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What is Gauge? What is a Gauge Swatch? How to Knit a Gauge Swatch and Why It's Important

Updated on April 17, 2012

Grab your knitting needles and your favorite yarn! Knitting a gauge swatch will guarantee results and save you time. And honestly, don't you need a good excuse to start handling that fabulous yarn?

You just knit a sweater for the love of your life and you are horrified - just horrified - to see that you, who have been knitting complicated scarves and shawls for at least a year, have just committed that most comical of knitting stereotypes. The sleeves are hanging around his knees, the body fits him a little too much like a glove and the poor guy's face is turning purple because the neck is a wee bit too tight. What went wrong? Well... you probably didn't knit a gauge swatch. And if you had, your poor boyfriend might never have worn that sweater to his nephew's wedding and passed out just as the bride was walking down the aisle. Read on to learn the why's and how's of knitting a gauge swatch. Your love will thank you.

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What is a gauge swatch?

A gauge swatch is a vital part of knitting if you decide to knit any garment that will be worn and size is relevant. If you were to knit a scarf, which is only as long as you choose - and you can stop anytime - then a gauge swatch is not necessary. If you were to make a cardigan, however, and you want to be sure it fits you comfortably around the waist and the sleeves hit just at your wrist, a gauge swatch will save you valuable hours.

A gauge swatch will tell you how many stitches you will garner in any given amount of inches using a particular type of yarn and a particular size needles.

Far too wide, and much too short. Bad, bad, bad. I knit this same garment three times before giving up, rewinding the yarn, and making a tank top instead. It was too big and I gave it away. Do a gauge swatch!
Far too wide, and much too short. Bad, bad, bad. I knit this same garment three times before giving up, rewinding the yarn, and making a tank top instead. It was too big and I gave it away. Do a gauge swatch! | Source

How do I knit a gauge swatch?

As a knitter, and one with severely limited time, I understand the impatience that can grip anybody drooling over a beautiful pattern. But a gauge swatch must be done if you don't want to waste hours or possibly miss the perfect weather for that cardigan (I have, out of spite, worn a sweater in the dead of summer just because I wanted desperately to wear it, but I don't recommend this. That day is blurry in my memory!).

If you are using a pattern, take note of the section before any directions that reads "Gauge." Gauge is often given by designers in a stitches per 4 inches format, the 4 inches giving you plenty of space to account for half stitches (which does make a difference, as I will show you below). There is also a row count, so you may see something like this:

Gauge: 24 sts and 28 rows = 4" in stockinette stitch

That is the gauge you must get to follow the directions for your size and end up with a garment that fits you properly.

With those numbers in mind, take up the yarn and needles you would like to use for the project* and cast on at least the number of stitches called for in the 4 inch square then add at least 15 more stitches. The extra 15 stitches will leave more room for proper counting; without it, you may end up pulling and fussing when counting stitches, all of which inevitably leaves you with wishful thinking rather than actual stitch count. Cast on that new number. (*Hopefully you chose a yarn and needle size similar to that called for in the pattern.)

For the above gauge, I would have cast on 39 stitches, but because I have OCD tendencies in my knitting, an even 40 will set me right. Then,

  • knit at least 6 rows in garter stitch to make a sturdy border (that is, knit every row for 6 rows. Knitting every row will create a "ridge" after two rows; therefore, 6 rows will create 3 easy-to-count ridges).
  • knit 4 stitches
  • knit the stitch recommended by the gauge requirements until 4 stitches remain (in this example, we are doing stockinette stitch, so I will knit this row and purl these stitches when we turn the gauge swatch)
  • knit the remaining 4 stitches.

Continue in this pattern until you have knit at minimum the recommended row count (in this case, 28) and then knit 10 more rows, again because you want enough extra room for accurate counting.

SPECIAL NOTE: You will often need to knit several swatches before you hit on the perfect pairing of yarn and needles. To avoid forgetting what needles you used to obtain the perfect gauge, I will often purl a number of stitches in the middle of the swatch equal to the size needle I am using. So I will knit about 15 rows and go in about 15 stitches, then if I am using a size 6 needles, I will purl 6 stitches. This will let me know that that swatch was knit with a size 6 needle. I recommend you do this! It will make you less crazy (the other crazy you must resolve on your own!).

