How much yarn do I need?
I crochet as a hobby, my son made me this calculator to help me plan my projects. Feel free to download it and use it.

Download the file by clicking this link:
https://docs.google.com/spreadsheets/d/1hG017V4XaeHHm7q_mmxInMvsZjUBUBwAp4nBkp0L1Tw/edit?usp=sharing
Then you can email it, copy it to your google drive or download by clicking “File” “Download” and select Microsoft Excel (.xlsx) or OpenDocument format (.ods)

Once downloaded, change the blue fields. You can change your hook size (up to 10mm), project size (in inches), how many yards your skein has and also price.
I hope this is helpful!