Crochet Yarn Weights Explained: What Do All Those Numbers Mean?

Crochet Yarn Weights Explained: 0–7 Yarn Weight Guide

Confused by yarn weights? Learn what yarn weight numbers 0–7 mean and how yarn weight affects your crochet hook, gauge, and finished project.

What Does Yarn Weight Mean?

Walk into the yarn aisle and you'll find lace, fingering, sport, DK, worsted, bulky—and sometimes several names that seem to describe the same thing.

Fortunately, yarn can also be grouped into numbered weight categories.

The standard categories run from:

0 – Lace

1 – Super Fine

2 – Fine

3 – Light

4 – Medium

5 – Bulky

6 – Super Bulky

7 – Jumbo

The higher the number, generally, the thicker the yarn.

What Yarn Weight Should I Use?

Your pattern should be your first guide.

Changing yarn weight can dramatically change the size, texture, drape, and yardage requirements of a crochet project.

A lightweight yarn can work beautifully for delicate projects, while a thicker yarn may be better suited to cozy blankets or quick projects.

But don't assume two yarns in the same weight category will behave exactly the same way.

Fiber content, construction, texture, and your own crochet tension all affect the finished fabric.

What Crochet Hook Goes With Each Yarn?

This is where I'd resist memorizing a giant hook-size chart.

Instead, check:

Your pattern
The yarn label
Your actual gauge

The recommended hook size is a starting point, not a rule.

If you're making something where finished size matters, make a gauge swatch.

Can I Substitute a Different Yarn?

Sometimes!

Before substituting, compare more than the yarn-weight number.

Look at the fiber content, yardage per skein, recommended gauge, texture, and how you want the finished project to behave.

A yarn substitution doesn't necessarily have to be identical—but you should understand what you're changing.

That's part of learning to make rather than simply following directions.

Keep the Basics Handy

I've created a FREE Crochet Quick Reference Guide with yarn weights, hook sizes, common crochet stitches, abbreviations, symbols, conversions, and other information you may want beside you while you work.

→ Download the FREE Crochet Quick Reference

And if you're ready to start a project, use the Made to Learn Crochet Project Planner to record your yarn, hook, gauge, pattern information, modifications, and progress.

Made to Learn.

Learn to Make.