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Crochet Hook Sizes & A Handy Conversion Chart

August 8, 2017 6 Comments

Eliminate hook size confusion with this handy conversion chart, showing you what US & mm crochet hook sizes are equal to each other!
There was such a good response to the knitting needle size conversion chart that it seemed like a crochet chart was in order too! While crochet hooks use letters instead of numbers to differentiate sizes in the US, they use good old (and arguably less confusing) millimeters elsewhere to tell sizes apart. Since it’s hard to remember that an H hook is equivalent to 5 mm right off the top of your head, the chart below is a good one to bookmark or pin for future reference.

Eliminate hook size confusion with this handy conversion chart, showing you what US & mm crochet hook sizes are equal to each other!

Crochet Hook Conversion Chart

a.k.a. What size is my crochet hook? 

Eliminate hook size confusion with this handy conversion chart, showing you what US & mm crochet hook sizes are equal to each other!
Important notes

  • All listed hook sizes are based on the Craft Yarn Council’s standards, an organization worth bookmarking for all needlearts lovers! It’s important to note that there can be some inconsistency among crochet hook brands, which I noted with my knitting needles conversion chart too. Because of issues like this, I recommend always double checking your hook size using a measuring tool that includes both US and mm sizes. When designing crochet projects, I also recommend always deferring to mm sizing because it’s an objective standard of measurement. You can never be too careful with gauge!
  • For consistency’s sake, this post was intentionally formatted the same way as the knitting needle version of this post. :)

Eliminate hook size confusion with this handy conversion chart, showing you what US & mm crochet hook sizes are equal to each other!
Eliminate hook size confusion with this handy conversion chart, showing you what US & mm crochet hook sizes are equal to each other!

Filed Under: Crochet Tagged With: crochet hook conversion chart, crochet hook sizes, crochet hooks, hook sizes, us to mm

About Heidi

Heidi Gustad is a craft book author & content creator in love with primary colors & vintage vibes. She specializes in knitting, crochet, latch hook and macramé, and her first book, Latch Hook: 12 Projects for the Modern Maker, is out now!

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Comments

  1. Elaine

    April 19, 2019 at 5:35 pm

    I just started to teach myself how to crochet and im still learning via YouTube… Im doing this because one of my grandchild wanted a cloak so LSS I started to try and teach myself,

    Reply
  2. linda thurlow

    January 20, 2021 at 5:44 pm

    I have a pattern that calls for 12 mm crochet hook. What letter corresponds to this size?

    Reply
    • Heidi

      January 25, 2021 at 4:07 pm

      No letter name is assigned to 12mm hooks. It’s actually why across needlecrafts (knit, crochet, latch hook, etc.), I personally prefer referring to metric measurements rather than the assigned letters and numbers. Gotta love how complicated measuring can be. 😅

      Reply
  3. Joanne Rivard

    May 22, 2022 at 5:28 pm

    I am making a small afghan 24″ x 36″ for the hospital patients. I am using a size K hook and need to know how many chains I need for the 24 inches then I will crochet foe 36″ long
    Can you help? Thanks!

    Reply
    • Heidi

      May 23, 2022 at 1:07 pm

      If you have an idea of your gauge*, you can multiply the number of stitches per inch you’re working by the 24″ width. So if you’re crocheting at about 4 stitches per inch, 4 stitches per inch x 24 inches = 96 chains to begin with. Good luck!

      *how many stitches per inch you’re crocheting given your tension, yarn & hook

      Reply

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Heidi Gustad from Hands Occupied / Craft Book Author and Knitting, Crochet, Latch Hook and Macrame Designer

Hi! I’m Heidi (she/her/hers), a craft book author & pattern designer specializing in knitting, crochet, latch hook & macrame. Really anything with yarn! ❤️  My work combines vintage and modern design elements, featuring bold colors and graphic motifs.

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handsoccupied

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Sneaking in a few stitches in the shade. 😎 Sneaking in a few stitches in the shade. 😎
Another morning of filming! One of the knitting vi Another morning of filming! One of the knitting videos I’d like to release soon is a big overview of how to swatch and why - if you have any questions or favorite tips, let me know. 
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To be honest, I want to be able to link to this video as a resource when I get angry gauge questions, so please don’t hesitate to share your best tips. Together, we can tame the knitting Karens. 😆
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#stopswatchandblockit #handsoccupied #knitting #knittersofinstagram
A big issue I've had in the last year is putting t A big issue I've had in the last year is putting together new design work but not doing any independent releases of them. Chalk it up to anxiety, burn out, or whatever but here we are. 
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Last week I turned 35, so in honor of that here’s 3 things: 
❤️ a picture of me at my most stylish 
💛 a little glimpse at some of the design things I've recently been working on
💙a promise that I will be releasing some of the pictured designs this year. Getting back in the swing of things after taking it easy is hard 😆 - wish me luck!
Like a riding a bike! June guarded the neighborhoo Like a riding a bike! June guarded the neighborhood while I shot a new crochet tutorial today. With any luck, editing will go smoothly & I’ll be posting new videos to YouTube regularly soon! Got any requests for tutorial topics? 
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#handsoccupied #crochet #studiodog #crochettutorial
This yoke deserved a mid-blocking closeup, don’t This yoke deserved a mid-blocking closeup, don’t you think? ❤️💛💙
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Pattern: modified #soldotnacrop sweater / yarn: various from my stash
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