What hook size should I use with my yarn?

Match the hook to the yarn weight. As a guide, lace uses 1.5 to 2.25 mm, fingering uses 2.25 to 3.5 mm, sport uses 3.5 to 4.5 mm, DK uses 4.5 to 5.5 mm, worsted uses 5.5 to 6.5 mm, and bulky uses 6.5 to 9 mm. The yarn label gives a suggested size to start from.

What hook goes with worsted weight yarn?

Worsted weight yarn, number 4, pairs with a hook around 5.5 mm to 6.5 mm for standard fabric, though many crocheters use a 5.0 mm hook for a slightly firmer result. Check the yarn label and adjust to match your pattern's gauge.

Where do I find the recommended hook size?

The recommended hook size is printed on the yarn label, usually shown as a small hook symbol with a millimeter size beside it. This is the manufacturer's suggested starting point for that yarn.

Can I use a different hook size than the label says?

Yes. The label size is a starting suggestion. You may go up a size for looser, drapier fabric or down a size for firmer, denser fabric, and you should adjust to match a pattern's gauge.

What happens if my hook is too small or too big for the yarn?

A hook that is too small makes stiff, dense, cramped fabric, while a hook that is too big makes loose, floppy fabric with holes. Adjusting the hook size until the fabric feels right for your project fixes both.

How does hook size affect gauge?

A bigger hook makes bigger stitches, so fewer fit in a given measurement, and the project comes out larger and looser. A smaller hook makes smaller stitches and a denser, smaller result. Changing hook size is the main way to match a pattern's gauge.

Crochet Hooks

What Crochet Hook Size for Your Yarn? A Simple Pairing Guide

Published July 5, 2026

Yarn and hook are a team, and pairing them well is one of the most useful skills in crochet. Use the right hook for your yarn and the fabric comes out just as it should, not too stiff and not too loose. Use the wrong one and even a lovely yarn can turn into disappointing fabric. The good news is that matching them is straightforward once you know the basic pairings and how to read the yarn label. This guide shows you how, and it works closely with crochet hook sizes and the crochet yarn guide.

Why the Pairing Matters

The hook and yarn work together to create fabric, and the size relationship between them decides how that fabric turns out. A hook that suits the yarn gives stitches room to form neatly, producing fabric with the right balance of firmness and drape. If the hook is too small for the yarn, the stitches are cramped and the fabric is stiff and hard. If it is too big, the stitches are loose and the fabric is floppy and full of gaps. Getting the pairing right is the foundation of good fabric, whatever you are making.

Start With the Yarn Label

The easiest way to find the right hook is to read the yarn label, which prints a suggested hook size for that yarn, usually shown as a small hook symbol with a millimeter number. This suggestion is a reliable starting point chosen by the maker to suit the yarn's weight. It will not always be the final answer, since your pattern or your own tension may call for an adjustment, but it tells you the right ballpark immediately. Learning to read the whole label is a handy skill, covered in the yarn guide's how to read a yarn label.

Pairing by Yarn Weight

If you do not have the label, you can pair by yarn weight, since each weight has a hook range that suits it. Lace weight uses roughly 1.5 to 2.25 mm, fingering uses 2.25 to 3.5 mm, sport uses 3.5 to 4.5 mm, and DK uses 4.5 to 5.5 mm. Worsted, the popular medium weight, uses around 5.5 to 6.5 mm, while bulky uses 6.5 to 9 mm and super bulky and jumbo use even larger hooks. Knowing the weight tells you the hook, which is why understanding yarn weights is so useful.

Adjusting Up or Down

The label size is a starting point, not a strict rule, and you can adjust it to change your fabric. Going up a hook size makes bigger, looser stitches, which gives softer drape and an airier feel, nice for shawls and light garments. Going down a size makes smaller, tighter stitches and a firmer, denser fabric, which is ideal for amigurumi and bags that need to hold their shape and hide stuffing. Think about the fabric you want, then nudge the hook size to get there. A quick swatch shows you the result before you commit.

Matching a Pattern's Gauge

When you follow a pattern, especially for something that needs to fit, the hook size is really decided by gauge, which is how many stitches and rows fit in a set measurement. The pattern states its gauge, and your job is to match it. Make a gauge swatch with the suggested hook, then compare. If you have too many stitches per inch, your stitches are too small, so go up a hook size. If too few, go down. Adjust until your gauge matches, and the finished project will come out the right size, a process explained in the crochet basics.

When Fabric Feels Wrong

Sometimes the numbers are fine but the fabric just does not feel right, and your hands can tell you a lot. If the fabric is stiff and hard to hook into, your hook is probably too small for the yarn, so try going up a size. If it is loose, floppy, and full of holes, the hook is likely too big, so go down. Trust the feel of the fabric alongside the label and the gauge. The right pairing produces fabric that feels pleasant and suits the project, which is ultimately what you are after.

Pairing With Confidence

Matching hook to yarn comes down to a simple routine: start with the label's suggested size, adjust up or down for the fabric you want, and swatch to match the pattern's gauge. Keep the weight to hook ranges in mind for when you have no label, and let the feel of the fabric guide you. With a little practice, this becomes automatic. To go deeper, see crochet hook sizes and how to choose a crochet hook, or explore the yarn side in the crochet yarn guide.