Cheese is not just allowed on keto. It is one of the foods the diet is built on: mostly fat, a solid dose of protein, and almost no carbohydrate, because the bacteria that make cheese eat the lactose that makes milk sweet. An ounce of cheddar has under a gram of net carbs and 9 g of fat. You could eat a quarter pound and spend 4 g of carbs.
Under the Pure Keto™ Standard, cheddar scores Pure Keto, and so does nearly every aged, hard or soft-ripened cheese in the case. The handful that score lower are the ones with the fat removed (low-fat and fat-free cheeses), the fresh cheeses that keep some lactose (cottage cheese, ricotta), and processed cheese products with added milk solids. This guide scores 25 common cheeses, tells you which to reach for, and gives an honest answer on how much is too much.
The Pure Keto™ score for cheese
The score box above is for an ounce of cheddar: 114 calories, 9.4 g fat, 6.5 g protein and 0.9 g of carbohydrate. By calories that is about 74 percent fat, 23 percent protein and 3 percent net carbs. The Pure Keto zone requires 60 percent fat and no more than 10 percent carbs; cheddar clears both by a mile. There is no fiber and no sugar alcohol in cheese, so under the Pure Keto Net Carb Standard total carbs and net carbs are the same.
Here is how 25 cheeses compare per ounce (28 g), which is roughly a one-inch cube or a slice:
| Cheese (1 oz) | Fat | Protein | Net carbs | Pure Keto zone |
|---|---|---|---|---|
| Cream cheese | 10 g | 2 g | 1.2 g | Pure Keto |
| Mascarpone | 13 g | 1 g | 1 g | Pure Keto |
| Brie | 8 g | 6 g | 0.1 g | Pure Keto |
| Camembert | 7 g | 6 g | 0.1 g | Pure Keto |
| Goat cheese, soft | 6 g | 5 g | 0 g | Pure Keto |
| Blue cheese | 8 g | 6 g | 0.7 g | Pure Keto |
| Gorgonzola | 8 g | 6 g | 0.7 g | Pure Keto |
| Cheddar | 9.4 g | 6.5 g | 0.9 g | Pure Keto |
| Gouda | 8 g | 7 g | 0.6 g | Pure Keto |
| Gruyere | 9 g | 8 g | 0.1 g | Pure Keto |
| Havarti | 10 g | 6 g | 0.5 g | Pure Keto |
| Monterey Jack | 8.5 g | 7 g | 0.2 g | Pure Keto |
| Colby | 9 g | 7 g | 0.7 g | Pure Keto |
| Pepper Jack | 8 g | 7 g | 0.5 g | Pure Keto |
| Provolone | 7.5 g | 7 g | 0.6 g | Pure Keto |
| Swiss | 8.8 g | 7.6 g | 1.5 g | Pure Keto |
| Feta | 6 g | 4 g | 1.1 g | Pure Keto |
| Mozzarella, whole milk | 6.3 g | 6.3 g | 0.6 g | Pure Keto |
| Parmesan | 7.3 g | 10 g | 0.9 g | Pure Keto |
| Ricotta, whole milk (1/4 cup) | 8 g | 7 g | 2 g | Pure Keto |
| String cheese, part-skim (1 stick) | 6 g | 7 g | 1 g | Pure Keto |
| Babybel Original (1 round) | 5 g | 5 g | 0 g | Pure Keto |
| Mozzarella, part-skim | 4.5 g | 7 g | 0.8 g | Keto Friendly |
| American, Kraft Single (1 slice) | 4 g | 3 g | 2 g | Keto Friendly |
| Cottage cheese, 4% (1/2 cup) | 5 g | 12 g | 4 g | Keto Friendly |
| Cottage cheese, 2% (1/2 cup) | 2.5 g | 12 g | 5 g | Low Carb |
| Fat-free cheddar or mozzarella | 0 g | 9 g | 1 g | Low Carb |
| Velveeta | 6 g | 4 g | 3 g | Keto Friendly |
Two takeaways. Aged cheese has almost no carbs, because aging is fermentation and fermentation eats sugar. And the only way to make cheese score badly is to take the fat out of it.
