How many kilo of spaghetti need in 12 person?

It's impossible to say exactly how much spaghetti you need for 12 people without more information. Here's why:

* Appetite: Some people eat more than others!

* Side Dishes: If you're serving other dishes, you might need less spaghetti.

* Serving Size: Do you want a light side of spaghetti or a full main course?

Here's a general guideline:

* Light Side: 50-75 grams (1.75-2.6 oz) per person. This would be about 0.6-0.9 kg (1.3-2 lbs) for 12 people.

* Main Course: 100-150 grams (3.5-5.3 oz) per person. This would be about 1.2-1.8 kg (2.6-4 lbs) for 12 people.

To be safe, I'd recommend getting 1.5-2 kg (3.3-4.4 lbs) of spaghetti for 12 people. This should be enough even if some people have larger appetites.

Tip: It's always better to have a little extra than not enough. You can always save any leftover spaghetti for another meal!