Yarn Weight Converter
Convert between tex, denier, WPI, and standard yarn weight categories for knitting and weaving.
Type in any field — the others update instantly.
Yarn weight describes the thickness (linear density) of yarn.
Key relationships:
- Tex = grams per 1,000 meters of yarn
- Denier = grams per 9,000 meters of yarn
- 1 tex = 9 denier (exact)
- 1 denier = 0.1111 tex
WPI (Wraps Per Inch): WPI measures how many times yarn wraps around a ruler per inch. Thicker yarn = fewer wraps. Thinner yarn = more wraps.
Standard yarn weight categories (approximate):
| Category | Tex | Denier | WPI |
|---|---|---|---|
| Lace (0) | 25–50 | 225–450 | 30–40 |
| Fingering (1) | 50–100 | 450–900 | 19–22 |
| Sport (2) | 100–150 | 900–1,350 | 15–18 |
| DK (3) | 150–200 | 1,350–1,800 | 12–14 |
| Worsted (4) | 200–300 | 1,800–2,700 | 9–11 |
| Bulky (5) | 300–450 | 2,700–4,050 | 7–8 |
| Super Bulky (6) | 450+ | 4,050+ | 5–6 |
WPI is an approximation since it depends on fiber type and twist.