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How Many Calories in Tomato?
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Quick reference — common serving sizes
| Amount | Calories | Protein |
|---|---|---|
| 1 oz (28g) | 5 kcal | 0.3g |
| 100g | 18 kcal | 0.9g |
| 1 medium tomato | 22 kcal | 1.1g |
A tomato contains 18 calories per 100g. A typical 1 medium tomato (123g) provides about 22 calories. Tomato is low in calories. Accurate tracking starts with weighing portions — a digital kitchen scale removes all the guesswork.
Tomato Nutrition Facts
| Nutrient | Per 100g | Per serving (123g) |
|---|---|---|
| Calories | 18 kcal | 22 kcal |
| Protein | 0.9g | 1.1g |
| Carbohydrates | 3.9g | 4.8g |
| of which Sugars | 2.6g | 3.2g |
| Fat | 0.2g | 0.2g |
| of which Saturates | 0.0g | 0.0g |
| Fibre | 1.2g | 1.5g |
| Sodium | 5.0mg | 6mg |
| Potassium | 237.0mg | 292mg |
| Calcium | 10.0mg | 12mg |
| Iron | 0.3mg | 0.4mg |
| Vitamin C | 13.7mg | 16.9mg |
| Vitamin A | 42.0µg | 52µg |
| Selenium | 0.0µg | 0µg |
| Riboflavin (B2) | 0.0mg | 0.0mg |
% of Daily Value (per 100g)
Based on a standard 2,000-calorie reference diet — the same basis used on nutrition labels in the US and UK.
- Low in saturated fat (0% DV)
- Low in sodium (0% DV)
- A good source of vitamin C (15% DV)
- Calories: 1% DV
- Protein: 2% DV
- Carbohydrates: 1% DV
- Fibre: 4% DV
- Fat: 0% DV
- Saturated fat: 0% DV
- Sodium: 0% DV
- Potassium: 5% DV
- Calcium: 1% DV
- Iron: 2% DV
- Vitamin C: 15% DV
- Vitamin A: 5% DV
- Selenium: 0% DV
- Riboflavin (B2): 0% DV
Useful for tracking tomato
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MORiSH Pork Chicharrónes
79% protein, zero carbs. Air-fried, not baked. One of the cleanest macros of any snack.
Shop MORiSH →Have a cat or dog? Check whether tomato is safe for your dog or safe for your cat before sharing. Also check the full ingredient breakdown and food safety guide for pregnancy and storage advice. Use a meal prep container set to portion out tomato for the week. Tracking supplements too? Check drug and supplement interactions before combining anything new.
Good to know
Cooking method matters here too — boiling can leach some water-soluble vitamins into the cooking water, while steaming or roasting tends to retain more.
Does tomato fit your diet?
Low-carb / keto
Tomato contains 3.9g of carbohydrate per 100g, low enough to fit comfortably within most low-carb or ketogenic daily carb allowances — check the fat and protein split above against your specific macro targets.
Weight management
At 18 calories per 100g, tomato is calorie-light relative to its volume, which can help keep a meal within a calorie target without needing very small portions.
Frequently Asked Questions
How many calories in tomato per 100g?
Tomato contains 18 calories per 100g, based on USDA reference data.
Is tomato high in calories?
A 1 medium tomato of tomato (123g) has around 22 calories — roughly 1% of a 2,000-calorie daily intake.
Is tomato good for weight loss?
At 18 calories per 100g, tomato is relatively low in calories and can fit well into a weight-loss diet. A 1 medium tomato provides about 22 calories.
How much protein is in tomato?
Tomato contains 0.9g of protein per 100g.
Is tomato a good source of fibre?
Tomato is relatively low in fibre at 1.2g per 100g, so pairing it with fibre-rich sides (vegetables, whole grains, legumes) can help balance a meal.
How does tomato compare to vinegar, distilled?
Tomato has 18 calories per 100g, close to vinegar, distilled at 18 — 0 calories fewer per 100g. See the full macro breakdown above.
Is tomato keto-friendly?
Tomato contains 3.9g of carbohydrate per 100g, which fits comfortably within most ketogenic daily carb allowances — check it against your specific daily carb target.
How many servings of tomato for 20g of protein?
With 0.9g of protein per 100g, you'd need roughly 2222g of tomato to reach 20g of protein
Foods with a similar calorie count
Other vegetables closest to tomato by calories per 100g:
| Food | Calories | Protein | Carbs | Fat |
|---|---|---|---|---|
| Tomato (this page) | 18 kcal | 0.9g | 3.9g | 0.2g |
| Vinegar, Distilled | 18 kcal | 0.0g | 0.0g | 0.0g |
| Asparagus, Frozen, Cooked, Boiled | 18 kcal | 3.0g | 1.9g | 0.4g |
| Celery, Cooked, Boiled, Drained | 18 kcal | 0.8g | 4.0g | 0.2g |
| Celtuce, Raw | 18 kcal | 0.8g | 3.6g | 0.3g |
| Peppers, Sweet, Green, Canned | 18 kcal | 0.8g | 3.9g | 0.3g |
| Peppers, Sweet, Green, Frozen | 18 kcal | 0.9g | 3.9g | 0.2g |
More kit for tomato tracking
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DeerRun A1 Pro Treadmill
Hit your calorie targets at home — DeerRun's fold-flat treadmill hits 10mph with auto incline.
Shop DeerRun →Last updated:
Nutrition data: USDA FoodData Central (public domain, CC0 1.0). Values are per 100g unless stated.