Of course, knit 6 more rows in garter stitch and bind off.

A good gauge swatch, done with patience, means a good fit. The Double V Cardigan, from Interweave Knits.
A good gauge swatch, done with patience, means a good fit. The Double V Cardigan, from Interweave Knits. | Source

Wash and block your swatch

I know. You thought you could just count the stitches and be done, then cast on for the cardigan you see yourself wearing next month at the social, right? Sorry... I plan on being sure you do this right so that everyone gives you compliments too.

If you are taking the time to knit yourself a garment, you probably plan on taking care of it. That means, you might want to wash it at some point; therefore, it is crucial you wash your swatch as well. It would be terrible for all of us if you washed your garment after five uses, threw it in the sink to wash, and ended up with something two feet longer than it used to be. These things do happen. Avoid it! Wash your swatch and block it as you would your garment. It is the number after washing that will tell you if you have chosen yarn and needles wisely.

Learn why and how to block a sweater and other hand knits or crocheted garments.


Using a knit-check ruler by Susan Bates, sewing pins and a business card, carefully count your stitches and rows.
Using a knit-check ruler by Susan Bates, sewing pins and a business card, carefully count your stitches and rows. | Source
A gauge swatch with pins marking a four inch section.
A gauge swatch with pins marking a four inch section. | Source

Counting your stitches

Since you have been so patient and given your garment-to-be the respect it deserves, take your washed and blocked and dried gauge swatch to a flat surface and get ready to count.

Accuracy is key. I like to use pins (typically the kind used for sewing) and a metal ruler, or in this case, a guide that shows me needle sizes as well a gauge window for counting stitches.

If the given gauge by the designer specifies 4 inches, count the stitches for 4 inches - do not cheat! Being off by even a half stitch will have consequences in the final garment.

Place your ruler to the edge of your swatch and move in about three or four stitches from the garter stitch edge. Carefully place a pin at the edge of the first stitch you will count. Move to the other end of your ruler, and at exactly 4 inches, place another pin. Be accurate! If 4 inches ends in the middle of a stitch, mark it at the middle of that stitch. Be sure your swatch is lying flat and do not pull or stretch!

Using a needle, start counting. I will sometimes also use a business card. I find that focusing so closely on the stitches makes me see double, that and the anxiety makes me insane - a small tool like a business card really helps me stay clear-headed and count accurately.

Count them again.

How did you do?

Knowing your gauge can help you refigure the numbers of a pattern so it fits the gauge you did get.
Knowing your gauge can help you refigure the numbers of a pattern so it fits the gauge you did get. | Source

How Does a Gauge Swatch Work? (Or What I'm Really Asking Is: Why Should I Care?)

Let's say you counted and you're off by 2 stitches. Seems small enough - let's start knitting, right? Wrong. Here is a scenario:

If I choose a bulky weight yarn and big needles, I may get about two stitches per inch of knitting (or, put in terms of our 4 inch swatch, 8 stitches = 4"). If I knit with a fingering weight yarn, however, and started with small needles, such as size US1, I may get 8 stitches per inch of knitting (or 32 stitches = 4").

Imagine somebody decided that because they have 8 balls of a bulky weight yarn they will use that yarn to make their first sweater. They immediately start in on the project.

Body: Row One: Cast on 144sts

This will be one enormous sweater. At 2sts for every inch of knitting, casting on 144sts will yield a whopping 72 inches of body. Did I mention that this sweater is for herself (thank goodness) and she is a petite 5'1" with a 32" bust?

Here is how the math works out: 144 cast on stitches divided by 2sts/inch = 72 inches. Or, put in terms of a 4" swatch: 8sts = 4" so 8sts divided 4 = 2sts per inch. 144 cast on stitches divided 2 sts per inch = 72 inches.

If she had knit a gauge swatch, she would know that this is a bad idea.

Let's say she started with the fingering weight yarn. 144sts divided by 8sts/inch = 18 inches.

Whoops. I don't think that's going to work either.

But 2 stitches off? Well... let's see. Say she got a gauge that was 22 sts per 4 inches in some other yarn/needle combo.

