← Back to Glossary

Yarn Weight System

Definition

Classifies yarn thickness. UK often uses ply names; US uses numbers from 0 (lace) to 7 (jumbo). Always confirm whether a pattern uses UK or US terminology before starting. Swatch to verify gauge, then adjust hook size or tension to achieve the desired fabric and fit.

Examples

  • •

    DK (UK) ≈ #3 Light (US).

  • •

    Aran/Worsted ≈ #4 Medium.

Related Terms

WPI (Wraps Per Inch)

A way to estimate yarn weight by counting how many times it wraps around a ruler per inch. Always confirm whether a pattern uses UK or US terminology before starting. Swatch to verify gauge, then adjust hook size or tension to achieve the desired fabric and fit.

materialssizing