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Many times they buy the freeze dried food thinking it will provide more than it will. Many of the entree’s only allow for 200-300 calories per serving.

Agreed.

I haven't lived on freeze dried and dehydrated foods other than using them on camping trips. I have also prepared and sampled them to learn how to prepare, how much to prepare, etc.

In my limited experience I would say the recommended serving amount on most containers is overly optimistic. It seems more like the minimum required nutrition for bare subsistence when you are not physically active.

For calculating how much to store I figure on about 1/2 to 2/3 as many servings for an active adult as shown on the container.

I think that is a much more realistic expectation and might even leave a little bit of a safety margin too.

Iron Munro:"In my limited experience I would say the recommended serving amount on most containers is overly optimistic.
It seems more like the minimum required nutrition for bare subsistence when you are not physically active."

Correct , the portions are generally undersized despite what is listed on the labels, generally over-stated by 1/3.
Besides food value , also take in consideration calorie content , and fats . Both are needed for general nutrition.
Also , if using MRE's for longer than a couple days , pack in some Metamucil for 'regularity'.
Consider vitamin supplements ,duplicates of glasses/ or contacts, extra medications, first-aid kit , canned meats, etc.
As the LDS say : "Store what you eat , and eat what you store (food rotation)