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Your Basal Metabolic Rate (BMR) is the number of calories your body needs to perform basic, life-sustaining functions while at rest. This includes breathing, circulation, nutrient processing, and cell production. Essentially, it's the amount of energy you would burn if you stayed in bed all day.
Understanding your BMR is the first step toward any fitness goal, whether it's weight loss, muscle gain, or maintenance. Our BMR Calculator uses scientifically backed formulas to give you an accurate estimate of your baseline energy needs.
To get an accurate BMR reading, you'll need to provide:
While BMR is your "at rest" calorie burn, your Total Daily Energy Expenditure (TDEE) is the total number of calories you burn in a day including physical activity.
To lose weight, you should consume fewer calories than your TDEE. To gain weight, you should consume more.
The Mifflin-St Jeor formula is generally considered the most accurate for the average person in modern times. The Harris-Benedict formula was revised in 1984 but may still overestimate calories for some individuals.
Yes! The most effective way to increase your BMR is by building lean muscle mass. Muscle tissue is more metabolically active than fat tissue, meaning it burns more calories even when you're sleeping.
They are very similar. Resting Metabolic Rate (RMR) is usually slightly higher than BMR because it's measured under less restrictive conditions, but for most people, the terms are used interchangeably.