You can learn more about yarn weights, below.
Yarn weights are known by many names. Fingering wool is fine, and only thread-weight wool is finer.You can review the chart, below, to see where fingering wool fits into their scale of yarn weights.
To figure out the weight of yarn, you can use a scale to measure the weight in grams or ounces. Yarn weight is typically categorized into different categories such as lace, fingering, sport, worsted, and bulky, which correspond to different thicknesses and weights of yarn. You can also refer to the yarn label or manufacturer's information for the weight and yardage of the yarn.
It depends on what weight the yarn is. There are charts giving approximate values for common weights such as worsted and fingering, but to find out the exact number you have to measure for yourself or consult the label, if it's a commercial yarn.
To measure yarn weight accurately, use a yarn scale to weigh a specific length of yarn. Compare the weight to a standard yarn weight chart to determine the yarn weight category.
The number of plies is independent of the weight or fiber content of the yarn. It is possible to have a single ply super bulky like Brown Sheep's Burly Spun, or something like the 8 ply fingering weight on my sock needles right now. If you want to know the plies in a specific yarn, we'd need to know the brand name and yarn name.
There is no hard and fast number that I could give you as an answer. It all depends on what the yarn is made of, what "weight" the yarn is (sock versus bulky, for example). So, as asked, this isn't really an answerable question--there is too much unknown about your yarn to answer with any certainty. My best suggestion would be to go to the yarn manufacturers website and look there for your answer. Or, go back to where you purchased the yarn, and ask there.
Yarns vary, but generally about 170.
To determine the weight of yarn, you can use a tool called a yarn scale. Simply place the yarn on the scale and it will give you the weight in grams or ounces. This helps you choose the right yarn for your project.
There is approx. 150 yards in 50 grams of WORSTED weight yarn so approx 2250 yards in 750g. That is very approximate as different yarns weigh differently and contain different yard amounts in a skein. If you are asking about fingering, sport or chunky weight, the answer would be different.
The common suggestion is to substitute two strands of sport weight for 1 strand of worsted weight. However, everyone's tension is different. If your pattern has a gauge, I would suggest you crochet a small swatch and see if the gauge matches, using your tension. If it is too large, there are other variations you can try. 1 strand of fingering or sock yarn with 1 strand of sport or DK yarn, for example. Of course, that would necessitate having or buying more yarn.
To determine the weight of yarn without a label, you can use a scale to measure the yarn's weight in ounces or grams.
It will depend on the type of yarn. 225 yards of worsted weight yarn is about 100g, but 225 yards of sock weight yarn is about 25g. What is the yarn type?