Yarn Substitution Helper

Compare your original yarn and substitute to check compatibility before you start your project.

Original Yarn

Weight Fiber Content WPI Gauge (sts per 4") Care Instructions

Substitute Yarn

Weight Fiber Content WPI Gauge (sts per 4") Care Instructions

This tool provides general guidance only. Always swatch with your substitute yarn before starting any project.

How to Use This Tool

Fill in the details for your original yarn (from the pattern) and your substitute yarn.
Click Compare Yarns to see a compatibility checklist and overall substitution rating.
A rating of Good means 3–4 factors match. Fair means 2 match. Risky means 0–1 match.

Weight: The most important factor. Mismatched weights require significant pattern adjustments.
Gauge: Even with matching weight, different yarns can knit/crochet at different tensions. Always swatch!
Fiber: Affects drape, warmth, care, and behavior. A cotton substitute for wool will drape differently and won't felt.
Care: If the finished item will be machine washed but the substitute requires hand washing, reconsider.