1. What is BMR?

Basal Metabolic Rate (BMR) is the number of calories your body needs to maintain basic physiological functions at rest. This most accurate formula calculates BMR based on lean body mass rather than total body weight.

2. How Does the Calculator Work?

The calculator uses the most accurate BMR equation:

Where:

• \( weight \) — Body weight in kilograms
• \( body\_fat \) — Body fat percentage

Explanation: The equation calculates BMR based on lean body mass, which provides a more accurate estimate than formulas using total body weight alone.

3. Importance of Accurate BMR Calculation

Details: Knowing your precise BMR is essential for creating effective nutrition plans, whether for weight loss, maintenance, or muscle gain. This formula is particularly accurate for athletes and individuals with varying body compositions.

4. Using the Calculator

Tips: Enter your weight in kilograms and body fat percentage. For best results, use a recent body composition analysis. All values must be valid (weight > 0, body fat between 0-100%).

5. Frequently Asked Questions (FAQ)

Q1: Why is this formula more accurate than others?
A: It accounts for body composition (fat vs. lean mass) rather than just total weight, as muscle tissue burns more calories than fat tissue.

Q2: How often should I recalculate my BMR?
A: Recalculate whenever your weight or body composition changes significantly (typically every 4-8 weeks during body recomposition).

Q3: Where can I get my body fat percentage measured?
A: Options include DEXA scans, BodPod, skinfold calipers, or bioelectrical impedance scales (though accuracy varies by method).

Q4: Does this account for activity level?
A: No, this is just your basal metabolic rate. Multiply by an activity factor to get total daily energy expenditure (TDEE).

Q5: How does age affect BMR?
A: While age isn't in this formula, it's accounted for indirectly since body composition typically changes with age (more fat, less muscle).