Is Mayo Keto? (Plus the Best and Worst Condiments)

Yes—plain mayonnaise is keto-friendly. It's almost pure fat with roughly 0g carbs per tablespoon, which makes it one of the easiest condiments to fit into a low-carb day. Choose full-fat mayo (ideally made with avocado or olive oil) and avoid low-fat or "light" versions, which often add sugar. Watch flavored or sweetened mayos too.

The bigger condiment trap on keto isn't mayo—it's everything you might squeeze next to it. Ketchup, BBQ sauce, and sweet chili sauce can quietly add more carbs than the meal itself. Here's a quick reference, then a full breakdown.

Condiment	Net carbs per tbsp	Keto-friendly?
Mayonnaise (full-fat)	~0g	Yes
Mustard (yellow/Dijon)	~0g	Yes
Hot sauce	~0g	Yes
Ranch (full-fat)	1-2g	Yes (in moderation)
Relish	~3g	Borderline
Ketchup	~4g	Limit
Honey mustard	~5g	Limit
BBQ sauce	6-8g	Avoid
Sweet chili sauce	7-10g+	Avoid

Is mayo keto?

Mayonnaise is keto because of what it's made from: oil, egg yolks, and a splash of acid like vinegar or lemon juice. None of those ingredients bring meaningful carbs, so a standard mayo lands at essentially 0g net carbs per tablespoon while delivering a big dose of fat—exactly the macro profile keto is built around.

The catch is in the variations. "Light" and reduced-fat mayos strip out the fat that makes mayo keto-friendly, then replace it with sugar or starch to keep the texture and taste. Flavored mayos (chipotle, sriracha, honey, sweet onion) can also sneak in sugar. The rule of thumb: the closer a mayo is to plain and full-fat, the better it fits keto.

For the cleanest option, look for mayonnaise made with avocado oil or olive oil. These use heart-healthier fats than the soybean or canola oil in many conventional brands, with the same near-zero carb count.

How many carbs are in mayonnaise?

A tablespoon of regular full-fat mayonnaise contains roughly:

• Carbs: ~0g
• Sugar: 0g
• Fat: ~10g
• Protein: ~0g

That's about as carb-free as a condiment gets. Even if you use two or three tablespoons in a tuna or egg salad, you're still adding close to zero carbs—just calories from fat, which on keto is the point.

Compare that to Miracle Whip, which is technically a "dressing," not mayo. It's sweetened with sugar and runs around 2g of carbs per tablespoon. Not disastrous, but it adds up across a sandwich or salad, and there's no reason to use it over real mayo on keto.

Because the difference between "0g" mayo and a sweetened version isn't obvious from taste alone, it helps to verify. With CarbMeNot, you can scan a jar's barcode and see the real net carbs per serving before it goes in your cart—no squinting at fine print required.

Best keto-friendly condiments

These earn a permanent spot in a keto kitchen:

• Mustard — Yellow and Dijon are near 0g carbs and add bold flavor for almost nothing.
• Hot sauce — Most vinegar-based hot sauces (Tabasco, Frank's, Cholula) are 0g carbs. Check sriracha, which is sweetened.
• Mayonnaise — Covered above. Full-fat, avocado- or olive-oil based is ideal.
• Full-fat ranch — Around 1-2g per tablespoon. Great for dipping veggies and wings; just watch portions.
• Soy sauce / tamari — Roughly 1g per tablespoon. Tamari is a good gluten-free swap.
• Pesto — Oil, nuts, cheese, and basil keep it low-carb and high-fat.
• Sugar-free ketchup — Several brands now make versions sweetened with a keto sweetener instead of sugar.

If you want to understand why "1-2g" matters more than total carbs on a label, our guide on what is net carbs breaks down the math.

Condiments to avoid on keto

The condiments that wreck a keto day all share one trait: added sugar.

• Ketchup — About 4g of carbs per tablespoon, and almost nobody stops at one tablespoon. Standard ketchup is roughly a quarter sugar by weight.
• BBQ sauce — One of the worst offenders at 6-8g per tablespoon. Brushed onto ribs or chicken, a serving can blow your whole daily carb budget.
• Sweet chili sauce — Often 7-10g+ per tablespoon. It's essentially sugar syrup with chili.
• Honey mustard — The honey turns a keto-safe condiment into a sugary one (~5g per tablespoon).
• Teriyaki and most stir-fry sauces — Sugar-heavy; check the label or make your own.
• Relish — Sweet relish carries added sugar (~3g per tablespoon).

You don't have to give these up forever—look for sugar-free or no-sugar-added versions, or make your own. Sugar-free ketchup and BBQ sauces have gotten genuinely good.

What to look for on the label

Two numbers tell you almost everything:

1. Total sugars — On keto, you want this at or near 0g. Any meaningful sugar in a condiment is a red flag.
2. Net carbs per serving — Total carbs minus fiber. Watch the serving size, since condiment labels love to call one tablespoon a serving when you'll realistically use three.

Also scan the ingredient list for hidden sweeteners: sugar, high-fructose corn syrup, honey, agave, molasses, cane juice, dextrose, and maltodextrin all count. The further down the list they appear, the better.

This is exactly where small amounts add up fast. A tablespoon here, a squeeze there, and you can quietly eat 15-20g of carbs from sauces alone without touching a single "carby" food. Logging them with CarbMeNot makes those hidden grams visible so they don't push you out of ketosis. For whole foods, our keto food list covers what's safe to reach for in the first place.

Don't let condiments sneak in carbs

Mayo is the easy part. The hard part is everything you don't think to count—the ketchup on the burger, the glaze on the wings, the dressing on the salad. CarbMeNot lets you scan a barcode or snap a photo to instantly see net carbs, so you can catch a sugary sauce before it derails your day. Track your macros, spot the hidden carbs, and stay in ketosis with confidence. Try CarbMeNot and take the guesswork out of condiments.

Key takeaways

• Plain, full-fat mayonnaise is keto at ~0g carbs per tablespoon—choose avocado or olive oil versions.
• Avoid low-fat, "light," and flavored mayos and Miracle Whip, which add sugar.
• Best keto condiments: mustard, hot sauce, mayo, full-fat ranch, soy sauce/tamari, pesto, and sugar-free ketchup.
• Worst keto condiments: ketchup, BBQ sauce, sweet chili, honey mustard, and teriyaki—all sugar-loaded.
• Read the label for total sugars and serving size, and scan for hidden sweeteners.
• Hidden carbs in sauces add up fast—scan and log them with CarbMeNot to stay in ketosis.