There I was, before I started knitting the Baby Surprise Jacket, fretting about the yarn requirements.
I eventually decided to leave myself a bit of breathing room, and combine two leftover colours. Which resulted, as you can see, in a rather nice stripey thing.
Problem is, I have no idea how much yarn I used. None at all. I used bits and pieces of partial balls, with some bits and pieces left over.
The answer is to weigh the jacket. I know how many meters are in 50gm of the yarn, so if I know how much it weighs, then I know how much yarn I used. Easy.
Problem is, you need a very accurate scale for this. One that measures to the gram. The sort of scale that drug dealers might use.
And I need one.
In the past, I've been known to smuggle balls of yarn and finished knitted objects into the mailroom at the office at the day job... but you do get very strange looks when you get caught with a bag full of socks, standing in front of the postage machine....