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Super Sock Calculator

An online calculator for toe-up (magic cast-on), short-row heels, two at a time socks. You can read more about these types of socks in this post: 4 tips for easy sock knitting. 

The pattern in on too! The hashtag for this pattern is #SuperSockCalculator.

I have pre-filled the form with the gauge (26) I use for the Koigu Painter’s Palette Premium Merino (KPPPM) and 3mm (US 2.5) needles used in the videos. Please change the measurements and gauge to fit your own project. If you have any trouble understanding how to use the calculator, please view the first video below

the pdf version

If you want a paper copy of the pattern, then print the pdf version and add the numbers A, B and C, below, in their respective places. 

numbers for the pdf version

the online version – with videos


Go to the Super Sock Calculator and input your measurements or use the predefined measurements in the dropdown box.

Casting on at the toe:

You begin Judy’s magic cast-on with ? stitches on each needle and continue to work increases till you reach ? stitches on each needle.


Turning the heel:

Once you have knit ? from the tip of the toes it is time to turn the heel. Here I use shadow wrap short-rows, but you can use any other type of short-rows too. You work the heel on half of the stitches only (the ones on one needle). Knit the short-rows till you have ? stitches left in the center. They you pick up the stitches again till you reach the full ? stitches.

For speed I usually turn each heel separately and then pick up the remaining half of the stitches as it fits into the magic-loop method.

Finishing off:

Now continue upwards till you reach your desired length, run out of yarn or just get fed up. It is a good idea to begin ribbing at least 2.5cm (1 inch) from the top. Cast-off using your favourite elastic cast-off.


Super Sock Calculator by Eddie's Room,

Tech notice: You will find various versions of these calculations around the internet and in different books and magasines. But here I have attempted to build a little calculator, specifically for toe-up, short-row heel socks, into which you can put your own measurements and gauge or choose one of the predefined sock sizes based on the Craft Yarn Council’s Foot Size Chart. *For those of a technical persuasion, it is actually an AJAX based WordPress plugin, which I hope to adapt to other knitting patterns.* I am also making a list with other knitted sock calculators over here

I am going to add some video’s to youtube on each tips as and when I get them done. So keep an eye on the blog or subscribe to the youtube channel to hear all about this. 

If you want to use this calculator as a designer you are more than welcome to. I would of course love if you would reference it and help spread the word. Also, come over and tell me about your design so I can see what you are making. 
If you want to keep up to date with what I am doing you can come ‘like’ my Facebook page or subscript to the knitting updates below (email only sent out once at the end of the month).

42 thoughts on “Super Sock Calculator

  1. [...] I needed to follow a recipe if I gave it my measurements. I began with socks and here I present the Super Sock Calculator. You can also add it to your queue or cast-on over on [...]

  2. John says:

    Sounds cool. I’d offer to test but I can’t knit :)

  3. Roylene says:

    I would love to test for you. Let me know if you are still looking.

  4. Judy says:

    I can test knit a pair of socks

  5. [...] Super Sock Calculator [...]

  6. Natalie Hodges says:

    Very cool!! I’m actually going to “test knit” your device for my daughter, Harmoni. I can NEVER EVER find sock patterns for her so I figured I would design some. This poor kid is 16 years old and 6’3″ and wears a woman’s 15 in shoes (US). She never gets to wear pretty socks. Not fun to be a 16 year old girl stuck wearing mens socks (and shoes for that matter) all the time. This should be interesting;o) I’ll let you know how it goes and link to your calculator in my project on Ravelry. I’m natshellok On Ravelry.

    • roued says:

      Thank you Natalie, that sounds like a great way to test the calculator. Please let me know if you run into any problems with it. Yes, and do link both to the calculator but also please share a link here or in the pattern comments on Ravelry so we can all see the socks progressing :-)
      I really hope it is useful to you!

      Eddie xx

  7. [...] Super Sock Calculator [...]

  8. Kim says:

    So excited to have found this!!! One small things – the live webpage version is slightly different from the PDF.

