Best way to measure Spaghetti/Linguini portions? What's the best way to measure how much Spaghetti/Linguini is 1-portion. I know there are tools which basically measures the diameter of the bundle of dry spaghetti. But are there simpler tricks which don't require any tools?
Italians weigh it and it's really the only fail-safe way.  Using a kitchen scale with a big bowl on top should work for just about any pasta shape.  40g for a small portion, 100g for a big plate full.  Cooked volume will depend on the type of pasta, but with spaghetti for example about 55g of dry will produce about 1 cup of cooked spaghetti.

This agrees with @Martha: 2oz = about 57g and 1 cup cooked sounds like a reasonable serving size.  Even if I would eat more :-)