Your Basal Metabolic Rate (BMR) is the energy your body uses at complete rest to keep vital functions running. We use the Mifflin-St Jeor equation, the most accurate common BMR formula.
Sample input: Weight (kg): 70, Height (cm): 175, Age (years): 30, Sex (1 = male, 0 = female): 1
Your BMR: 1649 (Calories burned at rest)
At complete rest, your body burns about 1649 calories per day to keep its basic functions running (calculated for a male using the Mifflin-St Jeor equation).
BMR is your Basal Metabolic Rate: the calories your body burns at complete rest to maintain functions like breathing, circulation, and cell production. It is the largest part of daily calorie use for most people.
It uses the Mifflin-St Jeor equation (1990), which research has shown to be more accurate for most adults than the older Harris-Benedict equation.
BMR is calories burned at rest. TDEE is BMR multiplied by an activity factor and represents total daily calories burned including movement and exercise.
The Mifflin-St Jeor equation adds 5 for males and subtracts 161 for females, reflecting average differences in lean body mass that affect resting energy use.