Carbs in Mac and Cheese: The Quick Answer
Mac and Cheese contains 20.8g of net carbs per 100g, calculated by subtracting 0.7g of dietary fiber from 21.5g of total carbohydrates. With 181 calories, 6.6g protein, and 7.7g fat per 100g, it is classified as High Carbs for carbohydrate content.
Net carbs — not total carbs — are what matter for keto and low-carb diets. Only net carbs raise blood sugar and affect insulin, which is why tracking them accurately is key to staying in ketosis. Use our Keto Macro Calculator to find your daily net carb limit based on your body and goals.
Is Mac and Cheese Keto Friendly?
Mac and Cheese is high in carbs with 20.8g net carbs per 100g. It is generally not suitable for strict keto (under 20g net carbs/day) but may fit into a broader low-carb diet depending on portion size and your daily limit.
Make It Keto: Mac and Cheese
You don't have to skip Mac and Cheese on a low-carb diet — you just need to know what to order (and what to skip).
| When ordering | Make it keto | Carb savings |
|---|---|---|
| Mac and cheese (~21g net carbs per 100g) | Cauliflower mac and cheese | Steam cauliflower florets, top with the same cheese sauce — ~4g net carbs |
| Boxed mac and cheese | Shirataki mac and cheese (shirataki noodles + homemade cheese sauce) | Near-zero carb noodles + full-fat cheddar sauce |
| Baked mac and cheese | Cauliflower gratin (cauli + gruyère + cream + breadcrumb substitute: pork rinds) | Rich, bubbly, golden — ~5g net carbs |
How Net Carbs Are Calculated
Net carbs are calculated by subtracting dietary fiber (and sugar alcohols, if present) from total carbohydrates: Net Carbs = Total Carbs − Fiber. For Mac and Cheese: 21.5g − 0.7g = 20.8g net carbs per 100g.
Dietary fiber is subtracted because it passes through the digestive system without being absorbed as glucose. It does not raise blood sugar or trigger an insulin response, making it irrelevant for carb counting on keto and low-carb diets.