I’ve given yarn usages a lot of thoughts for the last two weeks. My aim was to estimate yarn usage in a sweater without knitting it. I wrote functions in the program to count all the stitches and strands in a multicolored sweater recipe. By strands I mean the yarn between stitches in pattern of the same color in a multicolored pattern.
I read somewhere that in a single color sweater you should count the stitches and multiply them by 3 times the stitch width. I’m having trouble verifying this because I can’t find a recipe for a single color Lopi sweater.
So I want to find the right index to use as a multiplier.
When the yarn is totally slack the strands are very close, so you could estimate that stitch width is equal to 4 times the yarn diameter. To test this I used the pencil method. I used Lett-lopi that gives the gauge of 16 stitches to 10 cm with a 4 mm needles. I wrapped it 4 times a round a pencil and measured it against one stitch. One stitch is less than 4 rounds it’s probable somewhere between 3 and 4 rounds. A gauge of 16 stitches to 10 cm gives a stitch width of 100 mm / 16 = 6.25 mm. Then I measured the diameter of the yarn by wrapping it a round a pencil until the rounds filled 50 mm. I counted 23 rounds so that would give yarn diameter of 2,17 mm. That is more like 3 times the stitch width.
So now I have the diameter of the curve that makes up the quarter either by extracting the yarn diameter from the stitch width or as this stitch is 3 times the yarn diameter I can say that the diameter is 2/3 of the stitch width.
At last I have a formula I can try :
Yarn for one stitch = stitch width * 2/3 * Pi * 1.52 = > stitch width * 3.182 .
And then for the strands I’ll use multiplier of 1.2 because there needs to be a slack in them. I will make a test in the software and compare them with as many classic Lopi recipe as I can.
Please comment on this post if you have any knowledge that might help me. In the next post I will wright about the results.