Tomato calories: nutrition, weighed portions and preparation

How many calories does tomato contain?

For the numbers in this guide, tomato means “Tomatoes, red, ripe, raw, year round average” (USDA FoodData Central 170457). It contains 18 kcal per 100 g edible portion. A sliced tomato can be eaten plain or dressed as a salad. Oil and cheese belong to the salad calculation, not the plain tomato record. Keeping that definition attached to the number prevents a plain ingredient from being mistaken for a prepared meal.

A weighed 150 g portion provides approximately 27 kcal: 150 × 18 ÷ 100. A smaller 75 g portion gives 13.5 kcal, while 225 g gives 40.5 kcal. These are calculated amounts of the named food, not claims about the weight of a standard piece, cup or restaurant serving.

What comes with those calories?

The same 100 g reference provides 0.9 g protein, 3.9 g total carbohydrate, 0.2 g fat and 1.2 g fiber. For the illustrated 150 g portion, those amounts become 1.3 g protein, 5.8 g carbohydrate, 0.3 g fat and 1.8 g fiber. Calories and individual nutrients describe different parts of the food, so keep all of them on the same portion basis when reading the table.

A tomato salad and a tomato-based sauce answer different kitchen questions. Slices are usually weighed as edible raw fruit; a sauce needs its final recipe weight, particularly when simmering reduces the liquid.

Weighing tomato without guessing a serving

Remove the stem and weigh the edible slices. Cherry tomatoes can be weighed together instead of assigning a generic size to each one. A useful kitchen sequence is to place an empty bowl on the scale, tare it to zero, add the edible tomato, and note the grams before combining it with other foods. If you serve only part of that amount, record the part eaten. Leftovers matter because the amount available and the amount consumed are different quantities.

For a sandwich, weigh the slices before assembling it. For a shared salad, weigh the chopped tomato separately from dressing and divide according to the amount served.

What changes in a complete dish?

A caprese-style plate needs the mozzarella and oil as well as tomato. A salsa with onion and herbs needs a recipe entry if those ingredients make up a meaningful part of the portion.

Roasted tomatoes lose water; canned sauce and dried tomatoes need their own records.

For an explicit ingredient example, 150 g of the named tomato plus 5 g olive oil gives approximately 71.2 kcal. The tomato contributes 27 kcal and the oil contributes 44.2 kcal. This is an illustrative two-ingredient calculation, not a tested recipe or a claim that tomato is always served with oil.

How tomato compares with cucumber

The comparison food is “Cucumber, with peel, raw” (FDC 168409), which contains 15 kcal per 100 g. At equal 150 g weights, the tomato reference supplies 27 kcal and cucumber supplies 22.5 kcal: a difference of 4.5 kcal. That is a calculation for these records, not a universal ranking of foods or an instruction to exchange equal portions.

Compare the nutrients as well as the energy in the named records below. A food with a different water content, texture or role in the meal may not be a direct substitute. For a real swap, compare the amounts you plan to eat and include the rest of the plate, rather than choosing solely from the lower number in a 100 g table.

Recording the meal in BiteCal

In BiteCal, start with a photo of the tomato portion and the rest of the meal. Review the proposed food name, preparation, amount and visible additions before saving the calorie and macro estimate. If you already know the gram weight, use it as a check rather than accepting a visually plausible portion. A photo cannot establish a hidden oil quantity or replace the identity of a packaged product.

The nutrient figures come from USDA SR Legacy, final release April 2018. They provide a reproducible reference for the named food rather than a laboratory result for your own serving. Use the current package or restaurant information when it describes your exact product more closely. Rounding explains small differences between displayed portions; calculations here use the retained unrounded reference values.

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