A plain, medium-sized bagel typically contains between about 250 and 300 calories. Most sources indicate a range around 270 calories on average for a standard 100-gram bagel, with some variation depending on size and ingredients. For example:

• Around 250 kcal for a standard wheat bagel

• Approximately 270 calories for a regular plain bagel

• USDA data suggests about 277 calories for a medium plain bagel

• CalorieKing lists 288 calories for a 3.5-inch, 3.7 oz plain bagel

• UK supermarket plain bagels may have about 230 calories, but sizes and recipes vary

Flavored or larger bagels, as well as those with toppings like cream cheese or peanut butter, can have significantly more calories, sometimes up to 400 or more

. In summary, a typical plain bagel contains roughly 250 to 300 calories, with exact values depending on size and recipe.