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GSM Calculator
Fabric GSM from weight and sample area. Verify supplier quality.
EPI/PPI Thread Density · Ne / Tex / Denier · Crimp & Waste Allowance · kg & lbs
Warp & Weft Yarn Consumption Calculator
Estimate warp yarn weight, weft yarn weight, and finished fabric GSM for any woven fabric order. Supports Ne, Tex, and Denier count systems with separate crimp and waste allowances for warp and weft. Results in kg and lbs — suitable for weavers, fabric merchandisers, and sourcing teams.
Based on standard textile engineering formulas · ASTM D3776 & ISO 1139 aligned · Last reviewed: June 2026
ASTM D3776 Aligned
Standard textile weight test method for GSM estimate
Ne, Tex & Denier
All major yarn count systems with auto-conversion
Crimp & Waste
Separate crimp and waste allowances for warp and weft
kg & lbs Output
Results in both metric and imperial for global mills
Step By Step
How to Use This Calculator
6 steps
- Enter Ends Per Inch (EPI) — the warp thread density, e.g. 68 for standard poplin.
- Enter Picks Per Inch (PPI) — the weft thread density, e.g. 60.
- Enter fabric width in inches (e.g. 58") and order length in metres.
- Under Warp Yarn Parameters: enter warp count value, select the count unit (Ne, Tex, or Denier), warp crimp % (5–12% for most plain weaves), and warp waste %.
- Under Weft Yarn Parameters: enter weft count, select unit, weft crimp % (2–8%), and weft waste %.
- Read the results: total ends, warp and weft yarn weights in kg and lbs, total fabric area, estimated GSM, and linear yarn yield per yard.
Worked Example
Example: 40s×40s 133×72 Poplin, 1,000m Order
Use this sample to sanity-check your inputs and understand what the final result represents.
- 1Fabric: 40/1 Ne × 40/1 Ne, 133 EPI × 72 PPI, 58 inches wide, 1,000 metres
- 2Warp crimp: 8% | Warp waste: 3% | Weft crimp: 4% | Weft waste: 5%
- 340 Ne converts to Tex: 590.5 ÷ 40 = 14.76 Tex
- 4Total ends: 133 × 58 = 7,714 ends
- 5Warp weight (net): (7,714 × 1,000 × 1.08 × 14.76) / 1,000,000 = 122.8 kg
- 6Weft weight (net): (72 × 39.37 × 1,000 × (58 × 0.0254) × 1.04 × 14.76) / 1,000,000 = 100.1 kg
Final Result
Gross warp (incl. 3% waste) ≈ 126.5 kg | Gross weft (incl. 5% waste) ≈ 105.1 kg | Total yarn ≈ 231.6 kg
Methodology
Warp & Weft Yarn Consumption Formulas
This section explains the calculation logic, assumptions, and source material used to make the result more trustworthy and easier to verify.
WARP YARN (g): Weight = (Total Ends × Order Length (m) × (1 + Crimp%) × Tex) / 1,000 Total Ends = EPI × Fabric Width (inches)
WEFT YARN (g): Weight = (PPI × 39.37 × Order Length (m) × Width (m) × (1 + Crimp%) × Tex) / 1,000 Width (m) = Fabric Width (inches) × 0.0254
CONVERSION: Tex = 590.5 ÷ Ne | Tex = Denier ÷ 9
FINISHED FABRIC GSM (estimate): GSM ≈ (Warp net g + Weft net g) / Fabric area (m²)
Typical Crimp Values by Weave Structure
Crimp percentage varies with weave interlacing frequency. Use these reference values when actual test data is unavailable.
| Weave Structure | Warp Crimp | Weft Crimp | Typical Fabric Example |
|---|---|---|---|
| Plain Weave | 5 – 10% | 3 – 6% | Poplin, Muslin, Voile |
| 2/1 Twill | 4 – 8% | 2 – 5% | Twill fabric, Gabardine |
| 3/1 Twill (Denim) | 5 – 9% | 2 – 4% | Denim, Drill |
| Satin / Sateen | 2 – 5% | 4 – 8% | Satin, Sateen, Chino |
| Oxford / Panama | 6 – 12% | 4 – 8% | Oxford shirt fabric, Panama |
| Dobby Patterns | 8 – 15% | 4 – 10% | Dobby shirting, Jacquard |
Frequently Asked Questions — Warp & Weft Yarn Consumption
What is warp and weft yarn consumption in woven fabric?
