2800 calories As per MyPlate, an active 15-year-old boy needs 2800 cal/day to maintain his weight.
The calorie is a type of energy unit. For historical reasons, there are two basic definitions of "calorie." Originally, the big calorie, meal calorie, or kilogram calorie was defined as the amount of heat required to increase the temperature of one kilogram of water by one degree Celsius.
The calorie was initially defined as the amount of heat necessary at one standard atmosphere of pressure to increase the temperature of one gram of water one degree Celsius. Since 1925, the calorie has been defined in terms of the joule, with one calorie equivalent to approximately 4.2 joules since 1948.
A calorie is defined as the amount of energy required to raise one kilogram of water by one degree Celsius.
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