22sts divided by 4 = 5.5 sts per inch

144 sts divided by 5.5 sts per inch = 26.181818 inches

Still too small. Two stitches per 4 inches does make a difference!

Purl bumps indicating the size needles I used for this swatch - a size 5, in this case.
Purl bumps indicating the size needles I used for this swatch - a size 5, in this case. | Source

Okay, I get it. What are some other tips?

Trying to get gauge is an exercise in patience. You would think that knitters are loaded with the stuff considering how long it takes to create something, but I have found the opposite to be true. We are always on the go, keeping careful track of our progress, imagining how it will look, what the recipient will say, etc. And sometimes we just want the whole mess done with! I get it. So say I did the swatch above and I was two stitches shy, and the swatch before that came out, miraculously, exactly the same with another yarn. What should you do?

Another swatch.

Ha! Try again with different sized needles. Compare the yarn you are using with that which is recommended in the pattern. Find the label information and see if the yarns are even compatible by comparing the gauge information provided therein. And there is always Ravelry, that beautiful social network for crazy folks like us. See what other knitter has already been through the trial and tribulation of swatching and see what they used. But please. Do me proud, folks. Still knit your own swatch. You never know if that knitter washed their swatch before knitting - today it fits like a glove; tomorrow it fits like a latex glove.

You have been warned. Tarry forth!

© 2012 Christen Roberts Comer

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    • BigSerious profile imageAUTHOR

      Christen Roberts Comer 

      3 years ago from Harrisburg, PA

      Yes! It's amazing. Though it can be frustrating to take that extra step, it's satisfying too. It enables us to learn a lot about our own unique knitting style and tension. So glad you figured it out! I have a friend who consistently knits more tightly than the recommended needle size in patterns. Swatching has helped her have more satisfying results.

    • jennabee25 profile image

      Jenn Dixon 

      3 years ago from PA

      I have learned this the hard way so many times. I have two sweaters that are HUGE. I need to go AT LEAST two needle sizes down for any given pattern. How did I realize this? Swatching, and taking it seriously.

    • BigSerious profile imageAUTHOR

      Christen Roberts Comer 

      4 years ago from Harrisburg, PA

      Yes, Kschimmel! It is surprising to many that one of the beauties of knitting IS the math - it is presented not as numbers but as shape and texture. I actually love it. I had read that cookie a (the sock designer) took to knitting because it appealed to the mathematician side of her. And it's true. That said, I think another big factor in skipping gauge/swatching is impatience. We really just want to start, but - what is the point if you're unhappy at the end? SWATCH, SWATCH, SWATCH!

    • kschimmel profile image

      Kimberly Schimmel 

      4 years ago from North Carolina, USA

      People fear gauge because it involves--gasp--math! It is so important, though. I sometimes use knitting to show kids how practical math is.

    • BigSerious profile imageAUTHOR

      Christen Roberts Comer 

      6 years ago from Harrisburg, PA

      That's great you've had such good results! Sadly, I cannot say the same for me. :) I am a big yarn substitute-er though, and swatching is so necessary with that. I also like garments with negative ease, or that fit me exactly - so swatching it must be. :D Knit on!

    • Riverfish24 profile image

      Riverfish24 

      6 years ago from United States

      I am a crazy new knitter and I saw your Hub a couple of days back and didn't have the time to read..today finally I actually searched for Natashalh's comment and tracked your hub down! (I remembered she had left a comment :) Good info..but honestly..I haven't done it myself yet..shame on me...but I make sure I use the right needle size and usually it matches what is recommended for the yarn type. I'm on my 4th sweater now and thankfully no bad stories to tell at all!! But yes, from all that I have read, I would totally agree with you!! Good luck.

    • BigSerious profile imageAUTHOR

      Christen Roberts Comer 

      6 years ago from Harrisburg, PA

      Ask me how I learned why a swatch is important? Hahaha. Even now, knowing all that I do, I have to grit my teeth when it comes time swatch. But like a good run, I feel pretty proud of myself afterwards. :) Thanks for the vote up!

    • Natashalh profile image

      Natasha 

      6 years ago from Hawaii

      Too many people skip making a gauge swatch because they think it's a waste of time when it's actually a huge timesaver! Hopefully someone puts your advice to good use and saves themselves a whole lot of trouble. Voted up and useful!

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