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Knitting Needle Converter

Convert between US, metric (mm), and UK knitting needle sizes instantly. Includes a complete reference table with recommended yarn weights.

Convert From

US Size

Complete Needle Size Reference

US Size	Metric (mm)	UK / Canadian	Recommended Yarn
0	2	14	Lace / Fingering
1	2.25	13	Lace / Fingering
2	2.75	12	Fingering / Sport
3	3.25	11	Sport / DK
4	3.5	10	Sport / DK
5	3.75	9	DK / Worsted
6	4	8	Worsted
7	4.5	7	Worsted / Aran
8	5	6	Worsted / Bulky
9	5.5	5	Bulky
10	6	4	Bulky
10.5	6.5	3	Bulky
11	8	2	Super Bulky
13	9	1	Super Bulky
15	10	0	Super Bulky / Jumbo
17	12	00	Jumbo
19	15	000	Jumbo
35	19	-	Jumbo
50	25	-	Jumbo

How to Use This Converter

Select which measurement system you are converting from (US, Metric, or UK).
Enter the needle size in that system.
Click Convert to see the equivalent sizes in all three systems.
The recommended yarn weight for that needle size is also displayed.

Note: US needle sizes go up in half sizes between 0 and 4 (0, 1, 1.5, 2, 2.5, 3, 3.5, 4). Metric sizes are the most precise and universally used in patterns outside North America and the UK.

All conversions are performed locally in your browser. No data is sent to any server. Size charts follow standard Craft Yarn Council guidelines.

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