Is Tonic water keto?
Tonic water is not keto: it has ~26 g of net carbs per 1 glass, against the keto diet's 5 g-per-serving limit.
Net carbs = total − fiber
26 g
per 1 glass
These are the carbs that count on keto: total carbs minus fiber.
Tonic water is not keto-friendly because one glass contains 26.4 g of net carbs.
Nutrition facts for tonic water
How many carbs are in tonic water?
Tonic water has ~26 g of carbs and ~26 g of net carbs per 1 glass (total carbs minus 0 g of 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 26 g per 1 glass (26 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 ~45 g of tonic water.
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See all: Keto drinks
Reviewed by the Ketorai team · Last updated: July 5, 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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