McDonald's Big Mac Calories & Carbs
Last updated September 8, 2026 · Compiled by the CarbMeNot Team
Values per 1 burger (213g); per 100 g: 19.7g net carbs, 258 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 big mac?
McDonald's Big Mac — 1 burger (213g) — has 42g net carbs: 44.9g total carbs minus 3g fiber, plus 24.9g protein, 30g fat, and 550 calories. Per 100g that is 19.7g net carbs (21.1g total carbs, 1.4g fiber) and 258 calories. That makes mcdonald's big mac moderate 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 big mac 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 big mac keto-friendly?
McDonald's Big Mac is generally not keto-friendly. 1 burger (213g) is 42g net carbs (44.9g total carbs − 3g fiber); per 100g that is 19.7g 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 big mac?
McDonald's 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.
Carbs by serving size
| Serving | Net carbs | Total carbs | Protein | Calories |
|---|---|---|---|---|
| 1 burger | 42g | 44.9g | 24.9g | 550 |
| 100 g (3.5 oz) | 19.7g | 21.1g | 11.7g | 258 |
| 1 oz (28 g) | 5.5g | 5.9g | 3.3g | 72 |
How many calories are in mcdonald's big mac?
McDonald's Big Mac — 1 burger (213g) — has 550 calories, with 24.9g protein, 30g fat, and 42g net carbs. Per 100g: 258 calories and 19.7g net carbs.
Nutrition facts
| Nutrient | Amount (per 100 g) |
|---|---|
| Calories | 258 |
| Total carbs | 21.1g |
| Net carbs | 19.7g |
| Fiber | 1.4g |
| Sugar | 4.2g |
| Sugar alcohols | 0g |
| Protein | 11.7g |
| Fat | 14.1g |
| Sodium | 474mg |
| Potassium | 0mg |
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 big mac?
- McDonald's Big Mac (1 burger, 213g) has 44.9g of total carbs and 42g of net carbs. Per 100 grams: 21.1g total, 19.7g net.
- How many net carbs are in mcdonald's big mac?
- McDonald's Big Mac has 42g of net carbs per 1 burger (213g) — 44.9g total carbs minus 3g fiber.
- Is mcdonald's big mac keto-friendly?
- McDonald's Big Mac is generally not keto-friendly. 1 burger (213g) is 42g net carbs (44.9g total carbs − 3g fiber); per 100g that is 19.7g 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 big mac?
- McDonald's Big Mac (1 burger, 213g) has 550 calories; that is 258 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.