Watermelon is keto only in small portions: it has ~10 g of net carbs per 1 cup, cubed, against the keto diet's 5 g-per-serving limit.
Net carbs
10 g
per 1 cup, cubed
These are the carbs that count on keto: total carbs minus fiber.
It has about 10.9 g of net carbs per cup and a high glycemic index, so you'll want to keep the portion small.
Nutrition facts for watermelon
0.2 g
Fat
0.9 g
Protein
0.6 g
Fiber
Why watermelon is keto only in small portions?
On keto the goal is to stay under ~5 g of net carbs per serving; watermelon has 10 g per 1 cup, cubed (11 g total − 0 g of fiber).
How much watermelon can I eat on keto?
To stay under 5 g of net carbs, the limit is ~70 g of watermelon.
Related
✕No
Mango
46 g net
/ 1 medium fruit
✕No
Grapes
25 g net
/ 1 cup (stems removed)
~In moderation
Pineapple
9 g net
/ 1 medium slice
✕No
Blueberry
17 g net
/ 1 cup
~In moderation
Melon
11 g net
/ 1 cup, cubed
✕No
Banana
23 g net
/ 1 medium banana
See all: Frutas keto
Source: nutritional estimate (USDA-style reference) · Confidence: high
Reviewed by the Ketorai team · Last updated: July 1, 2026 · How we assign the verdict
For information only. This does not replace advice from a health professional.
Reviewed by the Ketorai team · Last updated: July 1, 2026 · How we assign the verdict
For information only. This does not replace advice from a health professional.
Something off? Let us know.
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