How to Knit a Helpful Swatch – Part 4 Swatching to Estimate Yardage Needed

August 24, 2020| LindyBeir| 0 Comment | 8:00 am

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I have covered the basics of how to make a Gauge Swatch and calculate your stitch and row gauge in my previous three posts. Today’s topic will cover some basic math to help you estimate the yardage that you need using your yarn, your needles, and your gauge to make a sweater.

Let’s say you want to make a sweater using yarn from your stash and you need to know if you have enough to make it. To make this estimate, you need the measurements for the sweater you want to make. If you are using a pattern, the finished measurements should be stated within the pattern – ideally on a schematic. Some patterns may only state the desired measurements within the text of the pattern and you may have to read through to find them. If you are making the sweater without using a pattern – you would use the measurements of the individual who will be wearing the sweater.

The image below shows a schematic for the back of a sweater of a drop sleeve sweater. The back is 28 inches long from the hem to the neck and it is 20 inches wide. Both the front and the back of this type of sweater are essentially rectangles.

The schematic for the sleeves of this sweater are shown below.

At this point, you have the numbers you need to calculate the number of square inches of fabric that you need to make for this sweater. For the front and back, multiply the length by the width on the schematic and then multiply that number by 2. Using the numbers from my example above:

20 * 28 = 560 560*2 = 1120 square inches for front and back.

The sleeve is a trapezoid shape. The formula for the area of a trapezoid is:

[(b1+b2) * h] / 2

Where b1 is the width at the bottom of the sleeve(8”) and b2 is the width at the top of the sleeve(15”) and h is the length of the sleeve(18”). Using the numbers from the sleeve schematic, the area for one sleeve is 207 square inches. Since you need two sleeves, you then need to multiply the area of the sleeve by two. (414 square inches)

Now, here’s a short cut – if you place your sleeves next to each other so that the tops of the sleeves are parallel – you have a parallelogram. To get the area of this parallelogram you simply multiple the width(15”+ 8” = 23”) by the length(18”). Try it – you’ll get the same number as above.

Add the square inches for the front and back to the square inches for the sleeves and you have the total number of square inches of fabric in the sweater. Now that you know the total number of square inches of fabric you need, you will need to use the yardage and weight information of the yarn you want to use to estimate how many skeins or balls of yarn your sweater requires. The yardage per weight of the yarn will be found on the yarn label – see image below:

You will use the yards per gram value in the estimate for total yardage. Now you need to knit a swatch. The swatch should be in the same stitch pattern that you plan to use for the body of your sweater. This swatch does not need to be the same size as your gauge swatch, but it should be wide enough and long enough to get an accurate weight, length and width measurement. After you knit this swatch, you will measure its weight using a scale that measures to the nearest tenth (0.1) of a gram. Next measure the length and width of the swatch and multiply these values together. This gives you the number of square inches in your swatch. Now divide the number of grams by the number of square inches.(Do not round). You now know what 1 square inch of your yarn weighs. This is the number you need to calculate how much yardage you need for your sweater.

Example: My swatch measures 3.5 inches by 4.5 inches, which gives me 15.75 square inches. The swatch weighs 9.6 g. Dividing 9.6 by 15.76 gives me 0.622 g/square inch.

Here’s the final set of calculations:

Take the total number of square inches of fabric and multiply it by the number of grams per square inch. This gives you the total weight in grams for your sweater.

Total Number of Square Inches * grams/inch² = Total grams of fabric

Total Grams/Square Inches = (1120 + 414) * 0.622 = 954.148 g

Now take the yards per gram value from the yarn label. (For example 218 yds/100grams). Divide the yds by the grams to get the number of yards in 1 gram of yarn. (For example: 218yards/100grams = 2.18 yards per gram.) Multiply the total number of grams of fabric by the number of yards per gram to get the total yardage for the sweater. Using the numbers from the examples above:

Yards per gram = 2.18 yds/g

Total Yards of Yarn = 954.148 * 2.18 = 2080 yds

To determine the number of skeins, balls or hanks of yarn you need: Divide the number of yards by the number of yards in the skein. Or divide the total number of grams by the number of grams of the skein. Remember that you will want one extra skein for swatching. (In my example, I would need 9.5 skeins, so I would want 11 skeins with one extra for swatching)

What to do if you don’t have the yarn label

To determine how many yards of yarn you have when you do not have the yarn label or any information, simply measure out 10 yards of your yarn and weigh it. Divide the weight by 10 and you have the weight for 1 yard of yarn. Now weigh the skeins/hanks of yarn and multiply by the weight of 1 yard. This will give you the number of yards for each skein/hank.

