A typical serving of tomato (1 medium whole, 123 g) has about 22 calories. Per 100 g: 18 kcal, 0.9 g protein, 3.9 g carbs, 0.2 g fat. The same 100 g carries 1.2 g of fiber and 2.6 g of sugar. In a daily log it contributes close to nothing.
| Serving | Weight | Calories |
|---|---|---|
| 1 medium whole | 123 g | 22 kcal |
| 1 slice, medium | 20 g | 4 kcal |
| 1 large whole | 182 g | 33 kcal |
| 1 slice, thin/small | 15 g | 3 kcal |
| 100 g | 100 g | 18 kcal |
A whole medium tomato is about 22 calories, which makes it nearly free on any plate. On the energy-density scale, 18 kcal per 100 g puts tomato at the very low end. Protein density is strong: about 5.0 g of protein per 100 calories.
A typical serving (1 medium whole, 123 g) has about 22 calories, and 100 g has 18 kcal. Calories scale with weight, so double the portion means double the number.
There are 0.9 g of protein in 100 g of tomato, which works out to about 1.1 g per serving (1 medium whole). Treat it as an energy source rather than a protein source.
There are 3.9 g of carbohydrate per 100 g of tomato, or about 5 g in 1 medium whole (123 g).
Every value on this page comes from USDA FoodData Central, entry 170457 (SR Legacy). Serving figures are converted from the per-100-g data, so rounding can shift a total by a calorie or two.
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Get JoulesA note on accuracy: calculators like this one provide estimates based on population-level formulas — your real needs vary with genetics, muscle mass, medical conditions, and more. Results are for information only and are not medical advice, a diagnosis, or a prescription. Talk to a doctor or registered dietitian before making significant changes to your diet or exercise, especially if you have a health condition, are pregnant, or are under 18.
Nutrition data: USDA FoodData Central, FDC ID 170457 (SR Legacy). Serving calories are computed from the per-100-g values.
