McDonald's Filet-O-Fish Calories & Carbs
Last updated September 8, 2026 · Compiled by the CarbMeNot Team
Values per 1 sandwich (142g); per 100 g: 26.8g net carbs, 275 cal. Net carbs = total carbs − fiber − sugar alcohols — do the math for any label with the free net carbs calculator.
How many carbs are in mcdonald's filet-o-fish?
McDonald's Filet-O-Fish — 1 sandwich (142g) — has 38.1g net carbs: 39.1g total carbs minus 1g fiber, plus 15.1g protein, 19g fat, and 391 calories. Per 100g that is 26.8g net carbs (27.5g total carbs, 0.7g fiber) and 275 calories. That makes mcdonald's filet-o-fish high in net carbs and about average for the typical fast-food item, which averages about 26.2g net carbs per 100g. At this carb count, mcdonald's filet-o-fish is best limited to small portions on keto (usually 20–50g net carbs per day). Values are per 100 g, sourced from Manufacturer-reported values; net carbs are computed by CarbMeNot.
Is mcdonald's filet-o-fish keto-friendly?
McDonald's Filet-O-Fish is generally not keto-friendly. 1 sandwich (142g) is 38.1g net carbs (39.1g total carbs − 1g fiber); per 100g that is 26.8g net carbs. On a standard keto diet (20–50g net carbs per day), even one serving uses a large share of your daily carbs, so keep portions small or save it for a higher-carb day.
Keeping an eye on carbs in mcdonald's filet-o-fish?
McDonald's Filet-O-Fish runs higher in carbs, so portions matter. CarbMeNot tracks every gram from a photo, so you stay under your daily limit without the math.
Carbs by serving size
| Serving | Net carbs | Total carbs | Protein | Calories |
|---|---|---|---|---|
| 1 sandwich | 38.1g | 39.1g | 15.1g | 391 |
| 100 g (3.5 oz) | 26.8g | 27.5g | 10.6g | 275 |
| 1 oz (28 g) | 7.5g | 7.7g | 3g | 77 |
How many calories are in mcdonald's filet-o-fish?
McDonald's Filet-O-Fish — 1 sandwich (142g) — has 391 calories, with 15.1g protein, 19g fat, and 38.1g net carbs. Per 100g: 275 calories and 26.8g net carbs.
Nutrition facts
| Nutrient | Amount (per 100 g) |
|---|---|
| Calories | 275 |
| Total carbs | 27.5g |
| Net carbs | 26.8g |
| Fiber | 0.7g |
| Sugar | 3.5g |
| Sugar alcohols | 0g |
| Protein | 10.6g |
| Fat | 13.4g |
| Sodium | 416mg |
| Potassium | 141mg |
Source: Manufacturer-reported values (fast-food). Net carbs = total carbs − fiber − sugar alcohols, computed by CarbMeNot.
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Frequently asked questions
- How many carbs are in mcdonald's filet-o-fish?
- McDonald's Filet-O-Fish (1 sandwich, 142g) has 39.1g of total carbs and 38.1g of net carbs. Per 100 grams: 27.5g total, 26.8g net.
- How many net carbs are in mcdonald's filet-o-fish?
- McDonald's Filet-O-Fish has 38.1g of net carbs per 1 sandwich (142g) — 39.1g total carbs minus 1g fiber.
- Is mcdonald's filet-o-fish keto-friendly?
- McDonald's Filet-O-Fish is generally not keto-friendly. 1 sandwich (142g) is 38.1g net carbs (39.1g total carbs − 1g fiber); per 100g that is 26.8g net carbs. On a standard keto diet (20–50g net carbs per day), even one serving uses a large share of your daily carbs, so keep portions small or save it for a higher-carb day.
- How many calories are in mcdonald's filet-o-fish?
- McDonald's Filet-O-Fish (1 sandwich, 142g) has 391 calories; that is 275 calories per 100 grams.
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CarbMeNot provides general nutrition information, not medical advice. Values are estimates — verify before relying on them for any health decision. See our Medical Disclaimer.