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WIP: Cardigan & Romper for New GrandsonWIP: Cardigan & Romper for New Grandson

November 15, 2009| Lindy| 0 Comment| 10:29 am

Okay — I swatched some more on this cardigan project. Earlier I had posted about Things Learned from a Swatch. Well, I continued to be dissatisfied with my color selections — I really just do not like that light aqua color for this sweater. So, I went back to my LYS and bought up all the teal color they had — which is the color I really wanted for the main color on the cardigan. The problem is that there isn’t enough of this color to do both a cardigan and a romper to match.

So, standing in front of the yarn bin at the store, I decided that I’d try using a combination of the teal, the red AND a darker blue. There was enough of the darker blue in one dye lot to do the romper and there was 1 ball of another dye lot left. Since I only need 1 ball of the darker color to do the alternating 3 color pattern in the cardigan, I bought this ball as well because the color variation is not that different between the two dye lots and since it will be mixed in with the other colors, it should work out okay.

Swatch_Cardigan3 Here’s my swatch with the new color scheme added. The darker blue color definitely shows up better than the lighter blue against the teal color that I want for the main color. I have started knitting the romper in the darker blue and I think I’m going to really like the coordinated outfit that will result. This project is a bit challenging because I am knitting on size 0 and size 1 needles to get the right guage. Lots and lots of small stitches…

How to knit a Basic Beanie without a pattern – Part 1: Brim and BodyHow to knit a Basic Beanie without a pattern – Part 1: Brim and Body

April 29, 2024| LindyBeir| 0 Comment| 11:33 am

I have read several Facebook posts and Ravelry forums where new knitters are asking about how to knit a basic hat. There are many basic beanie style hat patterns available for free on Ravelry, including one of mine: Basic Beanie Hat.

But the truth is that a basic beanie hat is fairly easy to knit without any pattern if you are familiar with its structure and know your gauge for the yarn you want to use for the hat. So this post is about the basic structure of a beanie, knit in the round.

Now, a beanie can be knit top down or bottom up, but if you look at most patterns, they are written with a bottom-up construction and this will be the approach I will follow here. There are three parts to a basic beanie: The brim, the body, and the crown. The brim of a beanie is usually done in either 1×1 ribbing (k1,p1) or 2×2 ribbing (k2,p2). The length of the brim can be relatively short – and intended to not be folded, or it can be longer so that it will be worn with the brim folded.

The body of a beanie is the part of the hat that covers the head from just above the ears to where the crown is formed. The length of the body varies according to the size of the hat, with children’s hats being shorter than an adults’ and Men’s hats are usually longer than Women’s. For a basic beanie this length is approximately the length from the top of the head to the bottom of the earlobe or half the length of measuring from the bottom of one earlobe to the other up over the top of the head.

The crown of a beanie is the area that covers the top of the head and is shaped by making decreases to form a circle that is closed at the very top.

To begin knitting the basic beanie you need to do a little math. You need to know what circumference you want it to be. If you have the measurement of the circumference of the head of person you want to fit, you can use that. If you don’t know the circumference, then you can use a standard size chart for the measurements. See the chart below. For a women’s head, I usually use a circumference of 21 – 22 inches as a starting point.

