2.5 kilograms is equal to 5.5115565546 pounds. To convert kilograms to pounds, you can use the formula:

[lb] = [kg] x 2.2046226218

Plugging in 2.5 for [kg], we get:

[lb] = 2.5 x 2.2046226218 = 5.5115565546

Therefore, 2.5 kilograms is equal to 5.5115565546 pounds.