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BMR Calculator

Calculate Basal Metabolic Rate (BMR), the number of calories burned at rest.

Enter inputs on the left to see results.
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How to Calculate & Use the BMR Calculator

Discover your body's baseline caloric needs with our free BMR calculator. Your Basal Metabolic Rate (BMR) is the amount of energy (in calories) your body needs to survive at rest, supporting involuntary functions like breathing and circulation. Input your age, gender, weight, and height to compute your BMR using scientifically validated clinical formulas.

Input & Variable Breakdown:

  • Gender: Bounded variable used in the formulas.
  • Age (Years): Bounded variable used in the formulas.
  • Unit System: Bounded variable used in the formulas.
  • Weight: Bounded variable used in the formulas.
  • Height (cm): Bounded variable used in the formulas.
  • Height (Feet): Bounded variable used in the formulas.
  • Height (Inches): Bounded variable used in the formulas.

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Frequently Asked Questions

What is the Mifflin-St Jeor formula for BMR?

For Men: BMR = 10 * weight (kg) + 6.25 * height (cm) - 5 * age (y) + 5. For Women: BMR = 10 * weight (kg) + 6.25 * height (cm) - 5 * age (y) - 161.

How does BMR change with age?

BMR generally decreases as you age. This decline is primarily due to the natural loss of lean muscle mass (sarcopenia) and changes in metabolic activity.

What is the difference between BMR and TDEE?

BMR is the energy expended while at complete rest. Total Daily Energy Expenditure (TDEE) represents the total number of calories you burn in a day, calculated by multiplying your BMR by an activity factor.