BMR Calculator

Mifflin-St Jeor Equation:

For Men: BMR = 10 × weight (kg) + 6.25 × height (cm) - 5 × age (years) + 5
For Women: BMR = 10 × weight (kg) + 6.25 × height (cm) - 5 × age (years) - 161

Weight:

Height:

Age:

years

Gender:

Basal Metabolic Rate (BMR):

Unit Converter ▲

Unit Converter ▼

From:	To:

1. What Is Basal Metabolic Rate (BMR)?

Basal Metabolic Rate (BMR) is the number of calories your body needs to perform basic life-sustaining functions while at complete rest. This includes breathing, circulation, cell production, and nutrient processing.

2. How Does The Calculator Work?

The calculator uses the Mifflin-St Jeor equation:

For Men: BMR = 10 × weight (kg) + 6.25 × height (cm) - 5 × age (years) + 5
For Women: BMR = 10 × weight (kg) + 6.25 × height (cm) - 5 × age (years) - 161

Where:

Weight — Body weight in kilograms (kg)
Height — Height in centimeters (cm)
Age — Age in years
Gender — Biological sex (male/female)

Explanation: The Mifflin-St Jeor equation is currently considered the most accurate formula for calculating BMR in healthy individuals.

3. Importance Of BMR Calculation

Details: Knowing your BMR is essential for weight management, as it helps determine your daily caloric needs. It serves as the foundation for calculating your Total Daily Energy Expenditure (TDEE) when combined with your activity level.

4. Using The Calculator

Tips: Enter your weight in kilograms, height in centimeters, age in years, and select your gender. For accurate results, use precise measurements and fast for at least 12 hours before calculation for clinical accuracy.

5. Frequently Asked Questions (FAQ)

Q1: How accurate is the Mifflin-St Jeor equation?
A: The Mifflin-St Jeor equation is considered the most accurate BMR formula for the general population, with an accuracy rate of about 90%.

Q2: What factors can affect my BMR?
A: BMR is influenced by body composition (muscle mass), age, gender, genetics, hormone levels, and environmental temperature.

Q3: How often does BMR change?
A: BMR decreases with age (about 1-2% per decade after age 20) and can change with significant weight loss or gain, and changes in muscle mass.

Q4: Can I increase my BMR?
A: Yes, through regular exercise (especially strength training), building muscle mass, and proper nutrition can help increase your BMR.

Q5: How does BMR relate to weight loss?
A: Knowing your BMR helps create an appropriate calorie deficit for weight loss. A deficit of 500-1000 calories per day from your TDEE typically results in 0.5-1 kg weight loss per week.