Arby’s Crispy Fish Sandwich is not a particularly healthy fast food option. At 570 calories, 25 grams of fat, and nearly 1,000 milligrams of sodium, it lands on the heavier end of the fast food fish sandwich spectrum. The fish itself, wild-caught Alaskan pollock, is a lean, nutritious protein source, but the breading, frying oil, and tartar sauce add enough calories, fat, and sodium to offset most of those benefits.
Nutrition at a Glance
The standard Arby’s Crispy Fish Sandwich delivers 570 calories, 25 grams of fat, 65 grams of carbohydrates, and 20 grams of protein. That calorie count represents roughly a quarter to a third of most adults’ daily needs in a single sandwich, without fries or a drink. The 65 grams of carbs come from the breading on the fish and the bun together, putting this sandwich closer to a pasta dish than what most people picture when they think “fish.”
The sodium is the standout concern. At 995 milligrams, one sandwich accounts for 43% of the FDA’s recommended daily limit of 2,300 milligrams. Add a medium order of curly fries and you’re likely past the full day’s worth. High sodium intake is strongly linked to elevated blood pressure over time, so this matters if you’re watching your cardiovascular health or eating fast food regularly.
How It Compares to McDonald’s Filet-O-Fish
The McDonald’s Filet-O-Fish is the most common benchmark for fast food fish, and the differences are significant. McDonald’s version comes in at 390 calories, 19 grams of fat, 39 grams of carbs, and 580 milligrams of sodium. That’s roughly 180 fewer calories, 26 fewer grams of carbs, and 400 milligrams less sodium than Arby’s. McDonald’s sandwich is also smaller, which explains part of the gap, but the per-sandwich comparison still matters if you’re choosing between the two.
Protein is close: 16 grams for McDonald’s versus 20 grams for Arby’s. So you’re getting a modest protein boost at Arby’s, but paying for it with substantially more calories and sodium.
The King’s Hawaiian Version Is Worse
If you’re eyeing the King’s Hawaiian Fish Deluxe, know that it jumps to 690 calories, 34 grams of fat, 74 grams of carbs, and 19 grams of sugar. That sugar count is notable. The sweet Hawaiian bun and deluxe toppings nearly double the sugar compared to the standard version’s 9 grams. This puts the sandwich in the calorie range of many full meals, and pairing it with sides can push a single fast food stop past 1,000 calories easily.
What Happens to Fish When It’s Fried
Alaskan pollock on its own is a solid nutritional choice. It’s low in fat, high in protein, and naturally contains omega-3 fatty acids (the type linked to heart and brain health). But frying changes the picture in two important ways.
First, the breading absorbs oil during cooking, which dramatically increases the fat content. Research on fried fish fillets shows that frying raises the fat content from about 15% to over 21% by weight, while moisture drops significantly. The fish essentially swaps water for oil. Second, frying reduces the levels of beneficial omega-3s like EPA and DHA. The high heat and oil exchange alter the fat profile of the fish, so you lose much of the nutritional advantage that makes fish a recommended protein in the first place.
Arby’s uses a blend of corn oil, soybean oil, canola oil, and hydrogenated soybean oil in its fryers. The inclusion of hydrogenated soybean oil is worth noting because hydrogenation is the process that creates trans fats. While modern food manufacturing has reduced trans fat levels significantly, hydrogenated oils can still contain trace amounts. The fryer blend also includes dimethylpolysiloxane, an anti-foaming additive that’s common across fast food chains and generally considered safe.
Where the Calories Really Come From
It helps to break down where this sandwich gets its nutritional baggage. The pollock fillet itself, before breading and frying, would contribute roughly 80 to 100 calories and very little fat. The rest of the 570-calorie total comes from three sources: the thick breading that coats the fillet and soaks up frying oil, the bun (which accounts for a large share of those 65 carb grams), and the tartar sauce, which is typically a mayonnaise-based condiment high in fat and sodium.
If your goal is getting the health benefits of eating fish, a fast food fried fish sandwich is one of the least efficient ways to do it. You’re eating a significant amount of refined carbohydrates and added fat to get 20 grams of protein from a fish that’s lost most of its omega-3 content in the fryer. A plain grilled fish option, when available at other chains, typically cuts calories by 30 to 40% and preserves more of the beneficial fats.
Making It Work if You Still Want It
If you enjoy Arby’s fish sandwich and want to fit it into a reasonable day of eating, there are a few practical moves. Skip the fries and pair the sandwich with a side salad or apple slices if available. That keeps the meal closer to 600 calories instead of 900 or more. Choose the standard version over the King’s Hawaiian Deluxe to save 120 calories and cut your sugar intake in half. You can also ask for the sandwich without tartar sauce, which removes a concentrated source of both fat and sodium.
As an occasional meal, the Crispy Fish Sandwich isn’t going to derail an otherwise balanced diet. The concern is more about frequency. If you’re eating fried fish sandwiches multiple times a week during Lent or fish sandwich season, the sodium alone (nearly 1,000 milligrams per sandwich) adds up quickly. Treating it as a once-in-a-while choice rather than a regular lunch keeps the impact manageable.