Sewing Thread Consumption Formula with Example

Sewing Thread Consumption Formula with Example
Noor Ahmed Raaz
B.Sc. in Apparel Manufacturing
Asst. Merchandiser at A.M.C.S Textile Ltd

Sewing Thread Consumption
Sewing thread is required for seam sewing/assembling, overlocking, various types of stitching, buttonholing, label attachment etc. Besides, it is important to know the amount of thread consumed in a sewn product. We often need figure out thread consumption of various items like Shirt, Shorts, Tank tops and Pants etc. Thread consumption means how much thread we need to stitch a product.

Thread consumption can be determined in several ways. To calculate the amount of thread in a seam, you can:
  • Measure the actual amount of thread consumed in a specific length of seam.
  • Calculate the thread consumption by using mathematical stitch formulas based on the thickness of the seam and the number of stitches per inch.
  • Calculate the thread consumption using A&E’s ANECALC spreadsheets.
ANECALC spreadsheets (Click on image for large size)

Stitch and seam: 401 SSa-1
Stitches per inch: 8
Thickness of the seam: .075 inches (measured with a micrometer)
Length of the seam: 42 inches or 1.17 yds.

Union Special 401 Chainstitch Chart

Consumption based on the mathematical equation – C = 4 + 2ts

C = 4 + 2(.075 X 8) = 5.20


t = thickness of the seam
s = stitches per inch

Here, 1.17 yds X 5.20 = 6.08 yds / seam.
=> 6.08 yds/seam X 1.15 = 7.00 yds per seam including a 15% waste factor.

*** A shirt having 104 inches 4 Threads Over lock stitches, 52 inches Flat lock stitches, 20 inches 1 Needle Chain stitches, 15 inches Single Needle Plain Machine stitches, GSM is normal, find out its thread consumption in meters? 

Answer: {(104 x 19) + (52 x 32) + (20 x 5) + (15 x 2.75) + 10%} / 39.37 = 106.71 Meters. (39.37 inches = 1 Meter)

*** Suppose, we want to buy thread cones with 2000 meters thread, now figure out how many cones do we need to stitch 3000 pcs of garments, per garment’s thread consumption 106.71 meters? 

Answer: 106.71 x 3000 / 2000 = 160 cones.

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