Tonic Water Calories & Carbs
Last updated September 8, 2026 · Compiled by the CarbMeNot Team
Values per 12 fl oz (355g); per 100 g: 9.3g net carbs, 35 cal. Net carbs = total carbs − fiber − sugar alcohols — do the math for any label with the free net carbs calculator.
How many carbs are in tonic water?
Tonic Water — 12 fl oz (355g) — has 33g net carbs: 33g total carbs minus 0g fiber, plus 0g protein, 0g fat, and 124 calories. Per 100g that is 9.3g net carbs (9.3g total carbs, 0g fiber) and 35 calories. That makes tonic water relatively low in net carbs and lower than the typical drink, which averages about 21.1g net carbs per 100g. At this carb count, tonic water is best limited to small portions on keto (usually 20–50g net carbs per day). Values are per 100 g, sourced from Manufacturer-reported values; net carbs are computed by CarbMeNot.
Is tonic water keto-friendly?
Tonic Water is generally not keto-friendly. 12 fl oz (355g) is 33g net carbs (33g total carbs − 0g fiber); per 100g that is 9.3g net carbs. On a standard keto diet (20–50g net carbs per day), even one serving uses a large share of your daily carbs, so keep portions small or save it for a higher-carb day.
Keeping an eye on carbs in tonic water?
Tonic Water runs higher in carbs, so portions matter. CarbMeNot tracks every gram from a photo, so you stay under your daily limit without the math.
Carbs by serving size
| Serving | Net carbs | Total carbs | Protein | Calories |
|---|---|---|---|---|
| 12 fl oz | 33g | 33g | 0g | 124 |
| 100 g (3.5 oz) | 9.3g | 9.3g | 0g | 35 |
| 1 oz (28 g) | 2.6g | 2.6g | 0g | 10 |
How many calories are in tonic water?
Tonic Water — 12 fl oz (355g) — has 124 calories, with 0g protein, 0g fat, and 33g net carbs. Per 100g: 35 calories and 9.3g net carbs.
Nutrition facts
| Nutrient | Amount (per 100 g) |
|---|---|
| Calories | 35 |
| Total carbs | 9.3g |
| Net carbs | 9.3g |
| Fiber | 0g |
| Sugar | 9.3g |
| Sugar alcohols | 0g |
| Protein | 0g |
| Fat | 0g |
| Sodium | 11mg |
| Potassium | 0mg |
Source: Manufacturer-reported values (drinks). Net carbs = total carbs − fiber − sugar alcohols, computed by CarbMeNot.
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Frequently asked questions
- How many carbs are in tonic water?
- Tonic Water (12 fl oz, 355g) has 33g of total carbs and 33g of net carbs. Per 100 grams: 9.3g total, 9.3g net.
- How many net carbs are in tonic water?
- Tonic Water has 33g of net carbs per 12 fl oz (355g) — 33g total carbs minus 0g fiber.
- Is tonic water keto-friendly?
- Tonic Water is generally not keto-friendly. 12 fl oz (355g) is 33g net carbs (33g total carbs − 0g fiber); per 100g that is 9.3g net carbs. On a standard keto diet (20–50g net carbs per day), even one serving uses a large share of your daily carbs, so keep portions small or save it for a higher-carb day.
- How many calories are in tonic water?
- Tonic Water (12 fl oz, 355g) has 124 calories; that is 35 calories per 100 grams.
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CarbMeNot provides general nutrition information, not medical advice. Values are estimates — verify before relying on them for any health decision. See our Medical Disclaimer.