Thread Consumption Calculator (Meters & Cones)
Estimate total sewing thread consumption in linear meters and required 5,000m thread cones for an entire apparel production order.
Thread looks like a small cost on a garment cost sheet, but across a full order it becomes hundreds of thousands of metres and dozens of cones — and a thread stock-out stops sewing lines just as surely as missing fabric. This calculator converts the seam length in a garment and the stitch type into metres per garment, total metres for the order, and the number of standard 5,000 m cones to book. It feeds the same cost sheet as the Fabric Cost per Garment Calculator, and the order quantity it uses should match the quantity on that sheet.
What is Thread Consumption?
Thread consumption is the length of sewing thread used to make one garment, plus the waste allowed for thread tails, re-stitching, cone changeover and breakage. It depends on two things: how many metres of seam the garment has, and how much thread each stitch type consumes per metre of seam — the thread ratio.
A lockstitch uses roughly 2.5 to 3 times the seam length in thread, because the needle and bobbin threads interlock. An overlock stitch uses far more — roughly 14 to 18 times — because looper threads wrap around the fabric edge. That is why a garment with long overlocked seams can need more thread than a garment with long lockstitched seams, even at a shorter total seam length.
The calculator works in standard 5,000 m cones and always rounds cones up: a fraction of a cone cannot be bought, and the last cone covers the shortfall. Booking a rounded-down cone count guarantees a shortage at the end of the order.
Formula
Net thread per garment = Seam metres x Thread ratio Gross thread per garment = Net x (1 + Wastage % / 100) Total thread = Gross x Order quantity Cones = Total metres / 5,000, rounded up
- Seam metres: total stitched seam length in one garment, in metres.
- Thread ratio: metres of thread per metre of seam — lockstitch around 2.5 to 3.0, 4-thread overlock around 14 to 18, coverstitch around 18, as shown in the tool.
- Wastage %: allowance for tails, rework and breakage. The tool defaults to 10 percent.
- Order quantity: total garments in the order.
- Cone: a standard 5,000 m cone in this tool.
How to Calculate
- Add up the seam lengths in the garment from the tech pack or a sample garment — every stitched seam, not just the longest one.
- Choose the thread ratio for the stitch type. If the garment mixes stitch types, calculate each stitch type separately and add the results, because the tool takes one ratio per run.
- Enter the wastage percentage. Ten percent is the tool default and a reasonable starting point; raise it for difficult fabrics or high rework rates.
- Enter the order quantity.
- Read metres per garment, total metres, and cones. Book the full cone count — never round cones down.
Example
For the same 10,000-piece T-shirt order used in the shrinkage guide, the main seams total 9 m of lockstitch per garment. Net thread is 9 x 3.0 = 27.0 m per garment, and with 10 percent wastage the gross figure is 27.0 x 1.10 = 29.7 m per garment. Across the order that is 29.7 x 10,000 = 297,000 m, which is 297,000 / 5,000 = 59.4 cones — rounded up to 60 cones. Booking only 59 cones would leave 2,000 m short, because 59 x 5,000 = 295,000 m against 297,000 m needed.
A second case shows why stitch type dominates: 4 m of overlock seam at a ratio of 14 gives net 56 m per garment and gross 61.6 m at 10 percent wastage. For 5,000 garments that is 308,000 m, or 61.6 cones rounded up to 62 cones — more than double the thread of the 9 m lockstitch garment, from less than half the seam length. For the fabric side of the same cost sheet, see the Fabric Cost per Garment Calculator.
Assumptions
- One thread ratio per run; mixed stitch types need separate runs added together.
- Cones hold 5,000 m. If a supplier sells a different cone size, convert the total metres yourself before ordering.
- Wastage is a single percentage for the whole garment; it does not vary by operation in this tool.
- The result is a length booking, not a price — multiply by the cone price separately for costing.
- Ratios are planning values from the tool, not laboratory measurements. Measure actual consumption on a sample garment for high-value orders.