Tonic Water is not keto: it has ~22 g of net carbs per 1 glass (8 fl oz), against the keto diet's 5 g-per-serving limit.
Net carbs
22 g
per 1 glass (8 fl oz)
These are the carbs that count on keto: total carbs minus fiber.
With 22 g of net carbs per glass from added sugar, tonic water is high glycemic and not keto-friendly.
Nutrition facts for tonic water
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 (8 fl oz) (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 ~55 g of tonic water. A better keto alternative is diet soda or sparkling mineral water.
Best keto alternative
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See all: Bebidas keto
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.
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