Yarn weights explained
Practical guidance: yarn weights explained.
Key principles
- Categories 0–7 help compare yarns but do not replace a swatch.
- Two yarns in one category may differ in elasticity and length.
- When substituting, also compare the fabric after washing.
Step-by-step process
- Record yarn, tool and project parameters.
- Make a small test and measure it without stretching.
- Compare the result with the target and change only one parameter at a time.
- Record the decision in the project journal so it can be reproduced.
Common mistakes
The most common mistake is treating label or pattern data as a guarantee. Technique, fibre, stitch and washing can change the result.