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Colorful knitting, crochet, latch hook and macrame from craft book author & designer Heidi Gustad.

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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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When it’s August & the crew has the day off, the When it’s August & the crew has the day off, the only thing to do is a Knitflix marathon! I hadn’t seen the latest season of Stranger Things and had a TON of knitting to do, so we decided why not make a day of it? For non knitters, this is a pretty accurate depiction of what a dream day looks like for maker types. (Plus or minus a cranky but cute house pet.) 
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What does your dream knitting day look like? 
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Just making this for fun & to see how it feels to distill a yarn day into a short video like this. Big thank you to Jamie & Mariah for being my friends, even though they said “it’s okay if you don’t tag me in this.” 🤣🤣🤣🤣🤣 
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Are you looking for some late summer reading picks Are you looking for some late summer reading picks? Here are 3 fresh titles for makers of all ages - full reviews are on my bl0g, along with a giveaway for a copy of Knitstrips! The 🔗 is where you’d think. 😉
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To Make by Danielle Davis (@writesinla) / Knitstrips by Alice Ormsbee Beltran & Karen Kim Mar (@ik_knitstrips) / This Long Tread by Jen Hewett (@jenhewett) 
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New on the blog today! This former Librarian revie New on the blog today! This former Librarian reviews three making-related books for kids, teens & adults. And there’s a copy of one up for giveaway too! 📚 
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To Make by Danielle Davis (@writesinla) with pictures by Mags DeRoma (@magsderoma) / Knitstrips (@ik_knitstrips) by Alice Ormsbee Beltran & Karen Kim Mar / This Long Thread by Jen Hewett (@jenhewett) 
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I’ll share preview page-through videos for these this week too, but for now the written reviews are at the top of handsoccupied dot com along with my search bar if you can’t find ‘em. All giveaway details are listed in the review post. 🤙🏻 
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(^ I heard a rumor that if I tell you to exit this app, no one will see this post, so plz forgive the song & dance just in case it matters. 🙈)
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I think about the wrong side of my intarsia knitti I think about the wrong side of my intarsia knitting kind of like some embroiderers do: I get (probably too) excited when the back’s neat and tidy. Are you this way? Is it just me? 
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Pictured is the wrong side of a large primary color intarsia swatch I knit for an upcoming design in @brooklyntweed Arbor. When I pulled it from my studio, I thanked my former self for talking the time to knit, weave in ends, & block a clean swatch already. As critical as they are, I’m excited to not have to make one today. I’ll advocate for swatching all day long, but I won’t pretend it’s like the funnest step in the process! 😆🧶
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