Carbs in Mcdonalds Big Fries
How many carbs are in mcdonalds big fries?
Mcdonalds Big Fries has 37g net carbs per 100g — 37g total carbs minus 0g fiber — plus 3.4g protein, 22g fat, and 448 calories. That makes mcdonalds big fries high in net carbs and higher than the typical fast-food item, which averages about 26.5g net carbs per 100g. At this carb count, mcdonalds big fries is best limited to small portions on keto (usually 20–50g net carbs per day). Values are per per 100 g, sourced from Open Food Facts; net carbs are computed by CarbMeNot.
Keeping an eye on carbs in mcdonalds big fries?
Mcdonalds Big Fries runs higher in carbs, so portions matter. CarbMeNot tracks every gram from a photo, so you stay under your daily limit without the math.
Last updated June 10, 2026 · Reviewed by Jordan Lee, Nutrition Editor
Values per 100 g.
Is mcdonalds big fries keto-friendly?
Mcdonalds Big Fries is generally not keto-friendly. It has 37g net carbs per 100g (37g total carbs − 0g fiber). 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.
Carbs by serving size
| Serving | Net carbs | Total carbs | Protein | Calories |
|---|---|---|---|---|
| 100 g (3.5 oz) | 37g | 37g | 3.4g | 448 |
| 1 oz (28 g) | 10.4g | 10.4g | 1g | 125 |
How many calories are in mcdonalds big fries?
Mcdonalds Big Fries has 448 calories per 100g. That's alongside 3.4g protein, 22g fat, and 37g net carbs per 100g.
Nutrition facts
| Nutrient | Amount (per 100 g) |
|---|---|
| Calories | 448 |
| Total carbs | 37g |
| Net carbs | 37g |
| Fiber | 0g |
| Sugar | 0.5g |
| Sugar alcohols | 0g |
| Protein | 3.4g |
| Fat | 22g |
| Sodium | 288mg |
| Potassium | 0mg |
Source: Open Food Facts (McDonald'sMcCain). Net carbs = total carbs − fiber − sugar alcohols, computed by CarbMeNot.
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Frequently asked questions
- How many carbs are in mcdonalds big fries?
- Mcdonalds Big Fries has 37g of total carbs and 37g of net carbs per 100 grams.
- How many net carbs are in mcdonalds big fries?
- Mcdonalds Big Fries has 37g of net carbs per 100 grams (total carbs 37g minus 0g fiber).
- Is mcdonalds big fries keto-friendly?
- Mcdonalds Big Fries is generally not keto-friendly. It has 37g net carbs per 100g (37g total carbs − 0g fiber). 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 mcdonalds big fries?
- Mcdonalds Big Fries has 448 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.