How to Calculate the Amount of Sewing Thread Consumption

Sewing thread consumption 
For a disciplined garments costing, it’s very important issue to know sewing thread consumption. For making a garment, the needed amount of sewing thread or making seam is called sewing thread consumption. 

Thread consumption varies between stitch types to stitch type. 

Sewing thread

Classification of stitch: 

1. Stitch type-101(Single needle chain stitch)
2. Stitch type-301(single needle lock stitch)
3. Stitch type-401(single needle chain stitch)
4. Stitch type-504(three thread over edge stitch)

We need to remember four theoretical equation for determining actual thread consumption for sewing 1 inch or making 1 inch of seam. 

<<For stitch type-101>> 
Thread consumption (C) = 3 + 2TS 

<<For stitch type-301>> 
Thread consumption (C) = 2 + 2TS 

<<For stitch type-401>> 
Thread consumption(C)= 4 + 2TS 

<<For stitch type-504>> 
Thread consumption (C) = 3 + 4WS + 4TS 

Here, 
T = Seam thickness 
S = Stitch density 
W = Seam’s width 

Mathematical Problem:-01 
If the thickness of seam 0.005 and stitch number per inch is 9, Determine thread consumption for stitch type-101? 

Solution: 

Given that,

Thickness of Stitch (T) = 0.005 
Stitch density (S) = 9 per inch 
Thread consumption =? 

We know , For stitch type-101 

Thread consumption = 3 + 2TS 

= 3 + 2 x 0.005 x 9 

= 3.09 inch (ANS) 

Mathematical problem:-02.
If thickness of seam and stitch density is respectively 0.01 and 10 per inch. Find out thread consumption for Stitch type-301? 

Solution: 

Given that,

Thickness of Stitch (T) = 0.01 
Stitch density (S) =10 per inch 
Thread consumption = ? 

We know, For stitch type-301 

Thread consumption (C) = 2 + 2TS 

= 2 + 2 x 0.01 x 10 

= 2.2inch (ANS) 

Mathematical problem:-03.
Seam’s thickness 0.015 and Stitch density per inch 15, Then what amount of thread will be needed for making 1 inch of seam for stitch type-401 ? 

Solution: 

Given that,

Thickness of Stitch (T) = 0.015 
Stitch density (S) =15 
Thread consumption = ?

Thread Consumption (C) = 4 + 2 TS 

= 4 + 2 x 0.015 x 15 

= 4.45 inch (ANS) 

Mathematical problem:-04.
For Stitch type-504, determine thread consumption for seam thickness 0.02, stitch density 15 per inch and seam’s width 1/4ʹʹ ? 

Solution: 

Given that,

Thickness of Stitch (T) = 0.02  
Stitch density (S) =15 
Width (W) =1/4ʹʹ 

Thread consumption (C) =3 + 4 WS + 4 TS 

= 3 + 4 x ¼ x 15 + 4 x 0.02 x 15 

= 3 + 15 + 1.2 

= 19.2 inch (ANS)