The short answer
Regular tonic is sugar water; choose diet tonic or soda water.
A typical serving is 8 oz (240 g). That has 82 calories, 0 g protein, 0 g fat and 21.1 g net carbs (21.1 g total carbs − 0 g fiber).
How many servings fit in your carb budget?
Based on using your entire daily net-carb limit on this one food, which you would not do in practice.
Lower-carb swaps for tonic water
Nutrition facts
Per 100 g: 34 kcal · 8.8 g net carbs · 0 g protein · 0 g fat. Estimates vary by brand and preparation.
Frequently asked questions
Is tonic water keto?
No, tonic water is not keto-friendly. A serving (8 oz (240 g)) has about 21.1 g of net carbs, about 84% of a typical 25 g daily limit.
How many carbs are in tonic water?
A serving of tonic water (8 oz (240 g)) has about 21.1 g of total carbohydrates and 0 g of fiber, which works out to roughly 21.1 g of net carbs. Per 100 g it has about 8.8 g of net carbs.
Can I eat tonic water on a keto diet?
Most people on keto avoid it. Regular tonic is sugar water; choose diet tonic or soda water. If you want to fit it in, treat it as an occasional small portion and count the carbs.
What can I eat instead of tonic water?
Lower-carb swaps include water, sparkling water, black coffee, tea (unsweetened).
More beverages
Get your personal carb limit
The free keto calculator sets your daily calories, protein, fat and net carbs, then the tracker keeps score.
Skip the counting
The 28-Day Plan has every meal's macros done for you. $29, instant download.