Calories in Tonic Water

121kcal per 1 can (355 ml) (355 g)

34 kcal per 100 g · about 6% of a 2,000-kcal day

Tonic water is quietly sweetened, so a can is about 121 calories — nearly as much as soda. It is the hidden calorie source in a gin and tonic; soda water is the zero-calorie swap.

Tonic Water nutrition facts

NutrientPer 100 gPer 1 can (355 ml)
Calories34 kcal121 kcal
Protein0 g0 g
Carbs8.8 g31.2 g
Fat0 g0 g
Fiber0 g0 g
Sugar8.8 g31.2 g

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Values based on USDA FoodData Central reference entries. Actual nutrition varies with variety, preparation, and portion. © 2026 NibbleCal.