Common Mistakes
1. Yarn amount listed only in grams and/or ounces
The mass (in grams and/or oz) will only be accurate if the knitter uses yarn with the exact specifications as the one used to knit the sample. You will likely measure the amount of yarn used in your sample by weighing it, but you should convert it to metres/yards when adding the information to your pattern.
For example, if the yarn you used comes in 192 metre/115g skeins and your sample weighs 95g:
192 metres / 115g = 1.66956522 metres per gram 95g (sample weight) x 1.66956522 m/gram = 158.6 metres*
*I should mention that it is common practice to round up (often to the nearest 5 metres/yards) and add a bit of a buffer to ensure the knitter does not run out of yarn. I personally add 10 to 15%, depending on the item, but your mileage may vary.
2. Yarn amount listed only in "number of skeins" of the sample yarn
If you are including the name of the yarn used in the sample, it's ok to list the number of skeins. However, it's still best to also include the actual metres/yards required as it makes it easier for the knitter to substitute yarns. I'm sure I'm not the only one who has found themselves standing in a yarn store trying to convert the yarn requirements in a pattern from X skeins of yarn A to Y skeins of yarn B (or to have made a mistake doing so, only to get home and realize I've bought too much/too little). Being specific about the amount of yarn will reduce the margin of error.
3. Typos/mistakes in the name/brand/base of the sample yarn
This is one of the most common errors I see. When listing the exact brand/base of yarn used in the sample, be sure to do so accurately. Look at the ball band, manufacturer's website, and/or the yarn entry on Ravelry to be sure.
For example, based on this yarn entry in Ravelry, how should this yarn be referenced?
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