 # Calculating Yardage: Weight Formula The Calculating Yardage: Weight Formula is really great if you have a brand spankin’ new skein of yarn. You CAN use this method if you don’t have a brand new skein; it just takes some more numbers and math. If you don’t have the label, you’ll have to find that brand and label on Google or Ravelry. To weigh your yarn, you can use a postal scale if you have one. If not, grab your kitchen scale! Let’s dive in on how to use this formula.

## Finding Measurement Units on Your Yarn

All yarn labels will contain information on how much the skein of yarn weighs. This may include ounces and/or grams. Skeins of yarn will also include a length measurement unit. This may include yards and/or meters. If you take a look at the I Love This Yarn! skein below, you can see it includes all four.

This yarn weighs 7 oz, or 199 g, and contains 355 yards, or 325 meters. Read more about the units used when writing crochet patterns in my Calculating Yardage for Crochet Patterns E-Book!

## Calculating Yardage: Weight Formula with a New Skein

1. First, determine the length per weight for your skein based on the original label. Divide your unit of length (whether that’s yards or meters) by your unit of weight (ounces or grams.)
2. Work up your project following your pattern.
3. When you are finished with your project, weigh the yarn that remains in your skein, without the label. Even though it doesn’t weigh much, you don’t want to skew your numbers.
4. I mentioned in step 1 that for each ounce or gram, there is a set length. You need to multiply your ounces or grams remaining by that length. Remember, this gives you the amount REMAINING in the skein after working up your project.
5. Since you now know the amount of yarn that remains in your skein, you need to find out how much you USED. This part is simple. Subtract the yardage remaining from the yardage with which you started.

## Calculating Yardage: Weight Formula with a Partial Skein

The only thing that changes if you did not start with a brand new skein is that you need to weigh your skein at the beginning and find out how much you have remaining compared to where the skein started to determine your length per weight. If you don’t have the original label, but know the brand, search on Ravelry to find the original specs! Here are the steps laid out for you:

1. In the example above using a new skein of yarn, you figured out how to find your length per weight of the original skein. Divide your unit of length (yards or meters) by your unit of weight (ounces or grams.)
2. Weigh the ball/skein of yarn that you have.
3. Take the weight you have left and multiply it by the length per weight determined in step one.
4. When you are finished with your project, weigh the yarn that remains in your skein again.
5. Just like in step 3, you need to multiply your ounces or grams remaining by the length per weight from step one. Remember, this gives you the amount REMAINING in the skein after working up your project.
6. Since you now know the amount of yarn that remains in your skein, you need to find out how much you USED. This part is simple. Subtract the yardage remaining from the yardage with which you started.

Having a hard time visualizing all of this? The Ultimate Workbook on Calculating Yardage for Crochet Patterns includes exclusive worksheets to help you work through these formulas.

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