Q:

How many calories does a person need per day?

A:

Quick Answer

The number of calories a person needs per day varies based on height, weight, gender, age and activity level. To calculate the total number of calories a person needs per day, take into account the body's basal metabolic rate, the person's physical activity level and the thermic effect of food.

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How many calories does a person need per day?
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Full Answer

The basal metabolic rate is the amount of energy a body needs to function at rest, which accounts for about 60 to 70 percent of the calories burned in a day. Physical activity burns calories, but the number of calories burned in a given activity depends on the person's weight. The thermic effect of food is the amount of energy the body uses to digest the food eaten.

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