🔥 BMR Calculator

What is Basal Metabolic Rate?

Your Basal Metabolic Rate (BMR) is the number of calories your body needs to perform basic life-sustaining functions like breathing, circulation, cell production, and nutrient processing. It represents the minimum energy your body requires while at complete rest — essentially the calories you'd burn if you stayed in bed all day.

Mifflin-St Jeor vs Harris-Benedict

The Mifflin-St Jeor equation (1990) is considered the most accurate for most people. The Harris-Benedict equation (1919, revised 1984) is older but still widely used. Both provide good estimates, and the average of the two can give you a reliable baseline.

BMR accounts for about 60-75% of your total daily calorie burn. The rest comes from physical activity (15-30%) and the thermic effect of food (about 10%).