How many calories are in 100 grams of jamón ibérico?

How to get close to this number

Work from the fat fraction. Cured ham is roughly a third fat and most of the rest protein, and fat carries more than twice the energy of protein per gram. Apply those proportions to a hundred grams and the answer falls out. Once you know the macronutrient split of a food, its calorie content is arithmetic rather than recall.

Curing is what catches people out. The process removes water, which concentrates everything left behind, so cured meat is substantially more energy dense per gram than the fresh meat it came from. Any dried or cured food — ham, dried fruit, hard cheese — carries this trap, and it is the single most common source of underestimation in food questions.

The composition point in the explanation is what makes this ham genuinely unusual rather than just expensive: the fat is largely oleic acid, the same monounsaturated fat that dominates olive oil, because the pigs are finished on acorns. Energy content and nutritional quality are separate questions, and this is one of the clearest cases where a high-calorie food has a favourable fat profile.