Carbs in Tomato
Keto-friendlyHow many carbs are in tomato?
Tomato has 2.4g net carbs per 100g — 4g total carbs minus 1.6g fiber — plus 0.8g protein, 0g fat, and 20 calories. 1 medium tomato (123g) works out to about 3g net carbs and 25 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 per 100 g, sourced from Open Food Facts; net carbs are computed by CarbMeNot.
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Last updated June 10, 2026 · Reviewed by Jordan Lee, Nutrition Editor
Values per 100 g.
Is tomato keto-friendly?
Yes — tomato is keto-friendly. It has 2.4g net carbs per 100g (4g total carbs − 1.6g fiber). A typical serving — 1 medium tomato (123g) — is about 3g net carbs. On a standard keto diet (20–50g net carbs per day), that leaves plenty of room for other vegetables and meals.
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 has 20 calories per 100g. 1 medium tomato (123g) has about 25 calories. That's alongside 0.8g protein, 0g fat, and 2.4g net carbs per 100g.
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 has 4g of total carbs and 2.4g of net carbs per 100 grams.
- How many net carbs are in tomato?
- Tomato has 2.4g of net carbs per 100 grams (total carbs 4g minus 1.6g fiber).
- Is tomato keto-friendly?
- Yes — tomato is keto-friendly. It has 2.4g net carbs per 100g (4g total carbs − 1.6g fiber). A typical serving — 1 medium tomato (123g) — is about 3g 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 has 20 calories per 100 grams.
- How many carbs are in 1 medium tomato?
- 1 medium tomato (123g) has about 3g net carbs, 4.9g total carbs, and 25 calories.
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.