1. Balance the pin of the balance arm in the slots on the sides of the balance.
2. Place a length of yarn in the notch of the arm.

3. Cut the yarn little by little until the arm is balanced.
4. Measure this length of yarn on a ruler.

5. Weigh the ball of yarn on a scale to find out the total weight of the yarn you have.

6. To know if you have enough yarn, you’ll need to do a little math. In this example, our yarn measured 15" in length. We multiplied 15 by 100 to determine that there are 1,500 yards per pound of this yarn. We then weighed the ball of yarn and learned that it weighed 4 ounces. To find out how many yards were in these 4 ounces, we solved a simple equation:
1,500 yd = X yd
16 oz 4 oz
First multiply 4 x 1,500 = 6,000. Then divide this number by 16 to give the total amount of yarn: 6,000/16 = 375 yards.