Blue cheese dressing is one of the most keto-friendly dressings you can pick. A standard two-tablespoon serving contains roughly 1 to 2 grams of net carbs and over 16 grams of fat, making it an easy fit for a ketogenic diet as long as your total daily carbs stay at or below 30 grams.
Carbs and Fat per Serving
A one-ounce serving (about two tablespoons) of blue cheese dressing typically delivers 0.9 to 2 grams of net carbs, zero fiber, and around 16 to 17 grams of fat. That fat-to-carb ratio is almost ideal for keto. By comparison, many other creamy dressings like Thousand Island or honey mustard can pack 5 to 10 grams of carbs in the same serving size.
The blue cheese itself contributes to the favorable numbers. One ounce of blue cheese contains less than 1 gram of carbohydrates, 8 grams of fat, and 6 grams of protein. It also supplies 150 mg of calcium per ounce, along with phosphorus, selenium, and riboflavin. So the cheese crumbles in the dressing aren’t just flavor; they’re adding useful nutrients without any meaningful carb load.
What to Watch in Store-Bought Brands
Not every bottle on the shelf is identical. The carb count depends on what the manufacturer adds beyond cheese, oil, and vinegar. Marzetti’s Chunky Blue Cheese, for example, lists sugar as an ingredient and comes in at about 2 grams of net carbs per serving. That’s still low, but it’s double what you’d get from a simpler recipe. Some brands add cornstarch, maltodextrin, or high fructose corn syrup as thickeners and sweeteners, which can push the carbs higher. Always check the nutrition label rather than assuming all blue cheese dressings are the same.
A quick scan of the ingredients list tells you most of what you need to know. If sugar appears near the top of the list, or if you see multiple sweeteners and starches, that brand will be higher in carbs. If the list is short (oil, buttermilk, blue cheese, vinegar, egg yolk, salt), you’re likely looking at 1 to 2 grams of net carbs.
The Seed Oil Question
Most commercial blue cheese dressings use soybean oil or canola oil as the base. These are high in omega-6 fatty acids, which some keto followers try to minimize. If you’re focused strictly on carb counts, seed oils don’t contain carbohydrates and won’t affect ketosis. But if you follow what some communities call “clean keto,” where the quality of fats matters alongside the macros, finding a dressing made with olive oil or avocado oil can be a challenge. Store-bought options with those oils exist but are less common and typically more expensive.
Making Your Own
Homemade blue cheese dressing gives you full control over ingredients and usually lands under 1 gram of net carbs per serving. The base is simple: equal parts mayonnaise and full-fat sour cream (about a quarter cup of each), thinned with a tablespoon of almond milk or heavy whipping cream. Add a tablespoon of lemon juice or vinegar, then fold in crumbled blue cheese, salt, and garlic to taste.
This version skips the added sugar entirely, uses whatever oil you prefer in the mayo, and takes about five minutes. You can adjust the thickness by adding more almond milk or cream. Stored in the fridge, it keeps well for about a week. If you want a chunkier dressing, save some of the blue cheese crumbles and stir them in at the end rather than blending everything smooth.
How Much You Can Use Without Worry
At 1 to 2 grams of net carbs per two-tablespoon serving, blue cheese dressing leaves plenty of room in a typical keto carb budget. Even if you’re generous and use four tablespoons on a salad, you’re looking at 2 to 4 grams of carbs, a small fraction of the 20 to 30 grams most people aim for daily. Virta Health, a clinic specializing in ketogenic diets for metabolic health, notes that blue cheese dressing fits comfortably into a ketogenic lifestyle as long as total daily carbohydrate intake stays at or below 30 grams.
The bigger consideration with large servings is calories, not carbs. Four tablespoons of blue cheese dressing adds over 30 grams of fat and close to 300 calories. That’s not a problem if it replaces other fat sources in your meal, but it can add up quickly if you’re drizzling it on top of an already fat-heavy plate. For most people on keto, two tablespoons is a practical serving that adds flavor and fat without overshooting calorie targets.