# [Compare crochet hook sizes](https://threadcabin.com/explore/195/compare-crochet-hook-sizes)

> Compare the diameter in millimeters; numbered steel hooks and lettered hooks belong to different sizing systems.

- Canonical page: https://threadcabin.com/explore/195/compare-crochet-hook-sizes
- Language: en
- Published: 2026-09-25T17:26:33.8217730+00:00
- Updated: 2026-09-25T17:26:38.9166979+00:00
- Craft: Crochet
- Primary image: [Illustration: Three crochet hooks with different shaft diameters beside appropriately sized loops of cream yarn; one working hook carries a relaxed loop.](https://threadcabin.com/images/explore/focused/crochet-hook.jpg)

Compare the diameter in millimeters; numbered steel hooks and lettered hooks belong to different sizing systems.

## Before you start

Keep the exact labels and make two comparable samples. Change one material property at a time and use the intended finishing method on both.

## Try this example

Two hooks marked 2 can have different diameters. Read their manufacturer tables, then crochet ten stitches with each and compare the relaxed width.

## Check your result

- Compare the dry samples for recovery, surface, drape and the property needed for the project. Record observations separately from label claims.
- A fiber name or category cannot predict every finished fabric. Construction, treatment, gauge and use all affect the result.

## Sources

- [www.craftyarncouncil.com: hooks and needles](https://www.craftyarncouncil.com/standards/hooks-and-needles)
- [cottonworks.com: yarn spinning](https://cottonworks.com/learning-hub/yarn-manufacturing/yarn-spinning/)

[Browse editable craft templates](/crafts?craft=crochet)

[Report a correction](/corrections).

## Sources and provenance

- [Yarn label anatomy: turn symbols and numbers into decisions](https://threadcabin.com/explore/15/yarn-label-anatomy-turn-symbols-and-numbers-into-decisions)
- [Crochet hook anatomy: head, throat, shaft, and grip](https://threadcabin.com/explore/3/crochet-hook-anatomy-head-throat-shaft-and-grip)
- [Yarn twist and ply: structure before stitch](https://threadcabin.com/explore/7/yarn-twist-and-ply-structure-before-stitch)