Calories in raw tomatoes.
18 kcal per 100 g.
Tomatoes are 95% water and 18 kcal per 100 g. A medium tomato (~123 g) is about 22 kcal — one of the few foods where the cooking oil in a sauce outweighs the vegetable several times over.
Tomatoes, red, ripe, raw, year round average · SR Legacy (2018-04) · USDA FDC 170457
Nutrition for your portion
| Nutrient | Per 100 g | 100 g |
|---|---|---|
| Energy | 18 kcal | 18 kcal |
| Protein | 0.88 g | 0.88 g |
| Carbohydrates | 3.89 g | 3.89 g |
| Fat | 0.2 g | 0.2 g |
| Fibre | 1.2 g | 1.2 g |
| Sugars | 2.63 g | 2.63 g |
| Saturated fat | 0.03 g | 0.03 g |
| Sodium | 5 mg | 5 mg |
| Salt (calculated from sodium) | 0.01 g | 0.01 g |
| Vitamin A (RAE) | 42 ug | 42 ug |
| Vitamin D (D2 + D3) | 0 ug | 0 ug |
| Vitamin E (alpha-tocopherol) | 0.54 mg | 0.54 mg |
| Vitamin K (phylloquinone) | 7.9 ug | 7.9 ug |
| Vitamin C | 13.7 mg | 13.7 mg |
| Thiamin | 0.04 mg | 0.04 mg |
| Riboflavin | 0.02 mg | 0.02 mg |
| Niacin | 0.59 mg | 0.59 mg |
| Vitamin B6 | 0.08 mg | 0.08 mg |
| Folate, total | 15 ug | 15 ug |
| Vitamin B12 | 0 ug | 0 ug |
| Potassium | 237 mg | 237 mg |
| Calcium | 10 mg | 10 mg |
| Phosphorus | 24 mg | 24 mg |
| Magnesium | 11 mg | 11 mg |
| Iron | 0.27 mg | 0.27 mg |
| Zinc | 0.17 mg | 0.17 mg |
| Selenium | 0 ug | 0 ug |
| Iodine | Unknown | Unknown |
| Copper | 0.06 mg | 0.06 mg |
Energy comes from USDA nutrient 1008. Salt is calculated as sodium × 2.5, with unit conversion to grams. It is not a separately measured salt value.
Preparation
Raw tomatoes are 18 kcal per 100 g and 95% water. Cooking evaporates that water and concentrates the rest: tomato purée runs 40–80 kcal per 100 g, tomato paste over 80, sun-dried over 250. The calories did not multiply; the tomato shrank. Roasted in oil, the oil is the number.
Logging this food
A medium tomato (about 123 g) is 22 kcal; a cup chopped (180 g) is 32; a single cherry tomato 3. Nothing here needs a scale — but a cup of cherry tomatoes with a tablespoon of olive oil is 27 kcal of tomato and 119 of oil. Canned tomatoes match the raw row closely.
Swaps and alternatives
Cucumber (15 kcal) and lettuce are the only common salad vegetables that go lower, and not by much. Tomatoes are themselves the swap for calorie-dense sauces: a fresh tomato salsa is under 30 kcal per 100 g against 100–200 for cream-based dressings.