How to calculate sewing thread consumption for a garment

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The seam-length × thread-ratio method step by step: ratio table by stitch class, needle vs looper split, what changes consumption, wastage, and a full example from one garment to cones for the whole order.

2 min read · Updated 08 Oct 2026 · By Md. Saiful Islam · বাংলায় পড়ুন

Ordering too little thread stops the line; ordering too much ties up money in cones nobody uses. The standard method is simple:

Formula: Thread per garment = Σ (Seam length × Thread ratio) × (1 + Wastage %)

Step 1 - list every seam and its stitch class

Measure each seam on the sample or from the pattern, and note the machine / stitch class. Include bartacks, buttonholes and button sewing.

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