Why almost all cheese scores Pure Keto
Cheese starts as milk, which is about 30 percent carbohydrate by calories and scores Low Carb (see our milk guide). Making cheese removes the water and most of the lactose in the whey, and the cultures consume most of what is left. What remains is milk fat and casein protein. The longer a cheese ages, the less lactose survives: aged cheddar, parmesan and gruyere are effectively lactose-free, which is why they show up at 0 to 1 g per ounce and why many lactose-intolerant people tolerate them.
Fresh cheeses keep more. Cottage cheese and ricotta are barely fermented and hold on to 2 to 5 g of lactose per serving. Cottage cheese has the added problem of being mostly protein, which is why the 4% version scores Keto Friendly and the 2% version drops to Low Carb; see our cottage cheese guide.
Processed cheese is the other exception. American singles and Velveeta are cheese blended with milk solids, whey and emulsifying salts, which adds 2 to 3 g of carbs per serving. They will not end ketosis, but they score Keto Friendly rather than Pure Keto, and real cheese is better on every count.
How much cheese fits on keto
Carbohydrate is not the constraint. At under 1 g per ounce, cheese would need to be eaten by the half pound to matter. The constraints are:
- Calories. Cheese is 100 to 120 calories per ounce. Three to four ounces a day is 350 to 450 calories, a reasonable share of a day. Eight ounces is 900, and that is where "I eat keto but I am not losing weight" often comes from.
- Portioning. Grazing from a block or a bag of shredded cheese is the problem, not cheese. Slice an ounce, or buy pre-portioned formats: string cheese, Babybel, one-ounce slices.
- Protein balance. Parmesan and part-skim mozzarella are high in protein relative to fat. That is fine, but if you are building a meal from lean protein plus a lot of parmesan, add fat elsewhere.
- Salt. Feta, parmesan, blue and processed cheese are high in sodium. On keto that is usually a benefit, not a problem.
A practical daily pattern: an ounce on eggs at breakfast, an ounce as a snack, and one to two ounces melted into dinner. That is Pure Keto all day.
Cheeses people ask about
- Babybel: Original scores Pure Keto at 0 g carbs. Light scores Keto Friendly. Every Mini Babybel flavor (cheddar, gouda, light, mozzarella) is 0 g carbs per round.
- String cheese: part-skim mozzarella sticks score Pure Keto at about 63 percent fat. Whole-milk sticks (Frigo Cheese Heads whole milk, Organic Valley) score higher. "Light" sticks score Keto Friendly.
- Cream cheese: Pure Keto at about 88 percent fat. Full-fat only; whipped and light versions add carbs and drop the fat. See our cream cheese guide.
- Cottage cheese: 4% scores Keto Friendly, 2% and fat-free score Low Carb. Eat the full-fat version and add fat.
- Shredded cheese: the same as block cheese plus a dusting of potato starch or cellulose to stop clumping, which adds up to 1 g of carbs per cup. Fine. Shred your own if you want the melt to be better.
- Goat cheese and sheep cheese (feta, manchego, pecorino): all Pure Keto. Manchego is about 0.1 g per ounce.
- Cheese spreads and flavored cream cheeses: check labels. Port wine cheese spread, fruit-flavored cream cheese and cheese balls rolled in dried fruit add sugar. Herb and garlic versions are usually fine.
- Cheese crisps (Whisps, Moon Cheese, homemade parmesan crisps): baked cheese, so Pure Keto. The best keto answer to chips and popcorn.
- Cheese sauces and queso: homemade with cheese, cream and butter, Pure Keto. Jarred queso and nacho sauce add starch and sugar and run 3 to 6 g net carbs per quarter cup.
- Vegan cheese: most are built on starch (tapioca, potato) with coconut oil and carry 5 to 8 g net carbs per ounce. Not keto. Nut-based vegan cheeses (cashew) are lower but still 2 to 4 g.
- Cheese on carnivore: aged cheese is widely included on relaxed carnivore plans. Purists skip dairy.
The best keto ways to eat cheese
- Melted over vegetables. Broccoli, cauliflower, spinach or cabbage with cheddar or gruyere melted on top turns a Low Carb vegetable into a Pure Keto side.
