Yes, cucumbers are very keto-friendly. A 1-cup sliced serving (about 104g) has roughly 3.5g total carbs and only about 2g net carbs after fiber. With around 1.5-2g net carbs per 100g, cucumbers are one of the most keto-safe vegetables you can eat, even on a strict 20g-net-carb day.

Are pickles keto-friendly too?

Dill and sour pickles are keto-friendly, with under 1g net carb per spear, because they are simply fermented or brined cucumbers. Avoid bread-and-butter or sweet pickles, which add sugar and can carry 5-7g net carbs per serving. Always check the label for added sugar.

Can you eat cucumbers every day on keto?

Yes. Cucumbers are about 95% water and extremely low in carbs, so a full medium cucumber daily adds only about 4-5g net carbs. They are also a good source of potassium and hydration, which helps offset the electrolyte loss common in the first weeks of keto.

Is Cucumbers Keto? Carbs, Net Carbs & Verdict

Q: How many carbs are in cucumbers?

A 1-cup sliced serving (104g) of cucumber with peel has about 3.5g total carbs, 0.5g fiber, and roughly 3g net carbs. Per 100g, cucumber has about 3.6g total carbs, 0.5g fiber, and 1.5-2g net carbs. Half a medium cucumber (about 150g) lands near 3g net carbs.

Yes, cucumbers are keto-friendly. A 1-cup sliced serving has just 2g net carbs. See total carbs, fiber, and how much you can eat on keto.

Yes, cucumbers are keto-friendly, and they're one of the safest vegetables you can put on your plate.

A 1-cup sliced serving of cucumber (about 104g, with peel) has roughly 3.5g total carbs, 0.5g of fiber, and only about 2-3g net carbs. Per 100g, cucumbers carry about 3.6g total carbs and just 1.5-2g net carbs, since they're roughly 95% water. A standard ketogenic diet caps you at 20-50g net carbs per day, and cucumbers barely make a dent. You could eat an entire medium cucumber and still spend only ~4-5g net carbs. Verdict: cucumbers are firmly keto-approved and a smart everyday choice.

How many carbs are in cucumbers?

Cucumbers are mostly water and fiber, which is exactly why they're so keto-friendly. The carb load is tiny across every realistic serving size.

Serving	Total carbs	Fiber	Net carbs
100g (raw, with peel)	3.6g	0.5g	~2g
1 cup sliced (104g)	3.5g	0.5g	~3g
1/2 medium cucumber (150g)	5.4g	0.8g	~3g
1 medium cucumber (300g)	11g	1.5g	~4.5g
5 thin slices (~30g)	1.1g	0.2g	<1g

Net carbs are calculated as total carbs minus fiber, which is how most keto dieters count. Even a full medium cucumber stays under 5g net carbs, leaving you plenty of room for the rest of your day.

How much cucumbers can you eat on keto?

Practically as much as you want. Because cucumbers run about 1.5-2g net carbs per 100g, you'd have to eat roughly 1kg (over two pounds) of cucumber to hit even 20g net carbs, the lower end of the keto range.

For most people, a sensible everyday portion looks like:

Snacking: A cup of sliced cucumber with a fat-based dip (ranch, guacamole, cream cheese) = ~3g net carbs.
Salads: Half a cucumber tossed into a Greek-style salad = ~3g net carbs.
Hydration: Cucumber-infused water adds essentially zero carbs.

The only thing to watch is what goes on the cucumber. Sweet dressings, honey-based marinades, and sugary dips add the carbs, not the cucumber itself.

Are pickles and cucumber dishes keto-friendly?

Most cucumber preparations stay keto, but a few sneak in sugar:

Dill and sour pickles: Keto-friendly, under 1g net carb per spear. They're just brined cucumbers.
Cucumber salad (vinegar-based): Keto-friendly if made with vinegar, oil, salt, and dill.
Tzatziki: Keto-friendly. Greek yogurt, cucumber, garlic, and olive oil keep it low-carb.
Bread-and-butter or sweet pickles: Not keto. Added sugar pushes them to 5-7g net carbs per serving.
Cucumber smoothies with fruit/honey: Carb count depends entirely on the added sweeteners.

When in doubt, scan the nutrition label for "added sugars." If the cucumber product has more than a gram or two of sugar, it's been sweetened.

Best low-carb vegetables alongside cucumbers

Cucumbers are already excellent, but variety helps your micronutrients. Here's how they compare to other keto-friendly vegetables by net carbs per 100g:

Vegetable	Net carbs (per 100g)	Keto verdict
Cucumber	~2g	Excellent
Celery	~1.4g	Excellent
Romaine lettuce	~1.2g	Excellent
Zucchini	~2.1g	Excellent
Bell pepper (green)	~2.9g	Great
Cherry tomatoes	~2.7g	Great
Broccoli	~4g	Good

Cucumbers, celery, and leafy greens are the "eat freely" tier. They're so low in carbs that portion size rarely matters on keto.

Do cucumbers offer any keto benefits beyond low carbs?

Yes. Beyond being low-carb, cucumbers help with two things keto dieters often struggle with:

Hydration and electrolytes. At ~95% water with a decent dose of potassium, cucumbers support the fluid and electrolyte balance that gets thrown off during the early "keto flu" phase.
Volume and satiety. Their high water and fiber content adds bulk and crunch to meals for almost no carbs, which helps you feel full without spending your carb budget.

They also provide small amounts of vitamin K, vitamin C, and antioxidants, mostly concentrated in the peel, so leave the skin on when you can.

The bottom line

Cucumbers are unambiguously keto. At roughly 2-3g net carbs per cup and just 1.5-2g per 100g, they fit any version of the ketogenic diet, including strict 20g protocols. Eat them sliced, pickled (unsweetened), or blended into tzatziki without a second thought.

Want to keep your daily totals on track? Log your cucumbers and everything else in CarbMeNot to see your net carbs update in real time and stay comfortably in ketosis.