Warp yarns run lengthwise (parallel to the selvedge) along the loom, while weft (or filling) yarns run crosswise from selvedge to selvedge. Yarn consumption is the total weight of warp and weft yarn required to produce a given length or order of woven fabric. It is expressed in kilograms (kg) or pounds (lbs) and depends on thread density (EPI and PPI), yarn count (fineness), fabric width, order length, weave crimp, and waste allowance.
What is EPI and PPI in weaving?
EPI (Ends Per Inch) is the number of warp threads per inch of fabric width. PPI (Picks Per Inch) is the number of weft threads (or picks) per inch of fabric length. Together, EPI and PPI define the thread density of a woven fabric and are key inputs in calculating yarn weight. Higher EPI/PPI values at the same yarn count produce a tighter, heavier fabric with higher GSM.
What is crimp allowance and why does it matter?
Crimp is the undulation (waviness) that occurs in both warp and weft yarns when they interlace with each other on the loom. Because a crimped yarn follows a curved path rather than a straight line, it is longer than the finished fabric dimension. Crimp percentage = ((crimped yarn length − fabric dimension) / fabric dimension) × 100. For example, a warp crimp of 8% means the warp yarn is 8% longer than the actual fabric length. This crimp must be added to the calculation to get the true yarn consumption. Plain weave typically has 5–12% crimp; denser weaves can have less or more depending on the structure.
How do I convert Ne, Tex, and Denier yarn counts?
Ne (English Cotton count) is an indirect system — higher Ne means finer yarn. Tex is a direct system where higher Tex means coarser yarn. Denier is also direct. Conversion formulas: Tex = 590.5 ÷ Ne; Denier = Tex × 9; Ne = 590.5 ÷ Tex. Our calculator accepts Ne, Tex, or Denier for both warp and weft yarns and converts automatically to Tex for the internal weight calculation. These conversions follow ISO 1139 yarn count standards.
What is warp waste in weaving and what percentage should I use?
Warp waste occurs during beam warping (end splice joins), loom start-up, draw-in of warp ends (threading the loom heddles and reed), and at the end of each warp beam (lashing-in waste). For standard shuttle and shuttleless looms, warp waste typically ranges from 2% to 5% of the total warp yarn. Selvedge waste for rapier looms (with leno selvedge) can add another 1–2%. In practice, mills in Bangladesh use 3–5% as a safe warp waste allowance.
What is weft waste and how is it calculated for a shuttleless loom?
Weft waste on shuttleless looms (rapier, projectile, airjet, waterjet) primarily comes from weft thread ends trimmed at both selvedges (typically 2–3 cm per pick per side), pirn changes or weft yarn joining, and weft breakage repairs. Total weft waste for industrial weaving mills typically ranges from 3% to 8%. For airjet looms, waste is lower (3–5%) because the weft insertion is contactless; rapier looms generate slightly higher waste (4–7%) due to longer trimmed ends.
How is fabric GSM estimated from warp and weft yarn data?
An approximate fabric GSM (grams per square metre) can be estimated from the net yarn weights before waste is added. GSM ≈ (Warp net weight in grams + Weft net weight in grams) ÷ fabric area in m². However, this is a theoretical yarn GSM, not the finished fabric GSM, which is also influenced by sizing (starch applied to warp yarn), finishing processes (calendering, mercerising, compacting), and final relaxation shrinkage after washing. The actual finished GSM should always be verified by cutting and weighing a 10×10 cm swatch per ASTM D3776 or ISO 12127.
Disclaimer: This calculator provides planning estimates based on standard textile engineering formulas (ASTM D3776, ISO 1139). Actual yarn consumption may vary due to loom type, reed shrinkage, sizing pickup, finishing processing, and actual crimp measured on the loom. Always conduct a physical weave trial and actual GSM test before finalising yarn purchase orders. CostNest is not responsible for material planning shortfalls or overstock.