Ok, I apologize for the bad pun in the title… My kitchen scale often comes in handy when I’m trying to make use of oddballs and extra bits of yarn. If you’re wondering how much yarn you have left on a skein or ball that’s already been started, just weigh it on a postal or kitchen scale. Compare the number of grams to the total number of grams on the label. With a little simple math you should be able to figure out how many meters you have left.
For instance, say it was originally a fifty gram ball, 150 meters and you have 30 grams remaining. 150 meters to fifty grams is 3 meters per gram. If you have 30 grams left, you have 90 meters.