How many carbs are in a McDonald's Filet-O-Fish?
A 1 sandwich (139g) serving of McDonald's Filet-O-Fish contains 38g of total carbs (36g net carbs), 5g sugar, 380 calories, 16g protein, 18g fat and 2g fiber.
- Calories
- 380 cal
- Carbohydrates
- 38 g
- of which Sugars
- 5 g
- Fiber
- 2 g
- Net carbs
- 36 g
- Protein
- 16 g
- Fat
- 18 g
McDonald's Filet-O-Fish nutrition at a glance
Per 1 sandwich (139g), McDonald's Filet-O-Fish delivers about 19% of a 2,000-calorie daily reference, 14% of the 275g daily carbohydrate reference and 7% of the 28g daily fiber reference. Sugar sits at 10% of the 50g added-sugar reference and protein contributes 32% of the 50g protein reference.
- Calories
- 273
- Carbs
- 27.3 g
- Sugar
- 3.6 g
- Protein
- 11.5 g
- Fat
- 12.9 g
- Fiber
- 1.4 g
Blood-sugar impact of McDonald's Filet-O-Fish
Moderate glycemic impact expected. If you're monitoring blood sugar, keep an eye on total portion size and combine with protein or fat.
With 38g total carbs and 2g fiber, the net-carb figure for a 1 sandwich (139g) serving works out to roughly 36g — this is the number most keto and low-carb tracking apps use. If you're managing type 2 diabetes, pre-diabetes or reactive hypoglycemia, use total carbs for insulin dosing calculations and treat net carbs as a rough guide for meal planning.
Ways to eat McDonald's Filet-O-Fish
- Treat mcdonald's filet-o-fish as your main carb source for the meal — skip additional bread, rice or pasta on the side.
- Split a full serving of mcdonald's filet-o-fish into two smaller portions to keep post-meal glucose steadier.
- Pair mcdonald's filet-o-fish with 20–30g of protein and some healthy fat to flatten the blood-sugar response.
Frequently asked questions
Is McDonald's Filet-O-Fish keto-friendly?
Not really. 36g net carbs per 1 sandwich (139g) exceeds a full-day keto allowance for most people. It's a much better fit for a low-carb (100–150g/day) or balanced plan.
How many carbs in McDonald's Filet-O-Fish per 100 grams?
About 27.3g of carbs, 3.6g sugar and 273 calories per 100g of McDonald's Filet-O-Fish.
How does McDonald's Filet-O-Fish affect blood sugar?
Moderate glycemic impact expected. If you're monitoring blood sugar, keep an eye on total portion size and combine with protein or fat.
Is McDonald's Filet-O-Fish good for weight loss?
A serving delivers 380 calories with 16g protein and 2g fiber. Foods that are relatively high in protein and fiber per calorie tend to be more filling — with a 5% combined protein-plus-fiber-to-calorie ratio, McDonald's Filet-O-Fish is best paired with a lean protein or vegetables so the meal keeps you full for longer.
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Open scannerSources & how these numbers are calculated
Nutrition values are consensus averages compiled from the USDA FoodData Central database for a typical 1 sandwich (139g) serving of McDonald's Filet-O-Fish. Actual values vary with brand, variety, ripeness and preparation — always check the label on packaged products. Daily-value percentages reference the U.S. FDA 2,000-calorie adult reference (275g carbs, 50g added sugar, 50g protein, 78g fat, 28g fiber).
Content reviewed by Carb Lens editorial. Read our editorial policy for how we source, review and update food data.