What Hook Size Should Beginners Use? A Simple Sizing Guide

For most beginners working with medium-weight (worsted, #4) yarn, the best starting hook size is 4.5 mm to 5 mm (US size 7 to H-8). This size pairs naturally with the most common beginner yarn weight, is easy to hold, and produces stitches that are simple to see and count while you are learning.

Here is how to make sense of hook sizing so you never have to guess again.

Why Hook Size Matters

Hook size determines how large each stitch is. Too small a hook with thick yarn creates tight, hard-to-work stitches that strain your hands. Too large a hook with thin yarn creates loose, sloppy stitches that lose their shape. Matching your hook to your yarn weight is the single biggest factor in whether crochet feels easy or frustrating as a beginner.

Crochet Hook Sizes Explained

Hook sizes are labeled in millimetres (the actual diameter of the hook) and often also in a US letter or number system, which can be confusing since the two scales do not always line up cleanly. Here is a simplified reference for the sizes beginners use most:

• 3.5 mm (US E-4) - pairs with lighter (DK weight) yarn, good for finer detail work
• 4 mm (US G-6) - a versatile in-between size
• 4.5 mm (US 7) - a common amigurumi size, especially for tighter, more structured stitches
• 5 mm (US H-8) - the most common all-purpose beginner size for worsted weight yarn
• 5.5 mm (US I-9) and up - better suited for chunkier yarn and faster, looser projects

Why 4.5 mm to 5 mm Is the Beginner Sweet Spot

Worsted weight (medium, #4) yarn is the most widely available, most affordable, and easiest-to-see yarn weight for beginners, and it is designed to pair with hooks in the 4.5 mm to 5 mm range. Stitches at this size are large enough to see clearly (helpful when you are still learning to identify where to insert your hook) but small enough to create a neat, sturdy fabric, which matters for amigurumi where you want a stuffed shape to hold together well.

Does Hook Size Affect Amigurumi Specifically?

Yes, more than most other crochet projects. For stuffed characters, you generally want your stitches slightly tighter than the yarn label recommends, so that stuffing does not peek through the gaps between stitches. Many amigurumi patterns intentionally call for a hook a half size smaller than what the yarn label suggests, for exactly this reason.

What If My Stitches Look Too Loose or Too Tight?

• Stitches look loose or gaps show through: try a hook one size smaller.
• Stitches feel tight and hard to insert your hook into: try a hook one size larger, or check that you are not pulling your yarn too tight after each stitch.

Tension differs from person to person, so do not worry if you need a slightly different size than a pattern suggests. The goal is fabric that looks even and feels comfortable to work, not matching an exact number.

Skip the Guesswork With a Kit

The easiest way to avoid hook sizing confusion altogether is to start with a kit that already matches the hook to the yarn for you. Every Yon Crochet kit comes with the exact hook size paired to that character's yarn weight, tested and confirmed to produce a clean, sturdy amigurumi shape.

Browse Yon Crochet beginner kits and skip straight to crocheting instead of shopping for supplies.