salad bar?

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Can I get some suggestions for calculating the calorie content of a salad bar? There are a few entries in the database, mostly in cups. I would rather go by weight, but even then I am not sure how to go about calculating. Yesterday it had:

- Chicken
- Peas
- Beets
- Chick Peas
- Romaine
- Mushrooms
- Onions
- Peppers
- Olives
- Vinegar

The total weight was 1 pound, and while I know some items weigh more than others, is there some way to count this with any sort of accuracy?