Burger King’s Big Fish sandwich comes in at 515 calories with 28 grams of fat and over 1,100 milligrams of sodium, making it a moderate-to-heavy meal by fast food standards. It’s not the worst thing on the menu, but calling it “healthy” would be a stretch.
Full Nutritional Breakdown
The Big Fish sandwich packs 515 calories into a relatively simple build: a breaded pollock fillet, tartar sauce, and a brioche-style bun. Here’s what you’re getting:
- Calories: 515
- Total fat: 28 g
- Saturated fat: 4.7 g
- Carbohydrates: 51 g
- Fiber: 2 g
- Sugar: 7 g
- Protein: 16 g
- Sodium: 1,181 mg
For context, 515 calories is comparable to a Whopper Jr. with cheese or two smaller burgers. The issue isn’t just the calorie count. It’s where those calories come from. Nearly half the calories (252 of them) come from fat, largely due to the deep-fried breading and the oil-based tartar sauce. Meanwhile, protein sits at just 16 grams, which is low for a sandwich this calorie-dense. A grilled chicken sandwich at the same calorie level would typically deliver 25 to 30 grams of protein.
The Sodium Problem
The single biggest red flag is sodium. At 1,181 milligrams, the Big Fish sandwich delivers roughly 51% of the FDA’s recommended daily limit of 2,300 milligrams in one sitting. That’s before you add fries, a drink, or any condiments. If you pair it with a medium order of fries (adding another 570 or so milligrams), you’re approaching 75% of your entire day’s sodium budget in one meal.
High sodium intake is linked to elevated blood pressure, increased risk of heart disease, and fluid retention. If you’re watching your salt intake for any reason, this sandwich is one of the harder options to fit into your day.
What’s Actually in the Sandwich
The fish itself is pollock, a mild white fish that’s widely used in fast food fish sandwiches and frozen fish sticks. On its own, pollock is a lean, low-calorie protein source. It’s not a bad choice nutritionally. The problem is what happens to it before it reaches the bun.
The fillet is coated in a breading made from toasted wheat crumbs, corn starch, corn flour, soybean oil, and various seasonings. Deep frying this breading adds a significant amount of fat and calories that wouldn’t be there with a grilled or baked preparation. The tartar sauce is built on a base of soybean oil, sweet relish (which contains high fructose corn syrup), egg yolk, sugar, and a long list of preservatives. It’s essentially flavored mayonnaise with sweetened pickle relish mixed in, and it contributes both fat and sodium to the total.
The brioche-style bun accounts for a large chunk of the 51 grams of carbohydrates. With only 2 grams of fiber in the entire sandwich, those carbs are mostly refined, meaning they’ll spike your blood sugar faster than a whole-grain alternative would.
How It Compares to Other Menu Items
The Big Fish isn’t the heaviest item at Burger King. A standard Whopper runs about 660 calories with 40 grams of fat, so the fish sandwich looks better by comparison. But it compares poorly to a grilled chicken option or even a plain hamburger, which typically comes in under 300 calories with less sodium and more protein per calorie.
If you’re choosing the fish sandwich because you think fish is automatically the healthier choice, that logic breaks down once the fillet is breaded and fried. The cooking method and the sauce undo most of the natural advantages of choosing fish over beef. You’d get more protein and fewer empty calories from a basic burger with no mayo.
Making It Slightly Better
If you genuinely enjoy the Big Fish and want to trim the damage, your best move is skipping the tartar sauce. That alone can cut around 100 calories and a noticeable portion of the fat and sodium. You could ask for mustard or ketchup instead, both of which are far lower in calories, though ketchup does add some sugar.
Ordering the sandwich without the bun is another option if you’re trying to reduce carbs, though you’ll lose the structural experience of eating a sandwich. Pairing it with a side salad instead of fries keeps the total meal from ballooning past 700 or 800 calories.
Allergens to Know About
The Big Fish contains five major allergens: fish (pollock), wheat (in the breading and bun), eggs (in the tartar sauce), soy (in the breading oil and sauce), and milk (in the tartar sauce and bun). If you have sensitivities to any of these, this sandwich is one to avoid. Cross-contamination is also a factor in any fast food kitchen where the same fryers are used for multiple items.