Yarn Weight and Crochet Hook Selection Guide

Start with the pattern gauge

The hook printed on a yarn label is a starting point. For a pattern, the required gauge and finished fabric matter more than the suggested hook size.

Make a swatch large enough to measure the center stitches, then wash it before deciding whether to change hooks.

Match the hook to the fabric

A smaller hook generally creates a firmer fabric, while a larger hook creates more drape and openness. Bags and baskets often need structure; garments and scarves usually benefit from movement.

• Use the same yarn weight as the pattern when learning substitution.
• Compare fiber content, yardage, and meters per gram, not only the weight label.
• Check that the washed swatch still has the intended drape and dimensions.

When substituting yarn

Buy enough total yardage for the size you are making and allow extra for swatching. Natural and synthetic fibers can behave differently after washing, so test the exact yarn before committing to a garment.