Carbs in Big Mac
How many carbs are in big mac?
Big Mac has 16.5g net carbs per 100g — 18.1g total carbs minus 1.6g fiber — plus 11.6g protein, 11.6g fat, and 228 calories. That makes big mac moderate in net carbs and lower than the typical fast-food item, which averages about 26.5g net carbs per 100g. At this carb count, big mac 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.
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Big Mac 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 big mac keto-friendly?
Big Mac is borderline for keto — it works only in small portions. It has 16.5g net carbs per 100g (18.1g total carbs − 1.6g 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) | 16.5g | 18.1g | 11.6g | 228 |
| 1 oz (28 g) | 4.6g | 5.1g | 3.2g | 64 |
How many calories are in big mac?
Big Mac has 228 calories per 100g. That's alongside 11.6g protein, 11.6g fat, and 16.5g net carbs per 100g.
Nutrition facts
| Nutrient | Amount (per 100 g) |
|---|---|
| Calories | 228 |
| Total carbs | 18.1g |
| Net carbs | 16.5g |
| Fiber | 1.6g |
| Sugar | 3.4g |
| Sugar alcohols | 0g |
| Protein | 11.6g |
| Fat | 11.6g |
| Sodium | 397mg |
| Potassium | 0mg |
Source: Open Food Facts (McDonald's). Net carbs = total carbs − fiber − sugar alcohols, computed by CarbMeNot.
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Frequently asked questions
- How many carbs are in big mac?
- Big Mac has 18.1g of total carbs and 16.5g of net carbs per 100 grams.
- How many net carbs are in big mac?
- Big Mac has 16.5g of net carbs per 100 grams (total carbs 18.1g minus 1.6g fiber).
- Is big mac keto-friendly?
- Big Mac is borderline for keto — it works only in small portions. It has 16.5g net carbs per 100g (18.1g total carbs − 1.6g 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 big mac?
- Big Mac has 228 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.