These are the generally accepted standards for WPI. I actually classify my lace as yarn that has 20 or more wraps per inch, and cobweb to be anything 25 or more wraps per inch.
| WPI | Yarn Type | YPP |
|---|---|---|
| 18+ | Lace | 2600+ |
| 16-17 | Fingering/Sock | 1900-2400 |
| 13-15 | Sport | 1200-1800 |
| 11-12 | Worsted | 900-1200 |
| 9-10 | Bulky | 600-800 |
| < 8 | Super Bulky | 400-500 |