Is Mayo Keto? The Short Answer
Yes. Real, full-fat mayonnaise is keto-friendly and one of the easiest condiments to keep in your rotation. A standard tablespoon has about 0 to 1 gram of net carbs and no meaningful sugar, because mayo is essentially oil and egg yolk emulsified with a splash of vinegar or lemon juice. That is close to pure fat, which is exactly what a low-carb, high-fat diet is built around.
The trap is not mayonnaise itself. It is the sweetened and low-fat versions. “Light,” “reduced-fat,” and sandwich-spread products often replace fat with sugar and starch to keep the texture, and sweet dressings like Miracle Whip add sugar on purpose. Those are the ones that can quietly add carbs. Stick to a real, full-fat mayo and you are fine.
Mayo Net Carbs by Brand and Type
Here is how the common options compare. Net carbs are per 1 tablespoon, which is the typical serving on a nutrition label.
| Mayo brand / type | Net carbs per tbsp | Oil base | Keto verdict |
|---|---|---|---|
| Primal Kitchen Avocado Oil Mayo | ~0g | Avocado oil | Best |
| Chosen Foods Avocado Oil Mayo | ~0g | Avocado oil | Best |
| Sir Kensington’s Avocado Oil Mayo | ~0g | Avocado oil | Best |
| Hellmann’s / Best Foods Real Mayo | ~0g | Soybean oil | Keto-friendly |
| Duke’s Real Mayonnaise | ~0g | Soybean oil | Keto-friendly |
| Kewpie Mayonnaise | ~0-1g | Vegetable oil | Keto-friendly |
| Olive oil mayo (most blends) | ~0g | Olive + soybean/canola | Keto-friendly, check label |
| Hellmann’s Light / reduced-fat mayo | ~1-2g | Soybean oil | Avoid |
| Miracle Whip | ~2g | Soybean oil + sugar | Not keto |
The pattern is simple. Any real mayonnaise, name-brand or store-brand, tends to land at roughly 0 grams of net carbs. The moment a product is labeled light, low-fat, or sold as a “dressing,” carbs and sugar creep in.
Which Store Mayos Are Best
If your only question is carbs, almost any full-fat mayo on the shelf passes. Hellmann’s, Best Foods, Duke’s, and most store brands sit near 0 net carbs per tablespoon with no added sugar. Duke’s is a favorite among low-carbers specifically because it has never added sugar, which is a genuine selling point rather than marketing.
Where people differ is oil quality. Most conventional mayos are built on soybean oil, and some use canola. There is a real conversation in the keto community about seed oils and how much of them you want in your diet. Worth keeping factual here: soybean and canola mayos are not high in carbs and will not affect ketosis. The reason many keto eaters prefer avocado oil is a choice about fat sources and processing, not about carbs.
If you want to skip seed oils, the three avocado oil mayos to look for are:
- Primal Kitchen Avocado Oil Mayo - made with avocado oil and organic eggs, no added sugar, about 0g net carbs. Soy-free and dairy-free, with flavored versions like chipotle lime and garlic aioli. There is also an egg-free vegan version if you need it.
- Chosen Foods Avocado Oil Mayo - clean ingredient list, cage-free eggs, no added sugar, about 0g net carbs. Widely stocked and often the most affordable of the avocado oil group.
- Sir Kensington’s Avocado Oil Mayonnaise - free-range eggs and avocado oil with no added sugar, about 0g net carbs. Easy to find at mainstream grocery stores.
A quick word on “olive oil mayo.” It sounds like the healthiest option on the shelf, but most are blends where soybean or canola oil is the primary oil and olive oil is a minor ingredient. The carbs are still near zero, so it is keto-fine, just do not assume it is pure olive oil.
The 5-Minute Homemade Keto Mayo
Making mayo yourself is the cheapest way to control exactly which oil you use, and it takes about five minutes with an immersion (stick) blender. The immersion-blender method is far more forgiving than whisking by hand because it emulsifies almost automatically.
Ingredients
- 1 whole egg, at room temperature
- 1 cup avocado oil (or light olive oil)
- 1 tablespoon lemon juice or vinegar
- 1 teaspoon Dijon mustard
- 1/4 teaspoon salt
Steps
- Add the egg, lemon juice, mustard, and salt to the bottom of a tall, narrow jar or the cup that came with your immersion blender.
- Pour the oil in on top and let everything settle for about 30 seconds so the egg sinks to the bottom.
- Place the immersion blender all the way down at the bottom of the jar, touching the egg, and turn it on without moving it. You will see the mixture turn white and thick from the bottom up.
- Once the bottom two-thirds has emulsified, slowly tilt and lift the blender to pull the remaining oil into the mixture.
- Blend for a few more seconds until smooth. Taste and adjust salt or acid.
Store it in a sealed jar in the fridge and use it within about a week, since it contains raw egg and no preservatives. Room-temperature ingredients matter: a cold egg is the most common reason a batch fails to thicken.
Homemade mayo is also the base for nearly every creamy keto dressing. Once you have it, you are a couple of ingredients away from ranch, aioli, or a chipotle sauce. If dressings are your goal, see our guides to keto ranch and Caesar dressing on keto, and our full breakdown of which salad dressings work on keto.
What to Avoid
Not every jar in the condiment aisle plays nice. Skip or scrutinize these:
- Miracle Whip and other “dressings.” Miracle Whip is legally not mayonnaise. It contains added sugar, often high-fructose corn syrup, and runs around 2 grams of carbs per tablespoon. Those carbs add up quickly across a sandwich, a bowl of tuna salad, or a coleslaw.
- Light, reduced-fat, and fat-free mayo. When a product removes fat, it usually adds starch and sugar to hold the texture together. Light versions can carry 1 to 2 grams of net carbs per tablespoon and defeat the entire point of a high-fat condiment.
- Sweetened or flavored spreads. Honey mustard mayo, sweet chili mayo, and similar flavored spreads often hide several grams of added sugar. Read the label instead of trusting the name.
- Anything without a label check. The single best habit is to flip the jar over. You want a full-fat product with 0 grams of sugar per serving and a short ingredient list.
The Bottom Line
Mayo is keto. Real, full-fat mayonnaise sits at roughly 0 to 1 gram of net carbs per tablespoon, which makes it one of the friendliest condiments on a low-carb diet. Regular Hellmann’s and Duke’s pass on carbs; avocado oil brands like Primal Kitchen, Chosen Foods, and Sir Kensington’s are the upgrade if you want to skip seed oils. Avoid Miracle Whip and anything labeled light or low-fat, and when in doubt, whip up a jar yourself in five minutes.
