Scale to GramsHow Much Does a Watermelon Weigh? Sizes, Rind & Edible Weight
Average Watermelon Weight by Size
Watermelons are one of the heaviest common fruits, and their size range is enormous. A personal or mini watermelon weighs 2-4 kg (4-9 lbs) and serves 2-4 people. A small watermelon weighs 4-7 kg (9-15 lbs) and serves 6-8 people. A medium watermelon weighs 7-11 kg (15-25 lbs) and serves 10-15 people. A large watermelon weighs 11-14 kg (25-30 lbs) and serves 15-20 people. Giant watermelons grown for competition can exceed 45 kg (100 lbs), with the world record at over 159 kg (350 lbs). The most common size sold in supermarkets is medium, typically around 9 kg (20 lbs).
Edible Weight vs. Total Weight
About 68% of a watermelon's weight is edible red flesh. The rind (the white and green outer layer) accounts for about 32% of total weight. For a 9 kg (20 lb) medium watermelon, that means approximately 6.1 kg (13.6 lbs) of edible fruit and 2.9 kg (6.4 lbs) of rind. The rind is technically edible — it is used in pickles, stir-fries, and smoothies in many cuisines — but most people discard it. When buying watermelon for a party, plan on about 200-250 grams (about half a pound) of edible fruit per person as a serving. That means a medium 9 kg watermelon provides about 24-30 servings.
Watermelon Calories and Nutrition
Watermelon is remarkably low in calories for how sweet and satisfying it tastes. The edible flesh contains only 30 calories per 100 grams — one of the lowest calorie counts of any fruit. A standard wedge (about 280g or one-sixteenth of a medium melon) has about 84 calories. An entire cup of diced watermelon (150g) has just 46 calories. The fruit is 91% water, which explains both its weight and its low calorie density. Nutritionally, watermelon provides vitamin C, vitamin A, potassium, and is one of the richest dietary sources of lycopene — the same antioxidant that makes tomatoes red. Watermelon also contains citrulline, an amino acid that may improve exercise performance and reduce muscle soreness.
Choosing a Watermelon by Weight
A heavier watermelon relative to its size typically indicates higher water content and a juicier fruit. When comparing two watermelons of similar size, pick the heavier one. Look for the "field spot" — the yellowish patch where the melon rested on the ground. A creamy yellow field spot indicates the melon ripened fully in the field. A white or absent field spot means it was picked too early. The melon should feel heavy for its size, have a dull (not shiny) surface, and produce a deep, hollow sound when tapped. A ripe watermelon at the supermarket is typically around 9 kg, and you can verify this by photographing it next to your shopping cart and using Scale to Grams for a quick AI weight estimate.
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