BMR Calculator

BMR Equations:

Men: BMR = 10 × weight + 6.25 × height - 5 × age + 5

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

Weight:

Height:

Age:

years

Gender:

Basal Metabolic Rate (BMR):

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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 at rest. This includes breathing, circulation, cell production, and nutrient processing. It represents the minimum energy required to keep your body functioning.

2. How Does the Calculator Work?

The calculator uses the Mifflin-St Jeor equations:

For Men: BMR = 10 × weight + 6.25 × height - 5 × age + 5

For Women: BMR = 10 × weight + 6.25 × height - 5 × age - 161

Where:

weight — Body weight in kilograms (kg)
height — Height in centimeters (cm)
age — Age in years
+5 — Additional calories for men
-161 — Adjustment for women

Accuracy: This equation is generally accurate within ±10% for most individuals.

3. Importance of BMR Calculation

Details: Knowing your BMR is essential for weight management, creating effective diet plans, and understanding your body's energy requirements. It forms the foundation for calculating Total Daily Energy Expenditure (TDEE).

4. Using the Calculator

Tips: Enter your weight in kilograms, height in centimeters, age in years, and select your gender. For accurate results, use recent measurements and ensure all values are valid.

5. Frequently Asked Questions (FAQ)

Q1: Is a BMR calculator accurate?
A: The Mifflin-St Jeor equation used in this calculator is generally accurate within ±10% for most healthy adults, making it one of the most reliable BMR estimation methods.

Q2: What factors affect BMR?
A: BMR is influenced by age, gender, weight, height, body composition, genetics, and hormonal factors. Muscle mass significantly increases BMR.

Q3: How often should I recalculate my BMR?
A: Recalculate every 3-6 months or after significant weight changes (±5kg) to ensure accuracy for your current metabolic needs.

Q4: Can BMR change over time?
A: Yes, BMR typically decreases with age (about 1-2% per decade after age 20) and can be affected by lifestyle changes, diet, and exercise habits.

Q5: How does BMR relate to weight loss?
A: Understanding your BMR helps create a calorie deficit for weight loss. A deficit of 500-1000 calories per day from your TDEE (BMR + activity) typically results in safe weight loss of 0.5-1kg per week.