    At 28 sts/4″ gauge, for the heel, when i use the Baby 6-12 months US inch, the webpage says “Knit the short-rows till you have 6 stitches left in the center. They you pick up the stitches again till you reach the full half of stitches.” The PDF says ” Knit the short­rows till you have [ A ] stitches left in the center. Then you pick up the stitches again till you reach the full [ B ] stitches.”

    Am I missing something or would I have two different counts? WHich is correct?

    • Eddie says:

      Hi Kim,
      Thanks for your kind words. I’m so happy you are deciding to give it a try and I can’t wait to see your baby socks. I love making baby socks.
      So on to your question:
      You are right that the wording is different but the amount is actually meant to be the same. [B] is what I call ‘the full half of stitches’. I was just lazy with the web version. :-) But I will add the actual amount tomorrow so that it is less confusing.
      Thank you for point it out and good luck with your socks :-)
      xx Eddie

  9. Chiara says:

    Thanks so much for your video tutorials. The explanations are great and the calculator is really helpful. I wrote a post about your sock pattern as the best one.
    See my post here, if you like

  10. Jennifer says:

    Oh my goodness, I almost didn’t watch the video for the heels. I am so glad I did though. I love this technique and will be trying it with the socks I plan to knit for my son. Thanks so much for the calculator and the videos!

  11. I am 86 and home bound, but am going to do my best to knit a pair of socks. Enjoy reading all these posts.

  12. Patsy Rabe says:

    I have complete faith in you and know you will succeed in knitting a pair of socks. Love you Aunt Betty.

  13. Sandi says:

    Just starting my first pair of two at a time, start at toe socks…
    Two questions -

    When I am doing the increase at the toe do I increase on ‘both sides’ of the sock?
    When doing the heel do I do the triplets all the way back to each end (the same way the doubles were done)?
    Love this calculator – it has simplified the whole process for me.
    Thanks Sandi Dixon

    • Eddie says:

      Hi Sandi,

      Thank you for asking. You do the increase at the toe on both sides of the sock. Perhaps the video explains it better.

      And at the heel you work the triplets the same way as the doubles yes :-)

      So glad to hear that you find the calculator useful.


  14. Eddie's Room says:

    Thank you so much Betty :-) Good luck with your socks.

  15. Debbie says:

    learning to knit for the hubby’s diabetic foot and still figuring the right amount of stitches for the large calf. Would fitting the foot part and then do increases in the calf area and if needed decreases in the ankle area be the way to go?

    • Eddie says:

      Hi Debbie,

      Yes I think that figuring out the measurements for your husbands foot and then knitting the sock after that would be best. Then when you have rounded the heel you can easily increase/decrease as you see fit as you are just knitting round and round for however long you want them to be. And the best thing is that you can keep trying them on him as you go.
      Hope you are able to make some nice custom socks for your husbands poor feet :-)


  16. Despina says:

    The calculator seems a fantastic tool, however the numbers A & B don’t seem to be working. No matter which number I use for foot lenght and circumference, I always get the same results:
    A: undefined
    B: NaN
    Number C works just fine. I work on a MAC and tried both Safari and Chrome as web browsers. Cookies are on.
    Is anyone else experiencing the same issue?

  17. Barbara Russ says:

    This heel technique is FANTASTIC… Very neat in appearance and doesn't require the dreaded picking up of unevenly placed stitches nor vast amounts of counting/concentration when the rhythm is established. Brilliant – many thanks.

  18. Christy Mountjoy- Ketchum says:

    Will you ever create an app for your calculator?

  19. Elisia Kuhfuß says:

    I think this needs to have a negative ease component added to the calculator and a 'where to take measurements' from chart to get a better fit. Ended making socks that were too big from this.

  20. Eddie's Room says:

    Thank you for asking Christy. I would like to make it into an app but it is unfortunately not something I have the time for just now. It should however be possible to use the calculator from a phone?

  21. Eddie's Room says:

    I am sorry to hear about your socks. It is not possible to introduce a negative ease into the calculator at this point but you are very welcome to post your solution for this either here or on Ravelry for others to be inspired by.

  22. Whimsy Bee says:

    Does this take into account negative ease, or do I need to subtract the ease from the measurements before I plug them in?

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