How do you know how much spaghetti to cook? Get a spaghetti measurer?

Spaghetti measurer has various designs, the most basic one comes with four different holes, indicating the diameter of dry pasta you need for one to four portions. Then there is another design that looks like a camera shutter. You adjust the dial for the portion you need, and the diameter of the shutter will be adjusted accordingly.  Good, a more compact device.  Still not happy with the single-use device? What about a spaghetti measurer cum trivet?  Instead of keeping the device somewhere in the kitchen drawer until you have almost forgotten about it when you are cooking spaghetti, it can be kept at a handy place for putting a hot pan on top.

Despite the interesting thoughts given to the design of a spaghetti measurer, I am never convinced that I need one of the above. What if I am not cooking spaghetti but say fusilli or fettucine? What if I am cooking for big/small eater? Will it be accurate? At the end of the day, if it has to be precise, get a scale; if not, just use your common sense to eyeball it. If you have leftover pasta, transformed it to a baked spaghetti casserole; if you don’t have enough, congratulations, that’s a sign that you cooked a delicious spaghetti.