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There are approximately 8 fluid oz in 1 cup, but tuna is a solid matter, not a liquid one. If you drained canned tuna and pressed it into a cup, it is possible you might get oz, but it is also possible that you might not. It is difficult to say unless you try it, but it is actually best to weigh it instead. Also what you have to bear in mind is how tightly you pack it in. This may seem an over analysed answer, but if the question were asked in reference to some diet fad, it would be crucial to get it right.

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15y ago

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