CalcOS

BMR Calculator

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Parameters
Use consistent units — imperial (lbs) or metric (kg).
70
20400
Metabolic rate changes significantly with age.
30
15100
Average adult height: 163cm (women), 177cm (men).
175
50250
Body fat percentage.
20.0%
2.0%80.0%
%
Analytics Dashboard
Basal Metabolic Rate (BMR)
1,649 kcal
BMR EquationMifflin-St Jeor
Weight (Metric equivalency)70.0 kg
Height (Metric equivalency)175.0 cm

Uses the Mifflin-St Jeor equation. General health projection only.

Scientific Interpretation Standard
Educational Interpretation

Basal Metabolic Rate (BMR) represents the daily energy required to maintain basic life-sustaining vital functions (such as breathing, circulation, and cell production) at complete resting state.

Physiological Limitations

Estimation formulas represent statistical population averages and do not isolate muscle composition from body water, hydration, or structure. Do not interpret independently as a health score.

Related Assessments
Calorie CalculatorMacronutrient CalculatorWater Intake
Mathematical Explanation
BMR=10W+6.25H−5A+5\text{BMR} = 10W + 6.25H - 5A + 5

Basal Metabolic Rate calculates the caloric threshold required to sustain metabolic functions at complete rest. Calculated using the Mifflin-St Jeor formula. This calculator is provided for educational and informational purposes only. It is not a medical diagnosis or a substitute for professional healthcare advice. Consult a qualified healthcare professional for medical decisions.

How to 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 variables:
  • Gender: Gender
  • Weight: Weight
  • Age (Years): Age (Years)
  • Unit System: Unit System
  • Height (cm): Height (cm)
  • Height (Feet): Height (Feet)
  • Height (Inches): Height (Inches)
  • BMR Formula Preset: BMR Formula Preset
  • Body Fat (%): Body Fat (%)

What Is BMR? Basal Metabolic Rate Calculation & Mifflin Formula

Understand Basal Metabolic Rate, how the Mifflin-St Jeor equation works, and why BMR is the foundation of all calorie calculations.

Read Full Guide →