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.

BMR Calculator

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

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Parameters

R Reset

Gender

WeightUse consistent units — imperial (lbs) or metric (kg).

20400

Age (Years)Metabolic rate changes significantly with age.

15100

Height (cm)Average adult height: 163cm (women), 177cm (men).

175

50250

Unit System

BMR Formula Preset

Body Fat (%)Body fat percentage.

20.0%

2.0%80.0%

Analytics Dashboard

Basal Metabolic Rate (BMR)

1,649 kcal

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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

\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: Bounded parameter in the mathematical model.
Weight: Bounded parameter in the mathematical model.
Age (Years): Bounded parameter in the mathematical model.
Unit System: Bounded parameter in the mathematical model.
Height (cm): Bounded parameter in the mathematical model.
Height (Feet): Bounded parameter in the mathematical model.
Height (Inches): Bounded parameter in the mathematical model.
BMR Formula Preset: Bounded parameter in the mathematical model.
Body Fat (%): Bounded parameter in the mathematical model.

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.

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