PixelMaster

Crochet Hook Size Chart — Metric and US Sizes

Choose a tool family first. Metric millimeters are authoritative; multiple US-label matches require an explicit choice, not a guessed conversion.

Your project settings

Your result

Choose a tool family first. Metric millimeters are authoritative; multiple US-label matches require an explicit choice, not a guessed conversion.

Regular hook
5 mm · US H-8
Pattern stitches
66
Size with your swatch
33.0 cm

Labels vary by manufacturer. Use the selected family and package millimeters; only a new measured swatch can verify a substitution.

Separate size charts and ambiguous labels

Only the selected tool family is searched. No equivalence is inferred across regular hooks, steel hooks and knitting needles. Multiple metric values may share a US label; choose explicitly.

28 entries in this independent chart; 28 match.

MetricUS labelExplicit choice
2.25 mmB-1
2.5 mmNo common label
2.75 mmC-2
3.125 mmD
3.25 mmD-3
3.5 mmE-4
3.75 mmF-5
4 mmG-6
4.25 mmG
4.5 mm7
5 mmH-8
5.25 mmI
5.5 mmI-9
5.75 mmJ
6 mmJ-10
6.5 mmK-10 1/2
7 mmNo common label
8 mmL-11
9 mmM/N-13
10 mmN/P-15
11.5 mmP-16
12 mmNo common label
15 mmP/Q
15.75 mmQ
16 mmQ
19 mmS
25 mmT/U/X
30 mmT/X

CYC reference checked2026-10-14. Package millimeters and a new swatch take precedence; historical UK equivalence is not inferred.

Craft Yarn Council · regular

Hook reference: Craft Yarn Council Standards. Traditional UK labels vary; the metric shaft diameter is the deciding measurement.

Crochet Hook Size Chart — Settings and outputs

  • Project constraints

    Search independent CYC tables for regular hooks, steel hooks and knitting needles.

  • Live review

    Resolve multiple US-label matches explicitly using package millimeters.

  • Usable output

    Compare your measured gauge with the pattern gauge before replacing a hook.

Conversion steps

  1. Set your actual constraints

    Choose a tool family first. Metric millimeters are authoritative; multiple US-label matches require an explicit choice, not a guessed conversion.

  2. Check the calculated result

    Search independent CYC tables for regular hooks, steel hooks and knitting needles.

  3. Keep the output and your settings

    Compare your measured gauge with the pattern gauge before replacing a hook.

Questions about this tool

Can I convert steel hook numbers here?
Yes, in its own reviewed reference table. Switching families replaces the metric options; ambiguous labels show all candidates. No cross-family or historical UK equivalence is inferred.
Is a larger hook a guaranteed size correction?
No. Measure a new swatch. The calculator compares actual gauge; it does not infer gauge from the hook number.
tool: crochet-hook-sizes · craftpixelmaster toolchain