Crochet Hook Size Converter
Convert crochet hook sizes between US, UK, and metric (mm) systems instantly.
Hook Size Converter
Enter a size in any field — the others update instantly.
Equivalents
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US
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UK
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mm
No exact match found. Try the nearest mm value or check the chart below.
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Full Size Chart
Standard aluminum/plastic hook sizes. Click any row to populate the converter above.
| US Size | UK Size | Metric (mm) | Common Use |
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Summary
Convert crochet hook sizes between US, UK, and metric (mm) systems instantly.
How it works
- Type or select a hook size in the US, UK, or mm field.
- The tool looks up the size in a built-in reference table.
- All three equivalent values are displayed instantly.
- The full chart below shows every standard size for quick browsing.
Use cases
- Match a US pattern to the metric hooks in your collection.
- Decode UK hook sizes listed in vintage crochet patterns.
- Find the closest standard size when buying hooks online.
- Cross-reference size charts when shopping international brands.
- Double-check hook size before starting a gauge swatch.
Frequently Asked Questions
Last updated: 2026-07-01 ·
Reviewed by Nham Vu