BMR Calculator
Your BMR is the minimum calories your body needs to survive. It's the starting point for calculating your full daily calorie needs.
Enables a third formula that accounts for your lean muscle mass directly.
What Is Basal Metabolic Rate?
Your Basal Metabolic Rate (BMR) represents the energy your body expends at complete rest to maintain essential physiological functions. This includes maintaining body temperature, circulating blood, breathing, and keeping every cell in your body alive.
BMR typically accounts for 60–75% of your total daily calorie burn, making it the most important factor in your overall energy equation.
BMR Formulas
Mifflin-St Jeor (Default)
Male: (10 × kg) + (6.25 × cm) − (5 × age) + 5
Female: (10 × kg) + (6.25 × cm) − (5 × age) − 161
Katch-McArdle (If you know body fat %)
BMR = 370 + (21.6 × lean mass in kg)
More accurate if you have a body composition measurement.
Frequently Asked Questions
What is BMR?
BMR (Basal Metabolic Rate) is the number of calories your body needs to perform basic life-sustaining functions at complete rest — breathing, circulation, cell production, and organ function.
What's the difference between BMR and TDEE?
BMR is your resting calorie burn only. TDEE (Total Daily Energy Expenditure) is BMR multiplied by an activity factor to account for movement and exercise.
Which BMR formula is most accurate?
The Mifflin-St Jeor equation is considered the most accurate for most people. The Katch-McArdle formula is more accurate if you know your body fat percentage, as it accounts for lean mass directly.
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Disclaimer: Results are estimates based on population averages and established equations. Individual results may vary. Always consult a registered dietitian or healthcare professional before making significant dietary changes.