Verified Mathematical Model & Formulation
Thread Required = Seam Length × Stitch Factor × (1 + Wastage %) 301 Lockstitch: 2.8x | 401 Chainstitch: 5.0x | 504 Overlock: 14.0x | 602 Coverstitch: 18.0x
Multiplies total seam length by empirical stitch consumption factors established by Coats and A&E thread technical manuals, then adds machine start/stop trim wastage.
Configurable Parameters & Standard Units
- Stitch Type (1=301 Lockstitch 2.8x, 2=401 Chain 5x, 3=504 Overlock 14x, 4=602 Cover 18x): (Default: 3 count)
- Seam Length per Garment (Meters): (Default: 6 m)
- Thread Wastage (%): (Default: 15 percent)
- Order Quantity (Garments): (Default: 1000 count)
Standard Worked Example & Practical Verification
Scenario: 5 meters of 504 3-thread overlock seam per T-shirt for an order of 2,400 pieces with 15% wastage.
Calculated Solution
80.5m per Piece (39 Cones for 2,400 T-shirts)
Practical Takeaway: Overlock and coverstitch seams consume dramatically more thread than standard lockstitch.
Frequently Asked Questions
Why does an overlock stitch consume 14 to 18 times the seam length?
Overlock loopers continuously wrap threads around the fabric edge in interlocking spirals on both the top and bottom surfaces, using substantial thread length per centimeter of seam.