Crafts & Sewing
Knitting needle conversion
Metric (mm), US and UK needle sizes at a glance.
- Instant
- Free
- Private (processed locally)
- No sign-up
Convert a size
Pick the metric size (mm): the tool shows the matching US and UK sizes.
Some equivalents
| mm | US | UK |
|---|---|---|
| 3.25 | 3 | 10 |
| 4.0 | 6 | 8 |
| 5.0 | 8 | 6 |
| 6.0 | 10 | 4 |
Indicative table. 100% local.
Frequently asked questions
Are the systems aligned?
Not perfectly: some sizes have no exact equivalent (shown as “—”).
Why is metric most reliable?
The millimetre is the real diameter; US/UK numbers are conventions without a regular step.
What about gauge?
Always knit a swatch: needle size is adjusted to your tension and yarn.