Carbs in Water
Keto-friendlyHow many carbs are in water?
Water has 1g net carbs per 100g — 3.1g total carbs minus 2.1g fiber — plus 2.6g protein, 0.2g fat, and 19 calories. With this carb count, water fits a keto or low-carb diet (usually 20–50g net carbs per day) in normal portions. Values are per per 100 g, sourced from USDA FoodData Central; net carbs are computed by CarbMeNot.
Tracking water on keto?
Snap a photo and CarbMeNot logs the 1g net carbs in water — and everything else you eat — automatically. No database searching, no guessing.
Last updated June 10, 2026 · Reviewed by Jordan Lee, Nutrition Editor
Values per 100 g.
Is water keto-friendly?
Yes — water is keto-friendly. It has 1g net carbs per 100g (3.1g total carbs − 2.1g fiber). On a standard keto diet (20–50g net carbs per day), that leaves plenty of room for other foods and meals.
Carbs by serving size
| Serving | Net carbs | Total carbs | Protein | Calories |
|---|---|---|---|---|
| 100 g (3.5 oz) | 1g | 3.1g | 2.6g | 19 |
| 1 oz (28 g) | 0.3g | 0.9g | 0.7g | 5 |
How many calories are in water?
Water has 19 calories per 100g. That's alongside 2.6g protein, 0.2g fat, and 1g net carbs per 100g.
Nutrition facts
| Nutrient | Amount (per 100 g) |
|---|---|
| Calories | 19 |
| Total carbs | 3.1g |
| Net carbs | 1g |
| Fiber | 2.1g |
| Sugar | 0g |
| Sugar alcohols | 0g |
| Protein | 2.6g |
| Fat | 0.2g |
| Sodium | 113mg |
| Potassium | 312mg |
Source: USDA FoodData Central (SR Legacy). Net carbs = total carbs − fiber − sugar alcohols, computed by CarbMeNot.
Log water in one tap
Snap a photo and CarbMeNot's AI logs the carbs, protein, and fat automatically.
Frequently asked questions
- How many carbs are in water?
- Water has 3.1g of total carbs and 1g of net carbs per 100 grams.
- How many net carbs are in water?
- Water has 1g of net carbs per 100 grams (total carbs 3.1g minus 2.1g fiber).
- Is water keto-friendly?
- Yes — water is keto-friendly. It has 1g net carbs per 100g (3.1g total carbs − 2.1g fiber). On a standard keto diet (20–50g net carbs per day), that leaves plenty of room for other foods and meals.
- How many calories are in water?
- Water has 19 calories per 100 grams.
Similar foods
CarbMeNot provides general nutrition information, not medical advice. Values are estimates — verify before relying on them for any health decision. See our Medical Disclaimer.