.0×100%, our stated spec 2.2×120% fullness 2.5×150% fullness 2.08× to 3.57×what we actually cut

Our spec says 100%. The factory cuts more.

The stated spec is the guaranteed minimum, not the actual amount. The actual amount is set by the S-fold hardware, and the hardware is generous. Three things push every curtain above the line.

1

Every fold takes 2 runners

The wave tape behind the heading carries a runner every 120mm of tape, and each fold uses a pair of them. Read down any two neighbouring rows of the table: one extra fold adds about 240mm of fabric across about 118mm of track. Every fold is born at just over double fabric.

2

You cannot cut half a fold

Fabric is allocated in whole folds only. Window widths rarely land exactly on a fold boundary, so the spare capacity ends up in the curtain. Narrow windows benefit most, which is why the smallest size in the schedule runs at 257% fullness.

3

A fixed allowance on every cut

Take any row of the table: the fabric equals roughly 2× the track, plus about 480mm per curtain on top. That built-in allowance is the same whether the track is 616mm or 7 metres, and it lifts every size clear of the 100% line.

107.9%the lowest actual fullness of any size we make (a 6,733mm one way draw)

130% to 195%the actual range across common window widths of 1.2m to 3.6m

257%the highest, on the narrowest centre pair (616mm)

0 of 83sizes in the schedule below 100% fullness (one fitting exception, flagged below)

The manufacturing table

These are the exact figures our factory works from for 100% S-fold curtains. A centre pair is two curtains meeting in the middle (our factory schedule calls it centre close). One way draw is a single curtain stacking to one side. The fullness column is simple arithmetic: fabric cut, divided by track length.

Find your window

Centre pair, 100% S-fold

Track length (mm)	Runners	Fabric per curtain (m)	Total fabric (m)	Fabric multiple	Actual fullness
616	6 × 2	2 × 1.10	2.20	3.57×	257%
852	8 × 2	2 × 1.40	2.80	3.29×	229%
1,088	10 × 2	2 × 1.60	3.20	2.94×	194%
1,324	12 × 2	2 × 1.80	3.60	2.72×	172%
1,560	14 × 2	2 × 2.10	4.20	2.69×	169%
1,786	16 × 2	2 × 2.30	4.60	2.58×	158%
2,022	18 × 2	2 × 2.60	5.20	2.57×	157%
2,258	20 × 2	2 × 2.80	5.60	2.48×	148%
2,494	22 × 2	2 × 3.10	6.20	2.49×	149%
2,740	24 × 2	2 × 3.30	6.60	2.41×	141%
2,976	26 × 2	2 × 3.60	7.20	2.42×	142%
3,222	28 × 2	2 × 3.80	7.60	2.36×	136%
3,468	30 × 2	2 × 4.00	8.00	2.31×	131%
3,704	32 × 2	2 × 4.20	8.40	2.27×	127%
3,940	34 × 2	2 × 4.50	9.00	2.28×	128%
4,186	36 × 2	2 × 4.70	9.40	2.25×	125%
4,422	38 × 2	2 × 4.90	9.80	2.22×	122%
4,658	40 × 2	2 × 5.20	10.40	2.23×	123%
4,894	42 × 2	2 × 5.50	11.00	2.25×	125%
5,140	44 × 2	2 × 5.70	11.40	2.22×	122%
5,376	46 × 2	2 × 5.90	11.80	2.19×	119%
5,612	48 × 2	2 × 6.10	12.20	2.17×	117%
5,858	50 × 2	2 × 6.30	12.60	2.15×	115%
6,094	52 × 2	2 × 6.70	13.40	2.20×	120%
6,330	54 × 2	2 × 6.90	13.80	2.18×	118%
6,576	56 × 2	2 × 7.10	14.20	2.16×	116%
6,812	58 × 2	2 × 7.40	14.80	2.17×	117%
7,048	60 × 2	2 × 7.60	15.20	2.16×	116%

Runners and fabric are shown per curtain × 2 (a centre pair is two curtains). For a single return to wall the schedule adds 20mm on each tape (80mm total return). For a double return it adds 105mm on each tape (165mm total return).

