Result

Harris-Benedict BMR: - kcal/day

Mifflin-St Jeor BMR: - kcal/day

Maintenance Calories: - kcal/day

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Tips:

For optimal health, ensure you maintain a balanced diet and exercise regularly.

Understanding Basal Metabolic Rate (BMR)

Understanding your body’s calorie requirements is essential for maintaining, losing, or gaining weight. One of the best tools for this purpose is the BMR Calculator.

What is BMR?

Basal Metabolic Rate (BMR) is the number of calories your body needs to perform basic life-sustaining functions such as breathing, circulating blood, and regulating temperature while at rest. It does not include calories burned through physical activity or digestion.

Why is BMR Important?

Helps plan your daily caloric intake.
Supports fitness goals like weight loss or muscle gain.
Provides insights into how your metabolism affects your body.

BMR Formulas

Two widely used equations are Harris-Benedict and Mifflin-St Jeor.

1. Harris-Benedict Equation

Men: BMR = 66 + (13.7 × weight in kg) + (5 × height in cm) − (6.8 × age in years)
Women: BMR = 655 + (9.6 × weight in kg) + (1.8 × height in cm) − (4.7 × age in years)

2. Mifflin-St Jeor Equation

Men: BMR = 10 × weight + 6.25 × height − 5 × age + 5
Women: BMR = 10 × weight + 6.25 × height − 5 × age − 161

Factors Affecting BMR

Age: Decreases with age due to muscle loss and hormonal changes.
Gender: Men usually have a higher BMR than women.
Weight & Height: Taller and heavier individuals have higher BMRs.
Body Composition: Muscle burns more calories than fat.
Health Conditions: Thyroid disorders can affect BMR.

Parameters for BMR Calculation

Parameter	Units	Input Needed
Weight	Kilograms	Your current weight
Height	Centimeters	Your height
Age	Years	Your age
Gender	Male/Female	Specify gender

BMR Chart for Quick Reference

Age Group	BMR for Men (kcal/day)	BMR for Women (kcal/day)
18-30 years	1800 - 2500	1500 - 2200
31-50 years	1700 - 2400	1400 - 2100
51+ years	1600 - 2300	1300 - 2000