Estimated raw weight of one portion spaghetti for a main course?

The estimated raw weight of one portion of spaghetti for a main course is 50-75 grams.

Here's why:

* Portion size: A typical portion for a main course is considered to be about 1 cup (240 ml).

* Cooking shrinkage: Spaghetti shrinks considerably when cooked, meaning you need to start with a larger amount than what you end up eating.

* Personal preference: Some people prefer a larger portion, while others prefer a smaller one.

Important Note: This is just an estimate. You can adjust the amount based on your individual needs and preferences.