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Knitting needle sizes and conversion chart

Find out how to measure your needles and convert between UK, US and metric sizes with our guide to knitting needle sizes.

Knitting needle sizes
Knitting needle sizes can be confusing, but don’t worry – we’re here to help you make sense of them. Countries label their knitting needles in different ways, so the number on your needle may mean a different thing depending on where in the world you live. In this article we’ll explain more about these numbers, show you how to measure knitting needle sizes, and provide a knitting needle conversion chart for UK, metric and US sizes. In our guide you’ll find:

What do knitting needle sizes mean?

The size on a knitting needle tells you its diameter. This measurement is important because the needles you choose can have a huge impact on your finished project. If you choose needles that are too big for your yarn, you’ll end up with large, loopy stitches, and if you choose needles that are too small your stitches could be tight and hard to knit. Take a look at our yarn weight conversion chart and beginner’s guide for more on which needles are best for which yarns.
The knitting needle size may be written in a number of different ways, depending on where it was made. Many needles are labelled using metric units, but the UK and US also have their own numbering systems and, confusingly, they work in opposite directions. In the UK, the scale runs from 14 (the smallest size) to 000 (the largest size), while in the US it runs from 0 (the smallest size) to 50 (the largest size). And for some common metric needle sizes there’s no UK or US equivalent at all! To get your head around all of this, you need a knitting needle conversion chart, and we have one for you below.

How to measure knitting needle size

Most new needles have the size printed somewhere on the end or side of the needle, but what about those hand-me-down or charity shop pins where the number was rubbed off years ago, if it ever existed in the first place? To determine the size of these mystery needles, you need a knitting needle gauge.

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These handy tools are an essential part of any knitting starter kit, and many also offer other functions such as enabling you to measure knitting tension squares or even cut your yarn. They are made from sturdy wood, plastic or sometimes metal, and feature a collection of holes, from small to large, each with a number next to it. All you need to do is push the point of your mystery needle through each hole in turn, until you find the one where it fits perfectly. Then read off the number next to the hole and this will tell you the knitting needle size – easy!

Knitting needle gauge: 3 to buy

1

Pony Knitting Gauge

Knitting needle gauge Pony

We love how many tools Pony have crammed into this clever needle gauge! As well as measuring needle sizes from 2-10mm it also has a ruler, and a blade for cutting yarn. There’s a separate version for measuring larger needle sizes too.

Buy it from Deramores’ UK store or US store.
2

Knit Pro Needle View Sizer

Knitting needle gauge KnitPro

This little gadget measures needles from 2-12mm, and also comes with a ruler in both centimetres and inches. There’s a clear window in the ruler that enables you to measure your knitting gauge – handy when swatching for a new project.

Buy it from Amazon.
3

Cat Needle Gauge

Knitting needle gauge Etsy

A must for cat lovers, this cute gauge from Under the Olive Tree Knits measures needles from 2mm to 12mm in size. It’s made from plywood and varnished for a natural finish. Stash it in your project bag to measure needles on the go.

Buy it from Etsy.

Knitting needle conversion chart

UK needle size
Metric needle size
US needle size
14
2mm
0
13
2.25mm
1
2.5mm
12
2.75mm
2
11
3mm
10
3.25mm
3
3.5mm
4
9
3.75mm
5
8
4mm
6
7
4.5mm
7
6
5mm
8
5
5.5mm
9
4
6mm
10
3
6.5mm
10½
2
7mm
1
7.5mm
0
8mm
11
00
9mm
13
000
10mm
15
12mm
17
15mm
19
20mm
36
25mm
50

These are the most common needle sizes you’ll see, but if you’re in doubt about your needle size always check it using a needle gauge.

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Knitting needle conversion chart printable

Here’s a handy version of the conversion chart for you to save and print:

Knitting needle sizes

More knitting tips

Take a look at our how to knit section for more knitting advice and inspiration. Find out how to choose the right knitting needles for your project and learn all about knitting tension squares to get accurate results. Plus see our knitting abbreviations for all those hard-to-remember knitting terms, and how to cast on knitting for all you need to know about this crucial technique!

Complete guide to knitting abbreviations: how to read knitting patterns