A 5mm crochet hook is a US H-8, and UK size 6. It’s the size I recommend most often to someone buying their first hook, since it matches the most common beginner yarn weight and pattern instructions almost universally.
What is a 5mm crochet hook used for?
This size is the standard match for worsted weight yarn, which is the most widely available and most commonly used weight for beginner patterns, blankets, and amigurumi. Nearly every “learn to crochet” pattern I’ve seen calls for either a 5mm or a 5.5mm hook.
- Yarn weight: worsted (medium, weight category 4).
- Common projects: blankets, hats, amigurumi, beginner garments.
How 5mm compares to nearby sizes
A 4.5mm hook produces a slightly denser fabric in the same yarn, useful for stuffed toys that need to hold their shape. A 5.5mm hook goes the other direction, giving a softer drape better suited to garments and blankets than tightly stuffed items.
Frequently asked questions
What letter is a 5mm crochet hook?
A 5mm hook is a US H-8. In UK and Canadian sizing, the same hook is a 6.
Is a 5mm crochet hook good for beginners?
Yes, it’s the size I recommend most often for a first hook, since it matches worsted weight yarn, the most common weight for beginner patterns. It was my own first hook too, and I still use it weekly.
Is a crochet needle the same as a crochet hook?
Yes, “crochet needle” is a common but technically incorrect synonym for “crochet hook,” and a 5mm of either term means the same tool.
See the full hook size chart
Compare 5mm against every other mm, US, and UK size in one table.