BMR Calculator
Free BMR calculator. Enter your age, sex, height, and weight in metric or imperial units to estimate your Basal Metabolic Rate using the Mifflin-St Jeor equation.
Your Basal Metabolic Rate (BMR) is the number of calories your body burns at complete rest just to keep essential functions running — breathing, circulation, and cell repair. This calculator uses the widely trusted Mifflin-St Jeor equation and works in both metric and imperial units, updating live as you enter your age, sex, height, and weight.
BMR is the foundation for working out total daily calorie needs: multiply it by an activity factor to estimate how much you burn across a full day. These figures are estimates for general information only and are not medical advice — consult a qualified professional for guidance tailored to you.
Frequently asked questions
What is the difference between BMR and TDEE?
BMR is the calories you burn at rest, while TDEE adds the calories burned through daily movement and exercise. TDEE equals BMR multiplied by an activity factor.
Which formula does this calculator use?
It uses the Mifflin-St Jeor equation, which is considered one of the most accurate predictive BMR formulas for the general population.
Can I lose weight by eating below my BMR?
Eating below your BMR for long periods is generally not recommended. Weight management is usually based on your TDEE, not your BMR. Speak to a professional before making changes.
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