- Cheese crisps and taco shells. Bake shredded cheddar or parmesan in rounds until golden; drape over a spoon handle to make taco shells.
- Fathead dough. Mozzarella and cream cheese melted with almond flour and egg. The base for keto pizza, bagels and rolls.
- Cheese and charcuterie. Brie, gouda, salami and olives. A meal with almost no carbs.
- Omelets and frittatas. Any cheese, with bacon or Spam, scores Pure Keto.
- Stuffed peppers and mushrooms. Cream cheese, cheddar and sausage.
- Cauliflower mac and cheese. Cauliflower florets in a sauce of heavy cream, cream cheese and sharp cheddar. About 6 g net carbs per cup.
- Snacks. A Babybel, a string cheese, or a slice of cheddar with a few macadamias is the easiest Pure Keto snack there is.
The bottom line
Cheese is keto friendly, and most of it scores Pure Keto under the Pure Keto Standard: cheddar, mozzarella, brie, gouda, parmesan, feta, blue, goat and cream cheese all have around 1 g net carbs per ounce or less with 60 to 90 percent of calories from fat. Skip the low-fat versions, treat processed cheese as second-best, and watch the total ounces rather than the carbs.
Sources
- U.S. Department of Agriculture, FoodData Central. Cheese, cheddar (SR Legacy 173414); Cheese, mozzarella, whole milk (SR Legacy 173417); Cheese, mozzarella, part skim (SR Legacy 170845); Cheese, parmesan, hard (SR Legacy 170848); Cheese, brie (SR Legacy 172177); Cheese, feta (SR Legacy 173420); Cheese, blue (SR Legacy 172176); Cheese, swiss (SR Legacy 171251); Cheese, cottage, creamed, large or small curd (SR Legacy 172192); Cheese, cream (SR Legacy 173418); Cheese, pasteurized process, American (SR Legacy 171245).
- Manufacturer nutrition panels for Babybel Original and Light, Kraft Singles, Velveeta, Frigo Cheese Heads and Whisps, accessed September 2026.
Frequently asked questions
Is cheese keto friendly?
Yes. Most cheese scores Pure Keto under the Pure Keto Standard: cheddar, mozzarella, brie, gouda, parmesan, feta, blue and cream cheese all have under 1 g net carbs per ounce with 60 to 90 percent of calories from fat. The exceptions are low-fat cheeses, processed cheese products and cottage cheese, which score Keto Friendly or Low Carb.
Which cheese is lowest in carbs?
Hard aged cheeses. Parmesan, aged cheddar, gouda, gruyere, brie and goat cheese are all at or under 1 g of net carbs per ounce, and aged cheddar and brie are close to zero, because the bacteria consume the lactose during aging. Fresh cheeses like ricotta and cottage cheese keep more lactose, at 1 to 4 g per serving.
How much cheese can I eat on keto?
Carbs are not the limit; at under 1 g per ounce you could eat a quarter pound for 4 g. Calories are: an ounce is about 100 to 120 calories, so 3 to 4 ounces a day, roughly 350 to 450 calories, is a sensible ceiling for most people. Cheese is also easy to overeat, so slice it rather than grazing from the block.
Is Babybel keto?
Yes. A Babybel Original has 70 calories, 5 g fat, 5 g protein and 0 g carbs, which scores Pure Keto. Babybel Light drops to 3 g of fat and scores Keto Friendly. Mini Babybel cheddar and gouda varieties are all 0 g carbs. They are one of the most convenient Pure Keto snacks sold.
Is string cheese keto?
Yes. A standard part-skim mozzarella string cheese stick has about 80 calories, 6 g fat, 7 g protein and 1 g carbs, which is roughly 63 percent fat and scores Pure Keto. Whole-milk string cheese scores higher still. Light string cheese, at about 2.5 g fat, scores Keto Friendly.
Is American cheese keto?
A Kraft Single has about 60 calories, 4 g fat, 3 g protein and 2 g carbs per slice, which scores Keto Friendly, not Pure Keto, because the carbs from milk solids and emulsifiers push it just past the 10 percent line. Deli-sliced American cheese is usually lower in carbs, around 1 g per slice, and scores Pure Keto. Velveeta has about 3 g per ounce.
