Watermelon calories: nutrition, weighed portions and preparation

How many calories does watermelon contain?

For the numbers in this guide, watermelon means “Watermelon, raw” (USDA FoodData Central 167765). It contains 30 kcal per 100 g edible portion. The reference describes edible raw watermelon. A wedge weighed with its rind is not all edible fruit. Keeping that definition attached to the number prevents a plain ingredient from being mistaken for a prepared meal.

A weighed 250 g portion provides approximately 75 kcal: 250 × 30 ÷ 100. A smaller 125 g portion gives 37.5 kcal, while 375 g gives 112.5 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 0.6 g protein, 7.5 g total carbohydrate, 0.1 g fat and 0.4 g fiber. For the illustrated 250 g portion, those amounts become 1.5 g protein, 18.9 g carbohydrate, 0.4 g fat and 1 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.

Watermelon rind is excluded from edible fruit weight. A wedge can be visually impressive while containing substantial discarded rind, which is why total wedge weight can overstate the eaten portion.

Weighing watermelon without guessing a serving

Remove the rind before weighing, or subtract the discarded rind afterward. Record the amount eaten rather than the whole serving platter. A useful kitchen sequence is to place an empty bowl on the scale, tare it to zero, add the edible watermelon, 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 shared platter, weigh the cubes served to you or subtract the uneaten fruit. Juice and slushes need their own ingredient and serving calculations because a drink may include more than watermelon.

What changes in a complete dish?

Added water changes a drink’s concentration but does not cancel the energy of the fruit used. A watermelon dessert with syrup should retain both ingredients in its recipe total.

Juice, sweetened drinks and frozen desserts need their own recipes. Added water may dilute a drink without removing ingredient energy.

For an explicit ingredient example, 250 g of the named watermelon plus 5 g olive oil gives approximately 119.2 kcal. The watermelon contributes 75 kcal and the oil contributes 44.2 kcal. This is an illustrative two-ingredient calculation, not a tested recipe or a claim that watermelon is always served with oil.

How watermelon compares with raw peach

The comparison food is “Peaches, yellow, raw” (FDC 169928), which contains 39 kcal per 100 g. At equal 250 g weights, the watermelon reference supplies 75 kcal and raw peach supplies 97.5 kcal: a difference of 22.5 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 watermelon 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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