It depends on what kind of food is in the can; peaches or chili, for example. As a rule of thumb you can figure 24-25 4 fl oz servings to a can. With something like peaches or apricots there may be fewer. The best way to know for sure is to read the nutritional label which will tell you what their suggested portion size is and how many portions there are to a can. You can then calculate how many servings there if you are serving a different portion size. Many manifactures post their nutritional labels online.
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A number ten can is 215 cubic inches. This is about 15 cups. If there's a lot of water in the can then the # of servings are reduced. A serving of beans is often 1/2 cup but this is not the same as a portion size (often 2-3 servings). So a number 10 can might have between 25 and 30 servings or 8 to 15 portions.
For instance Furmano's Pinto Beans in a #10 can indicates there is 26 (1/2 cup) servings in 1 can.
In the canning world, there are no longer #10 cans. They exist only in the memories of restaurant and food-service workers.