Thank you for that information. For future reference you do not need to start another thread to ask a question that is of a similar fashion. If you were to add this thread question to the other threads you had already started, then it would show at the front of all other threads in this topic forum.....if that is what you were concerned about.
Main ingredients in recipe I want to use:
1/2 C Butter
2 C Cream
1/4 C Parmesan Cheese
12 oz. Fettuccine
Recipe says will serve 3 (I'm not so sure)
How much of each would I need for 300?
This was your original post. It does not clarify if it was for a main or side dish so you received the proper (and acceptable) information as per your post. We are, after all, fully trained chefs with the knowledge and experience to calculate proper proportions via weight or volume which most recipes are written. @chefbuba
,in both your threads, have given you great starting advice which I am sure will make you look like a star cook come the day of your event.
If you have trouble with figuring out weight to volume there are some great sites that will do the calculation for you. Here is one for you.