What size is a regular can of tuna?
                                
                                
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                                    4 min read                                
                            
                                Historically, the 'regular' size for a can of tuna has changed over the years, decreasing from seven ounces to six, and finally settling on the five-ounce standard most consumers are familiar with today.  The question of what size is a regular can of tuna depends on this modern industry standard, which reflects a shift towards single-serving convenience for consumers.