The Global Yarn Glossary
Regional variations in terminology can make following an international pattern confusing. This guide breaks down the most common terms found in US, UK, and AU patterns.
UK & Australian Terminology
Used to define weight rather than physical strand count. 8-ply is equivalent to US DK weight.
A standard light-worsted weight yarn used extensively in UK patterns.
Slightly thicker than DK, equivalent to US Worsted weight.
North American Terminology
A very fine yarn, often called 4-ply in the UK and Australia.
A medium-weight yarn, the most common standard in the US. Equivalent to UK Aran.
Thick yarns used for warm garments and quick projects. Often interchangeable terms.
Technical Nuances
Is Worsted the same as Aran? ↓
For most projects, yes. However, US Worsted can span a wider range of thicknesses (9-12 WPI), while AU 10-Ply is usually strictly 10-11 WPI. Always check your gauge.
What does "Ply" actually mean in Australia? ↓
In Australia and the UK, "Ply" is a standardized thickness label, not a count of physical strands. An 8-ply yarn might only have 2 physical plies but the total thickness of a standard 8-ply (DK).