Can of Drained Tuna Have Calories? Unpacking the Nutritional Facts
                                
                                
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                                    4 min read                                
                            
                                According to the USDA, a 5-ounce can of drained tuna in oil has roughly 317 calories, while a 5-ounce can packed in water, drained, has about 150 calories. While draining significantly reduces the calorie content, a can of drained tuna have calories because the fish itself is a calorie source, primarily from its protein and fat content. The packing liquid—water or oil—is the main factor influencing the final calorie count after draining.