HOW TO CALCULATED THE SEWING THREAD CONSUMPTION

 

 THE SEWING THREAD CONSUMPTION DETAILS AS BELOW:

The quantity of thread that will be required for sewing a garment is called sewing thread consumption for that garment. It is generally expressed in length. To find out the consumption of thread for production of garment is very much important, because for determination of costing of garments, need to know or to find out the consumption of thread.

Actual thread consumption for a unit length of seam depends on the following factors. 

1. Stitch Classes
2. Stitches per inches (SPI)
3. The thickness of the seam (fabric thickness)
4. Thread tension
5.  Thread count (thickness of sewing thread)

So you are suggested to calculate garment thread consumption by your own. You can develop a multiplying factor according to your product categories and requirement using the following steps.

Thread Consumption Ratio for Various stitch Types:

Class	Type of Stitch	Thread Ratio (cm)	No. Of Needles	Needle Thread    (%)	Looper Thread (%)
301	Lock Stitch	2.5	1	50	50
101	Chain Stitch	4.0	1	100	0
401	Two Thread Chain Stitch	5.5	1	25	75
304	Zigzag Lock Stitch	7.0	1	50	50
503	Two Thread Over edge Stitch	12.0	1	55	45
504	Three Thread Over edge Stitch	14.0	1	20	80
512	Four Thread Mock Safety Stitch	18.0	2	25	75
516	Five Thread Safety Stitch	20.0	2	20	80
406	Three Thread Covering Stitch	18.0	2	30	70
602	Four Thread Covering Stitch	25.0	2	20	80
605	Five Thread Covering Stitch	28.0	3	30	70

STITCH CLASS	FORMULA	REMARK
301	C = (2N + 2T) x S	N= Length of Each Stitch
101	C = (3N + 2T) x S	T = Thickness of Fabric or Seam
401	C = (4N + 2T) x S	S = The Number of Stitches Per Inch (SPI)
304		C = Thread Consumption for Each inch of Seam
503		W = Seam Width
504	C = (3N + 4W +4T) x S
512
516	C = 2S(2W+3T) + 9
406	C = (7N + 2S)(T+W)
602	C = (8N+S)(5W+4T)
605	C = (10N+2S)(2W+3T)

2^ND AND EASY WAY TO CALCULATION OF THREAD CONSUMPTION:

Machine Wise Per Inch Sewing Thread Required as below-

5 Thread O/L # 1 Inch = 24 Inch Thread Need

3 Thread O/L # 1 Inch = 14 Inch Thread Need

4 Thread O/L # 1 Inch = 22 Inch Thread Need

Lock Stitch Plain Machine (1 Needle) 1 Inch = 3 Inch Thread Need (Both Top + Bobbin)

Lock Stitch Plain Machine (2 Needle) 1 Inch = 6 Inch Thread Need (Both Top + Bobbin)

Fit of the Arm Chine Stitch 1 Inch = 9 Inch Thread Need (Both Top + Bobbin)

Flat Lock Machine (4 Thread) per inch = 22 Inch Thread need

Flat Lock Machine (3 Thread) per inch = 17 Inch Thread need

Bar tack 1/2 Inch = 17 Inch Thread Need

Hole Eyelet 1 Inch = 22 Inch Thread Need (Both Top + Bobbin)

FOR EXAMPLE:

SEWING THREAD CALCULATION FOR T-SHIRT AS BELOW-

THE BELOW POINT NEED TO MAKE BY 4 THREAD OVER LOCK MACHINE-

SHOULDER JOIN MEASUREMENT = 21 CM

NECK JOIN MEASUREMENT = 60 CM

SLEEVE JOIN MEASUREMENT = 104 CM

SIDE JOIN MEASUREMENT = 66 CM

TOTAL MEASUREMENT WITH 4 THREAD OVER LOCK MACHINE= 251 CM

 

THE BELOW POINT NEED TO MAKE BY FLAT LOCK MACHINE-

SLEEVE HEM = 68 CM

BODY HEM = 96 CM

BACK TAP PIPING & T/S = 46 CM

FRONT NECK TOP STITCH = 36 CM

TOTAL MEASUREMENT WITH FLAT LOCK MACHINE = 246 CM

THE BELOW POINT NEED TO MAKE BY PLAIN MACHINE/LOCK STITCH

LABEL STITCHING = 5 CM

NECK RIB STITCHING = 5 CM

TOTAL MEASUREMENT WITH PLAIN MACHINE= 10 CM

 

SO

Single Needle Lock Stitch (Plain Machine) = 10/2.54 (Here Note- 1 inch = 2.54 cm)

 = 3.94 Inch X 3 (Lock Stitch Plain Machine (1 Needle) 1 Inch = 3 Inch Thread Need See The Above in Blue) = 11.82 Inch

4 Thread Over Lock Machine = 251/2.54 = 98.82 X 22 = 2174 Inch

Flat Lock Machine (4 Thread) = 246 / 2.54 = 96.85 X 22 = 2131 Inch

TOTAL 11.82 + 2174 + 2131 = 4316.82/39.39 (Note: 1 Meter = 39.39 inch, Thread always calculated by meters)

= 109.60  MTR + 15%

= 126.04 MTR

(Generally 10% to 15% wastage of thread is added to the consumption derived. This wastage occurs due to shop-floor conditions like machine running, thread breakage, repairs, etc)

For betterunderstanding you can see the video

Average Sewing Thread Consumption:

The below table gives the average thread lengths consumed for different types of garments, drawn from our experience.

Items	Average Thread Consumption (Meter)
Blouse	120
Bra	55
Brief (Men's)	50
Business Suit trouser	300
Costume (2 pcs)	400
Jacket (Classic Nylon Padded)	500
Jacket (Denim )	450
Jacket (Twill)	450
Night Dress	200
Nylon Jogging Suit	500
Nylon Padded Jacket	350
Nylon Wind Breaker	300
Overall	400
Overall (Classic)	500
Pants (Denim 5 Pocket)	400
Pants (Long)	350
Pants (Long, Classic)	450
Panty	50
Payjama	200
Payjama Set	450
Polo shirt	180
Romper	350
Romper (Classic)	450
Sack coat/Blazer	190
Shirt (Woven, Classic Short sleeve)	150
Shirt (Woven, Classic,,Long sleeve)	175
Shirt (Woven, Full sleeve)	150
Shirt (Woven, Short sleeve)	125
Shorts	350
Shorts (Classic)	450
Skirt (Lined)	170
Skirt (Unlined)	110
Sweater	25
Sweat Shirt (Fleece)	280
Tank Top	50
T-shirt	125
Waist coat	70
Winter coat	265
Work Suit (2 pcs)	375

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