Fabric & Textiles Converter
By KAMP Inc. / UnitOwl · Last reviewed:
Fabric and textile measurements blend weight, length, count, and coverage in systems that vary by tradition, material, and country. Thread count, denier, grams per square meter (GSM), yarn count — each tells a different story about a fabric's characteristics. Whether you're sourcing materials, reading care labels, or comparing product specifications, understanding these units helps decode what manufacturers are actually describing.
Popular Fabric & Textiles Conversions
GSM: Grams Per Square Meter
Grams per square meter (GSM or g/m²) is the most universally useful fabric weight measurement. It tells you how much a standard area of fabric weighs, which correlates directly with thickness, warmth, durability, and drape. Lightweight fabrics (under 150 GSM) include chiffon, georgette, and shirting cotton — suitable for summer garments and linings. Medium-weight fabrics (150–350 GSM) cover most everyday apparel: denim at 280–450 GSM, jersey knit at 150–220 GSM, fleece at 200–300 GSM. Heavyweight fabrics (over 350 GSM) include canvas, upholstery fabric, and heavy outerwear materials. Bed sheet thread count is often cited instead of GSM, but GSM is more reliable: a 400 GSM percale sheet typically outperforms a cheap 1,000-thread-count sheet made from thin, twisted yarns.
| Fabric Type | Typical GSM |
|---|---|
| Chiffon / voile | 15–50 GSM |
| Dress shirt cotton | 100–140 GSM |
| T-shirt jersey | 150–200 GSM |
| Denim (light) | 280–320 GSM |
| Canvas / workwear | 350–500 GSM |
| Heavy outerwear | 500–800 GSM |
Denier, Tex, and Yarn Count Systems
Yarn and fiber fineness is measured in denier (D) or tex. Denier is the mass in grams of 9,000 meters of fiber: a lower denier means a finer, lighter fiber. Microfiber is typically defined as under 1 denier per filament (dpf). Pantyhose might use 15–20 denier nylon; winter tights use 50–80 denier; heavy stockings use 100+ denier. Tex is the metric equivalent: grams per 1,000 meters (tex = denier / 9). For cotton and other natural fibers, the English Cotton Count (Ne) system works in reverse — Ne measures how many 840-yard hanks weigh one pound, so higher Ne means a finer yarn. Ne 1 is very coarse rope yarn; Ne 80 is fine combed cotton for high-end shirting. Ne 30 is typical for T-shirts.
Fabric Width and Yardage
Fabric is sold by the yard (US) or meter (elsewhere), in standard widths that vary by fabric type. Quilting cottons are typically 44–45 inches (112 cm) wide. Home decorating and upholstery fabric is often 54–60 inches (137–152 cm) wide. Fashion fabric may come in 60 inches (152 cm), 72 inches (183 cm), or even wider for specialty applications. When converting between yards and meters: 1 yard = 0.9144 meters; 1 meter = 1.094 yards. A sewing pattern that calls for 2.5 yards requires 2.29 meters. When fabric widths differ from the pattern's specified width, you need to recalculate yardage: more fabric is required when the bolt is narrower; less when it is wider. Online fabric calculators handle this by computing total square area needed.
Sources & References
- NIST — Units and Conversion Factors — Official unit conversion factors from the National Institute of Standards and Technology.
- BIPM — The International System of Units (SI) — International SI unit definitions from the International Bureau of Weights and Measures.