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Crochet Hook Sizes & A Handy Conversion Chart

August 8, 2017 8 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, designer & creator specializing in yarn crafts like knitting, crochet, latch hook & macramé. 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
      • Gerri V Anderson

        September 12, 2023 at 5:07 pm

        Love your simple Conversion Chart. Easily read, understandable, just makes sense. Thank U, Heidi.

        Reply
        • Heidi

          September 13, 2023 at 1:25 pm

          You’re so welcome!

          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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How to convert a closet into WIPs storage with jus How to convert a closet into WIPs storage with just a few supplies ✂️
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When I was a librarian, we would use these hanging bags to circulate books with audiobook CDs. They came to mind when I wanted to develop a filing cabinet-like system for my differently-sized WIPs. To fit in my studio closet, a standard bedroom closet, they just needed custom hangers. 🤙🏻 
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HOW TO MAKE THE HANGERS
1. Carefully cut approx. a 9” (23 cm) length of flexible 3 mm aluminum wire.
2. Near the end of a large knitting needle or dowel, wrap the wire around it as you would a twist tie. 
3. Bend the other end into a hook shape, perpendicular to the circle shape you just created. 
4. Hang like a hanger in a closet, as shown. 
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#handsoccupied #handmadelife #knitting_inspiration #craftcloset #craftroom #craftroomorganization #craftroomstorage #craftroomdecor #crocheter #latchhook #knittersofinstagram #wip #wips #hangingstorage
It’s time for the monthly review and giveaway! T It’s time for the monthly review and giveaway! This go around, get to know two new sister yarns from @manosyarnsusa, Marla and Sami, and enter to win a skein of each to try for yourself. 
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What makes these yarns sisters is that, while dyed differently, they’re the same weight and come in intentionally coordinating color palettes. For my review, I opted for a sky-inspired combo of Sami in Natural and Marla in Nube. 🌧️ 
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Check out the full review & enter the giveaway at the link in my bio. 
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#handsoccupied #yarnreview #manosdeluruguay #knitting_inspire #crochet #yarngiveaway #knitters #yarn #crochetersofinstagram
If only knitting a whole project took 39 seconds… 😮‍💨 
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In this video, you can see how the Intarsia Flower Pillow pattern knits up - two flat panels, one with intarsia, both are blocked, and then they’re seamed. Find the pattern on @hi.ravelry & my website, just search Intarsia Flower Pillow. 🌸 
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P.S. I’m really smiling in this video while seaming the pillow, so I guess I’m proving last week’s claim that I truly enjoy that sometimes-dreaded task. 😆🫣
In knitting, a Left Lifted Increase (LLI) lets you In knitting, a Left Lifted Increase (LLI) lets you add a stitch in between two columns of stitches that leans to the left. Similar to an M1L, LLIs allow you to increase nearly invisibly.
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To learn more about lifted increases, including when to use them and how they differ from Make 1s, head to the 🔗 in my profle. 
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Have you ever used lifted increases? I used M1’s almost exclusively for a long time when I needed to inc between stitches, but when I designed the Intarsia Flower Pillow pattern, I needed something that would allow me to increase a lot near my cast on, and M1’s resulted in edge curling. The more you know! 🌈 
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Yarn: @lionbrandyarn Wool Ease from my Stash / Neddles: @boyeyarncrafts - Just remembered these are the needles I learned to knit on at age 8. 😂
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Lessons learned: 1️⃣ Trying to knit around 2 toddlers, 2 cats & 2 large dogs is pretty hard. 2️⃣ I learned during water color time that pink and black make “colorful black.” 🩷🖤 3️⃣ Toddlers do NOT care about your rainbow sorting of their toys. 4️⃣ Toddlers are very good at finding mischief in a very short amount of time, what a surprise. 😂
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