Basal metabolic rate (BMR) is the amount of energy expended while at rest. Use this calculator to find out your BMR, determine your caloric needs, and lose or gain weight.
Everybody requires a minimum number of calories to live. This minimum number is called the basal metabolic rate (BMR). Your BMR is the number of calories your organs need to function while you perform no activity whatsoever. You can think of it as the amount of energy you’d burn if you stayed in bed all day.
Since your basal metabolic rate is based largely on involuntary functions like breathing and pumping blood, changes in your day-to-day activity don’t do much to raise or lower this number. However, increasing muscle mass does increase BMR, because muscle is metabolically “hungry” and it takes more energy to maintain more muscle. This means that when you have a lot of muscle mass, you’ll burn more calories at rest.
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