Free Crochet Hook Size Chart

Crochet hook size chart and inventory

Use this handy crochet hook size chart when looking through your hook collection or when shopping to help you choose the correct crochet hook for your project!

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Where can I get this free crochet hook size chart

The crochet hook size chart is below in this post and is free for you to use! If you’d like to come back to it often, I suggest bookmarking this page so that you can easily find it again.

If you prefer a free, printable version of this crochet hook size chart, then you can get one by signing up for my email list with the form below. Within minutes after signing up, you’ll have an email with the free download.

The free download also includes blank crochet hook inventory pages where you can keep track of your own crochet hooks! For each hook you can list the size, brand, material it’s made of, and it’s location.

How is a crochet hook measured?

All crochet hooks have a metric measurement. This measurement is the diameter, or cross section of the hook’s shaft, the area between the hook and the thumb rest. The most precise way to measure this is with calipers. Since most of us don’t have this type of tool, you can get close by laying the shaft of the crochet hook over a metric ruler or measuring tape and seeing how much space it covers.

Various companies also offer crochet hook size gauges and tools like this one from WeCrochet to help you figure out the size of a crochet hook.

When you look at the chart below, you will see that the most precise way to describe the size of a crochet hook is by it’s metric measurement.

Notes about this crochet hook size chart

You will probably notice some odd things about this chart as you look at it, so let me explain some of the oddities of crochet hook sizing.

The smallest crochet hook sizes are typically used for cotton thread, and may also be used for lace weight yarn. These very small hooks are made of steel.

This set of crochet hooks can be described by their metric measurement and are also usually given a numeric identifier that is rather arbitrary. That numeric identifier isn’t standardized between all manufacturers. So what some manufacturers would call a size 4, others might call a size 0, or what some might call an 8, could also be called a 2 by others. So clear, right?

The sizing scheme for this smallest set of hooks is different than the sizing scheme for larger hooks. For these tiny hooks, the higher the numeric identifier, the smaller the hook. That’s the reverse of the sizing scheme for the larger set of hooks typically used for yarn. The tiny steel crochet hooks do not have a letter identifier as the larger hooks do.

You may also notice that there is some overlap between the steel hook sizes and the larger hook sizes used for yarn, so someone could be talking about a 2.25 mm crochet hook and call it a size 2 (from the steel crochet hook sizing) and someone else could refer to it as a B/1 (from the larger crochet hook sizing).

Within the larger crochet hook sizes that we use for yarn you will see a few metric measurements that don’t have a letter or numeric identifier. A few companies might make a hook that size, but not have given it any other identifier.

Those letters and numbers that have been assigned to hook sizes are not standardized worldwide, or even from one manufacturer to another within the same countries. So you will also sometimes see two or three different metric measurements with the same letter, or you may see multiple letters assigned to the same metric size.

I’ll repeat what I said above, the most precise way to describe the size of a crochet hook is by it’s metric measurement. If you want to be sure you are using the same hook as that called for in a pattern, go by the metric measurement.

Steel crochet hook size chart

I’ll start with a size chart for the tiny steel crochet hooks used for lace.

Metric Measurement	Numeric Identifier
0.60 mm	12
0.75 mm	14/10
0.85 mm	13
0.90 mm	14/8
0.95 mm	13
1 mm	12/6
1.05 mm	11
1.10 mm	11
1.15 mm	10
1.25 mm	9/4
1.30 mm	10
1.40 mm	9/8
1.50 mm	8/7/2
1.60 mm	6
1.65 mm	7
1.70 mm	5
1.75 mm	4/0
1.80 mm	6
1.90 mm	5
2 mm	4
2.10 mm	3
2.20 mm	2
2.25 mm	2
2.35 mm	1
2.55 mm	0
2.70 mm	00
2.75 mm	1
3.25 mm	0
3.50 mm	00

Crochet hook size chart for yarn size hooks

The size chart below if for the hook sizes commonly used for yarn. There is some overlap with the chart above, but the numeric and letter identifiers used are different in the two tables because the naming conventions between the two sets differs.

Metric Measurement	Letter Identifier	Numeric Identifier
2.25 mm	B	1
2.50 mm
2.75 mm	C	2
3.125 mm	D
3.25 mm	D	3
3.50 mm	E	4
3.75 mm	F	5
4 mm	G	6
4.25 mm	G
4.50 mm		7
5 mm	H	8
5.25 mm	I
5.50 mm	I	9
5.75 mm	J
6 mm	J	10
6.50 mm	K	10.5
7 mm
8 mm	L	11
9 mm	M/N	13
10 mm	N/P	15
11.50 mm	P	16
12 mm
15 mm	P/Q
15.75 mm	Q
16 mm	Q
19 mm	S
25 mm	T/U/X
30 mm	T/X

Remember, if you would like a free download of this crochet size chart, you can get that by signing up with the form below. Otherwise, please bookmark this page so that you can come back to it easily whenever needed.

Do you have any oddball hooks that don’t fit this information? Sometimes very old hooks or those from obscure manufacturers may not fit, but these charts try to take into account the vast majority of them.

I’d love to hear from you! Please share your thoughts in the comments here, tag me on Instagram, or join my Facebook group and be a part of the community there!

Happy crocheting!

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