One way draw, 100% S-fold

Track length (mm)	Runners	Fabric cut (m)	Fabric multiple	Actual fullness
308	6	1.10	3.57×	257%
426	8	1.30	3.05×	205%
544	10	1.60	2.94×	194%
662	12	1.80	2.72×	172%
780	14	2.10	2.69×	169%
893	16	2.30	2.58×	158%
1,011	18	2.60	2.57×	157%
1,129	20	2.80	2.48×	148%
1,247	22	3.00	2.41×	141%
1,370	24	3.30	2.41×	141%
1,488	26	3.50	2.35×	135%
1,611	28	3.80	2.36×	136%
1,734	30	4.00	2.31×	131%
1,852	32	4.30	2.32×	132%
1,970	34	4.50	2.28×	128%
2,093	36	4.70	2.25×	125%
2,211	38	5.00	2.26×	126%
2,329	40	5.20	2.23×	123%
2,447	42	5.50	2.25×	125%
2,570	44	5.70	2.22×	122%
2,688	46	5.90	2.19×	119%
2,806	48	6.20	2.21×	121%
2,929	50	6.40	2.19×	119%
3,047	52	6.60	2.17×	117%
3,165	54	6.90	2.18×	118%
3,288	56	7.10	2.16×	116%
3,406	58	7.40	2.17×	117%
3,524	60	7.60	2.16×	116%
3,642	62	7.90	2.17×	117%
3,760	64	8.10	2.15×	115%
3,883	66	8.30	2.14×	114%
4,001	68	8.50	2.12×	112%
4,119	70	8.80	2.14×	114%
4,237	72	9.00	2.12×	112%
4,360	74	9.30	2.13×	113%
4,478	76	9.50	2.12×	112%
4,596	78	9.80	2.13×	113%
4,714	80	10.00	2.12×	112%
4,835	82	10.20	2.11×	111%
4,953	84	10.50	2.12×	112%
5,071	86	10.70	2.11×	111%
5,194	88	10.90	2.10×	110%
5,312	90	11.20	2.11×	111%
5,430	92	11.50	2.12×	112%
5,553	94	11.70	2.11×	111%
5,671	96	11.90	2.10×	110%
5,789	98	12.10	2.09×	109%
5,902	100	12.40	2.10×	110%
6,020	102	12.60	2.09×	109%
6,143	104	12.90	2.10×	110%
6,261	106	13.10	2.09×	109%
6,379	108	13.30	2.08×	108%
6,497	110	13.60	2.09×	109%
6,615	112	13.80	2.09×	109%
6,733	114	14.00	2.08×	108%

For a single return to wall the schedule adds 20mm (80mm total return). For a double return it adds 105mm (165mm total return).

The check worth doing: is anything under 100%?

We calculated the actual fullness of all 83 sizes in the schedule, looking for anything under the stated spec. There is nothing to flag. The lowest figure is 107.9%, on the widest one way draw we make.

The maths also rules it out between the listed sizes. Each fold contributes about 240mm of fabric across about 118mm of track, a ratio of just over 2.0. Even if a curtain built on a given fold count is stretched to the very next size up, the fabric multiple bottoms out at 2.05× the track, which is 104.7% fullness. An S-fold under 100% fullness cannot come off this schedule. The one fitting exception, face fit double curtains, is flagged below. For the same reason, an S-fold at 80% fullness (1.8× fabric) is not something this schedule can produce: the smallest multiple anywhere in it is 2.08×.

The one exception: face fit double curtains

Every figure above assumes a curtain with its own clear run of track. Face fit double curtains are the one configuration where fullness can sit below 100%. On face fit brackets the two tracks hang one in front of the other, and each curtain needs enough space to pass in front of or behind the other. We ease the fullness slightly so the two waves clear each other instead of catching.

It is a clearance decision, not a fabric saving, and it is the only case where our S-folds may come in under the stated spec. We flag it because transparency is the point of this page.

Why we quote 100% and not a bigger number

Because 100% is the only figure we can promise at every width. Actual fullness depends on where your track lands against whole folds, so it moves between 108% and 257%. We would rather publish the floor and show you the cutting table than advertise one flattering number.

The runner spacing is fixed so the wave hangs in even, continuous folds at any width. The schedule allocates the most fabric that spacing can carry while the wave still forms properly. If a quote gives you one exact fullness figure for every size, it is worth asking to see the table behind it.

The schedule sets the fold count. Order samples with free express post and check the drape in your own room, then measure up knowing exactly what we will cut for you.

Order Samples

Frequently Asked Questions

What is curtain fullness?

Fullness is the amount of extra fabric in a curtain compared with the track it hangs on. A curtain with 100% fullness carries 2 metres of fabric for every 1 metre of track. Written as a multiple, 100% fullness is 2.0 times the track.

What fullness are your S-fold curtains?

Our stated spec is 100% fullness, and that is the guaranteed minimum. The actual fullness cut by our factory runs from 107.9% on the widest single draw (6,733mm) to 257% on the narrowest pair. Common window widths land between roughly 130% and 195%. The full schedule is published on this page.

What is a track runner?

A runner (our factory schedule calls it a carrier) is the small glider that connects the curtain heading to the track. In an S-fold system every fold uses 2 runners, so the runner count in the table tells you exactly how many folds your curtain has.

Can an S-fold curtain have less than 100% fullness?

Not from the standard schedule. Each fold adds about 240mm of fabric across about 118mm of track, so every fold is cut at just over double fabric. We checked all 83 sizes and the lowest actual fullness is 107.9%. The one exception is face fit double curtains, where the front and back curtains each need space to pass one another, so we ease the fullness slightly and it can sit just under 100%. That is the only case, and it is a clearance decision, not a fabric saving.

Why do you quote 100% if the actual fullness is higher?

Because 100% is the only figure we can promise at every width. Actual fullness depends on where your track lands against whole folds, so it moves between about 108% and 257%. We publish the floor and let the cutting table show the rest.

Explore the range

Featured collections

All collections →

S-Fold Sheer Curtains