How many calories are in chicken mayonnaise and jacket potato?

The calories in jacket potato with tuna mayo are determined by the size of the potato, the amount of tuna and the amount of mayonnaise. For the calories in baked/jacket potato and the calories in tuna (both fresh and canned tuna) please see the page links, further down this page, listed under Related Questions. Alternatively, please feel free to ask the question again and include more detail.