BMR Calculator
Even when you're sleeping, your body is burning calories. The Basal Metabolic
Rate produced by this calculator is an estimate of how many calories your body
will burn in 24 hours if you refrain completely from physical activity.
As you age, your BMR decreases, meaning that it takes fewer calories to
sustain your body. That's why it gets harder and harder to maintain your weight
as you age, unless you change your diet and exercise habits.
Play with the calculator a little bit. See how changing your activity level changes your caloric needs.