Knitted beanies are made with negative ease. Now what do I mean by that? Negative ease means that the knitted hat will be smaller than the actual circumference and I usually factor in about 10% negative ease for my beanies. This gives the hat a good fit and it hugs the wearer’s head and stays in place. Using an example of a 21 inch circumference, the knitted circumference with 10% negative ease is 19 inches. (10% of 21 = 2.1; 21-2 = 19 or if you prefer: 21 x 0.9 = 19)

You are now ready to determine how many stitches to cast on to start the brim of the beanie. For this you will need your stitch gauge in stitches per inch (spi). I usually have a gauge of 5 spi with worsted weight yarn, so in this example, I multiply 19 inches by 5 sts which gives me 95 sts. However, if I am doing 1×1 ribbing, I need an even number of stitches, so I can either round down to 94 or round up to 96 sts. If I do 2×2 ribbing, I need an even number of stitches, but the number also has to be divisible by 4. In this example, 96 is divisible by 4, so I would start with 96.

For a Women’s beanie, I usually like to knit the ribbing to a length of approximately 2 inches and then start the body. For a basic beanie, I knit the body in stockinette stitch. The body area is where you can add various textured stitch patterns or knit stripes using different colors of yarn. But the very basic beanie is knit in stockinette stitch.

The length of the hat is determined by measuring the length of the wearer’s head from the lower earlobe to the top of the crown. Another way is to measure the head from the bottom of one earlobe over the top of the head to the bottom of the other earlobe and then divide that number by 2. For a women’s hat, I usually use a length of 10.5 to 11 inches, for a men’s hat I use 11 to 11.5 inches. See the standard size chart above for further information. The crown of the hat is approximately 1/3 of the total length of the hat. So, once the ribbing is done, you knit the body to the desired length where the crown shaping starts (measured from the cast on edge). In my example of a women’s hat with a total length of 11 inches, I would knit to a length of 7.5inches. The remaining length of the hat is where the crown is shaped using decreases.

My next post covers things you need to consider to knit the crown of the beanie.

Things Learned from a SwatchThings Learned from a Swatch

October 12, 2009| Lindy| 2 Comments| 8:00 am

It took me years to appreciate the value of doing a swatch before starting a knitting project. I cannot tell you how many poorly fitted sweaters I knit before I came to realize that it truly was worth the time and effort to swatch first.

I learned this when I bought my first knitting machine. You see, when you are using a knitting machine, you can’t even get started without doing that swatch – as you need it to tell you if you have your machine tension set up correctly. It only takes one frustrating experience with a too tight tension on the knitting machine to convince you of the necessity for doing a swatch or two.

Swatching also provides you as a knitter the freedom to become, as Elizabeth Zimmermann says, “The boss of your knitting”. If you know your gauge, and understand the basics of the design you are wanting to make – you are free to modify any pattern – or MAKE YOUR OWN.

So, I always swatch. This last weekend I did a swatch using the Baby Ull yarns that I purchased to knit a sweater and romper for my new grandson due the end of January. I had a couple of extra reasons for doing this swatch beyond determining what size needle I needed to obtain the stated pattern gauge. First, I wanted to try out the three color pattern for the sweater and get comfortable with it. Second, I wanted to see if I liked the color combinations of the yarns in the color pattern.

Swatch_Cardigan1 Here’s a picture of the swatch. I cast on 44 stitches so that I could have a 40 stitch area surrounded by a 2 stitch garter stitch edging. I started using US 2 (3.00 mm) needles and then switched to a smaller US 1 (2.50 mm) needle for the last part of the swatch. I did a section of garter stitch, then stockinette stitch, then the color pattern using the lighter aqua blue as the main color and then switched to using the darker teal blue as the main color. I finished the swatch by doing a section of sockinette stitch on the smaller needles, followed by a section of garter stitch.

Here’s what I learned from this swatch: 1) I need to use smaller needles than what is stated in the pattern in order to obtain gauge. This is important because I want this sweater to fit. 2) I like using the darker teal blue as the main color – I think the lighter aqua blue shows up better against it than the other way around. This is significant – because I bought 7 balls of the lighter aqua and only 1 ball of the darker teal. (I have now ordered enough teal to make the sweater, as my LYS did not have enough of it on hand…) 3) The 3 color pattern is fairly simple and easy to knit. I think it’s good to practice such things before starting off on a special project like this.

So to those readers who “hate to swatch”: do you see the value of what I did here? Swatching is a valuable technique that helps you be the “boss of your knitting”. Now go swatch!