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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 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 (she/her) is a craft book author & designer specializing in yarn crafts. Her work combines vintage and modern design elements, prioritizing color and graphic motifs. 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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    December 1, 2020 at 12:08 am

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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), and I’ve been helping yarn crafters untangle various techniques on the internet since 2010. I got my start here, as a blogger, and since then I’ve shared more than a few tutorials here and on YouTube as I’ve grown as a pattern designer. 🧶 

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Heidi Gustad 🧶 knitting & yarn crafts

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Knitting & yarn crafts designer 🧶
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Stay up-to-date 💌 & shop new patterns ⤵️

POV: Showing you how my new Bevelled Tank pattern POV: Showing you how my new Bevelled Tank pattern fits with no ease vs. 4” of positive ease. There’s a bit more length to the cotton (brighter color) sample, but both are cropped and feature shoulder seams designed to sit an inch back onto the shoulder instead of on top, giving it a little swing. Length is easily adjustable for folks looking for less of a crop. 
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Pattern: Bevelled Tank by @handsoccupied for @pompommag x @hobbii_yarn summer 2024. Available for free from Hobbii at the 🔗 in my profile.
Yarn pictured: @kelbournewoolens Skipper and Camper. 
Dress form is adjusted to a 36” chest and ~5’3”ish in height. 
Human has a 40” chest and is 5’5”.
Both skirts are vintage.
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#pompomxhobbiisummer2024 #handsoccupied #intarsia #handmade #knitting #colorwork
Let’s talk about fit and ease! . During the Beve Let’s talk about fit and ease!
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During the Bevelled Tank design process for @pompommag, I knit 2 samples using 2 different @KelbourneWoolens yarns. One was in Skipper (100% cotton, second photo) and the other was in Camper (100% 2 ply wool). The Skipper sample was knit for a 36” bust, which measures in at 40” with 4” of positive ease. And I knit the Camper Sample for my 40” bust with a 44” finished measurement. (BTW, I’m 5’5” for folks that find that measurement helpful in visualizing fit.)
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Based on the size chart for the Bevelled Tank, that means I knit one size 3 sample and one size 4. As designed, I conveniently fit a size 4 as intended with 4” of positive ease. When I wear the 3, there is no ease at all because the garment and my body are both 40” in size. Comparing the 2 garments, you can see how the fiber content (cotton vs. wool) and fit (no ease vs. 4” of positive ease) makes a difference in the look and feel of the finished garment. 
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These samples are a great way to compare what ease looks like on different bodies. While I can fit both a size 3 and 4, the garment with no ease feels more like pajamas or a bralette when I wear it. On the other hand, when I wear the one with 4” of positive ease, I feel comfortable enough to wear it to work, even as a crop top. Plus, it leaves me with enough room to layer it with a nice button down if I’m not feeling the cropped look one day. 
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I’m curious - how would you style this tank? Would you modify it with a few stockinette rows for added length? I’m so curious now that this pattern is finally out in the world. :) 
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#pompomxhobbiisummer2024 #bevelledtank #handsoccupied #knitting #intarisa #handmade #kelbournewoolens #croppedsweater #summerknits
After a 6 month hiatus, I am happy to say I’m ba After a 6 month hiatus, I am happy to say I’m back with a brand new pattern in 9 sizes, and it’s FREE as part of @pompommag x @hobbii_yarn’s summer design collection! (Link is in my bio.)
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In my December newsletter, I announced that I was soliciting test knitters for a pattern that had originally been selected for the summer ’24 issue of Pom Pom Quarterly magazine. However, the magazine ceased publication after its spring ’24 issue, leaving in-progress designs unpublished. (It happens.) As a result, I’d begun the long process of editing, testing, and photographing the pattern for independent release through the Hands Occupied pattern shop and Ravelry.
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Before I was done with that process, Pom Pom Quarterly’s former editors reached out with an exciting proposal for the pattern. Post-magazine, they’ve begun to partner with yarn companies to produce high quality pattern collections. They wanted to include designs from the would-be current issue of Pom Pom Quarterly in a new collection for Hobbii yarn, including my Bevelled Tank. I worked with the same technical editors I would have for the magazine on this one, and as you can see from the photos, Pom Pom’s team did an amazing job of styling the garment to the beautiful standards they’re known for.
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You can learn more about the pattern on my blog and get the free pattern from Hobbii yarn - links to both in my profile. I’ll post sizing info in the comments for quick reference too. 🧶
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#pompomxhobbiisummer2024 #knitting #intarsia #sponsored #colorworkknitting 
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Photos: @dianascarrunz 
Model: @angel.jade_
Here’s a nice throwback for you: my take on a vi Here’s a nice throwback for you: my take on a vintage knitting pattern from 1938 called the Fernlace Pullover. A pattern so nice, I knit it twice.
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Yellow version 💛: knit with Despondent Dyes’ Vintage Vixen Sport after attending a @squidneyknits vintage knitting retreat in 2019 & learning *so much*. Paired with a self-drafted circle skirt pattern. 
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Blue version 💙: knit with @eweeweyarns Ewe So Sporty in Sky Blue. Paired with the 1940s Boardwalk Duet sewing pattern from @decades_of_style 
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Head to my stories for 🔗🔗 to the handmade wardrobe blog posts I wrote about each take on the Fernlace Pullover, working with a vintage pattern, where to find vintage patterns (including the one I used), & some thoughts on sizing. 
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Image descriptions available in alt text. 
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#handsoccupied #handmadewardrobe #fernlacepullover #vintageknitting #vintageknittingpatterns #knitting_inspiration
Frogging is a word in the knitting world that mean Frogging is a word in the knitting world that means to rip out your knitting. It’s called frogging because frogs say “ribbit,” and when you’re tearing out your knitting, you will “rip it” out, and that sounds like ribbit. No really. 🐸 Did you know this fun fact? 
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P.S. I did like this design concept, but to make the pattern more knitter friendly as well as more wearable, I am making some tweaks to the construction. Excited to share when it’s ready! 🥰🧶
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Yarn: @blueskyfibers Woolstok North in Morning Frost & Highland Fleece 
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#handsoccupied #knitting #frogging #blueskyfibers #knittersofinstagram #blueskymakers #knittingvocabulary #bsfmakers #knitdesign
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