Top 10 · Updated October 2026
Lowest-Calorie Tonic Water
The 10 lightest tonic water products on this list range from 0.6 to 2 kcal per 100 g. The tonic water with the fewest calories per 100 g, so you can compare energy density at a glance. We checked 175 tonic water with complete data.
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How we built this list
We ranked all published tonic water on Foodmetria that have a photo and the required nutrition data, using values per 100 g from the product label. Ties are broken by Nutri-Score and by how often shoppers scan the product. Rankings update automatically as label data changes. Read our methodology.