Tonic water is not keto: it has ~22 g of net carbs per 1 glass (250 ml), against the keto diet's 5 g-per-serving limit.
Net carbs
22 g
per 1 glass (250 ml)
These are the carbs that count on keto: total carbs minus fiber.
It has about 22 g of net carbs per glass, almost all of it added sugar with a high glycemic index.
Nutrition facts for tonic water
0 g
Fat
0 g
Protein
0 g
Fiber
Why tonic water is not keto?
On keto the goal is to stay under ~5 g of net carbs per serving; tonic water has 22 g per 1 glass (250 ml) (22 g total − 0 g of fiber).
How much tonic water can I eat on keto?
To stay under 5 g of net carbs, the limit is ~57 g of tonic water. A better keto alternative is agua tónica.
Best keto alternative
Related
✓Yes
Diet soda
0 g net
/ 1 glass (240 ml)
✓Yes
Sparkling water
0 g net
/ 1 glass
✓Yes
Cortado
1 g net
/ 1 small cup (about 75 ml)
✓Yes
Water
0 g net
/ 1 glass
✓Yes
Coffee
0 g net
/ 1 cup
✓Yes
Almond milk
0 g net
/ 1 glass (240 ml)
See all: Bebidas 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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