1) Weigh the remaining ball of yarn. This is most easily done on a food scale using grams (ounces are too big). While I don’t own one, I’m told a postal scale works well, too.
2) Knit one row.
3) Measure the ball again, noting how much lighter it is after the row. In my case, 2 grams.
4) Repeat steps 2 and 3 to confirm your findings—again, in my case 2 grams. I also unwind two grams off the scale and place a knot to test it by length as well as weight.
5) Since my ball after these steps weighs 22 grams, I now know I’ve got roughly 10 rows of yarn left. So I’ll plan on 8, ensuring I have sufficient yarn for the single-chain crochet bind-off the pattern calls for.
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