How calorie-dense is that food?

Calorie density is why a plate of vegetables and a handful of nuts feel so different for the same energy.

Calories per 100 g Unit

Almost exactly a bread

250 kcal is more than 6 of the 11 references on this page.

Reference figures are measurements and are rounded; the unit conversion behind them is exact.

Every reference on this page, with its size and its ratio to your number
Reference	Size	Yours ÷ theirs	Note
cucumber	16 kcal	15.6×	16 kcal
strawberries	32 kcal	7.82×
apple	52 kcal	4.81×
boiled potato	86 kcal	2.91×
cooked rice	130 kcal	1.92×
chicken breast	165 kcal	1.52×
bread	260 kcal	0.961×
cheddar cheese	404 kcal	0.619×
chocolate	526 kcal	0.475×
almonds	581 kcal	0.43×
olive oil	884 kcal	0.283×	The densest common food

Olive oil is 884 kcal per 100 g — 55 times cucumber. Every fat is close to 900 because fat itself is 9 kcal per gram.
Protein and carbohydrate are both 4 kcal per gram, fat is 9 and alcohol 7. Almost all calorie density follows from those four numbers plus water content.

Frequently asked

Fat content and water content. Fat carries more than twice the energy per gram of protein or carbohydrate, and water carries none at all.

For fullness, yes — people tend to eat a fairly consistent weight of food. Foods under about 150 kcal per 100 g are hard to overeat.