Using a scale to determine how much yarn you have.

It happens a lot: you buy 7 hanks of yarn for a project, but only end up needing 6.25. How do you know how much yarn you have left? A digital scale can tell you.

Let's use Cascade 220 as an example, since I know that each 100g hank has 220 yards. 220 divided by 100 is 2.2, so 2.2 yards weigh one gram. If I weigh my yarn leftovers and have 30 grams, I simply multiply 30 by 2.2 to figure out how many yards I have remaining - in this case, 66. Now you know exactly how many yards you have left and can search for patterns that will work with your yardage.