I found a thread on Ravelry the other day about flashing the stash, and aside from the arguments about whether it should be done in April or now, it was quite cool to see everyone's displays!

That is a king-size bed. Click to embiggen the picture -- in the front is the sock yarn, in the upper left is the denim, in between is the Felted Tweed , to the right is miscellaneous stuff of all weights and amounts.

As you see, I will not even half this by making 5 or 6 or 7 pairs of socks!

I don't have too many sweater-lots of yarn, but I do have enough to keep me going for a long time!
A pair of socks uses up one ball of 100g, and takes {ahem} a week or two or a month. A lace shawl would take a long time, and use up one or two of those balls on the bed. A sweater takes up 10 or 20 balls of yarn and could keep me amused for anywhere from a month to a year!
So how does one calculate how much knitting one has stored up in one's stash? Or is this just a silly question....
All I know is that I have enough yarn for now, and hope to have maybe a single bed's worth at the end of the year!