Tomato Calories & Carbs
Keto-friendlyLast updated September 8, 2026 · Compiled by the CarbMeNot Team
Values per 1 medium tomato (123g); per 100 g: 2.4g net carbs, 20 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 tomato?
Tomato — 1 medium tomato (123g) — has 3g net carbs: 4.9g total carbs minus 2g fiber, plus 1g protein, 0g fat, and 25 calories. Per 100g that is 2.4g net carbs (4g total carbs, 1.6g fiber) and 20 calories. That makes tomato very low in net carbs and lower than the typical vegetable, which averages about 17.9g net carbs per 100g. With this carb count, tomato fits a keto or low-carb diet (usually 20–50g net carbs per day) in normal portions. Values are per 100 g, sourced from Open Food Facts; net carbs are computed by CarbMeNot.
Is tomato keto-friendly?
Yes, tomato can fit a keto diet in moderate portions. 1 medium tomato (123g) is 3g net carbs (4.9g total carbs − 2g fiber); per 100g that is 2.4g net carbs. On a standard keto diet (20–50g net carbs per day), that leaves plenty of room for other vegetables and meals.
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Carbs by serving size
| Serving | Net carbs | Total carbs | Protein | Calories |
|---|---|---|---|---|
| 1 medium tomato | 3g | 4.9g | 1g | 25 |
| 100 g (3.5 oz) | 2.4g | 4g | 0.8g | 20 |
| 1 oz (28 g) | 0.7g | 1.1g | 0.2g | 6 |
How many calories are in tomato?
Tomato — 1 medium tomato (123g) — has 25 calories, with 1g protein, 0g fat, and 3g net carbs. Per 100g: 20 calories and 2.4g net carbs.
Nutrition facts
| Nutrient | Amount (per 100 g) |
|---|---|
| Calories | 20 |
| Total carbs | 4g |
| Net carbs | 2.4g |
| Fiber | 1.6g |
| Sugar | 3.2g |
| Sugar alcohols | 0g |
| Protein | 0.8g |
| Fat | 0g |
| Sodium | 16mg |
| Potassium | 0mg |
Source: Open Food Facts (Maestri). Net carbs = total carbs − fiber − sugar alcohols, computed by CarbMeNot.
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Frequently asked questions
- How many carbs are in tomato?
- Tomato (1 medium tomato, 123g) has 4.9g of total carbs and 3g of net carbs. Per 100 grams: 4g total, 2.4g net.
- How many net carbs are in tomato?
- Tomato has 3g of net carbs per 1 medium tomato (123g) — 4.9g total carbs minus 2g fiber.
- Is tomato keto-friendly?
- Yes, tomato can fit a keto diet in moderate portions. 1 medium tomato (123g) is 3g net carbs (4.9g total carbs − 2g fiber); per 100g that is 2.4g net carbs. On a standard keto diet (20–50g net carbs per day), that leaves plenty of room for other vegetables and meals.
- How many calories are in tomato?
- Tomato (1 medium tomato, 123g) has 25 calories; that is 20 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.