Do you do crochet maths? I find myself doing it fairly often with new projects. It’s all about knowing you have enough wool for the item you want to make. I find that it is necessary because I am always scrimping on wool. I’m not going to buy 8 balls of wool if I only need 6 or 7. I also find it really useful when I’m making a blanket because I want to make it as big as possible without running out of a particular colour half way through a pattern. So, how do you do crochet maths? You just need to weigh your wool! Here’s what I mean; I know that my ball of wool is 100g, after casting on and crocheting a first row of a blanket (not just the foundation chain, but the first complete row) I reweigh my wool – I now have a ball that weighs 85g. I can safely assume that 15g will be needed to crochet each row. Therefore, each ball of wool will create 6 rows (I like to have a buffer and 10g is perfect) I have 15 different balls of wool, therefore my blanket will be 90 rows in length (6 rows x 15 balls), I also know that one row has a depth of 2cm so I can calculate that my blanket will be 180cm long!
Weigh your work, weigh your remaining wool and measure your row depth, it all helps you know you are on the right track.